Rosemount 2120 Level Switch: Vibrating Fork

Reference Manual
00809-0100-4030, Rev FA
December 2016
Rosemount™ 2120 Level Switch

Vibrating Fork
Reference Manual Contents
00809-0100-4030, Rev FA December 2016
Contents
1Section 1: Introduction
1.1 Using this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Models covered . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Level switch overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3.1 Features list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3.2 Measurement principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3.3 Short fork technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3.4 Special features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Product recycling and disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2Section 2: Installation
2.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Considerations before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.1 Safety considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.2 Environmental considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2.3 Application considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.4 Installation considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.5 Installation recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.6 Installation examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.3 Installation procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3.1 Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3.2 Correct fork alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.3 Tightening the threaded level switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.3.4 Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4 Setting the mode switch and switching time delay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.5 LED indication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.6 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.6.1 Direct load switching electronics cassette. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.6.2 PNP/PLC electronics cassette . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2.6.3 Relay output electronics cassette (standard version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2.6.4 Relay output electronics cassette (12 Vdc nominal version) . . . . . . . . . . . . . . . . . . . . . . 24
2.6.5 NAMUR electronics cassette . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.6.6 8/16 mA electronics cassette . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Contents i
Contents Reference Manual
December 2016 00809-0100-4030, Rev FA
3Section 3: Service and Troubleshooting

3.1 Safety messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2 Magnetic test point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.3 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.5 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.6 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.7 Service support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.8 Replacement and calibration of electronic cassettes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.8.1 Replacement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.8.2 Calibration sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4Appendix A: Specifications and Reference Data

A.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
A.1.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
A.1.2 Mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
A.1.3 Functional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
A.1.4 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
A.1.5 Electrical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
A.2 Dimensional drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
A.3 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
A.3.1 Spare parts and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5Appendix B: Product Certifications

B.1 European directive information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.2 Hygienic approvals & compliances (surface finish codes 3, 4, 7, and 8) . . . . . . . . . . . . . . . . . . 51
B.3 Overfill approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.4 Marine approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.5 Drinking water approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.6 NAMUR approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.7 Ordinary location certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.8 Canadian Registration Number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.9 Safety Integrity Level (SIL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
B.10 Hazardous locations certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
B.10.1 American and Canadian approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
B.10.2 European approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
B.10.3 International approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
B.11Hygienic installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
ii Contents
Reference Manual Title Page
00809-0100-4030, Rev FA December 2016
Rosemount™ 2120 Level Switch

Vibrating Fork
NOTICE
Read this manual before working with the product. For personal and system safety, and for optimum
product performance, make sure you thoroughly understand the contents before installing, using, or
maintaining this product.
For technical assistance, contacts are listed below:
Customer Central
Technical support, quoting, and order-related questions.
Americas 1 800 999 9307
Europe +41 (0) 41 768 6111
Middle east +971 4 811 8100
Asia +65 6777 8211
North American Response Center
Equipment service needs.
1-800-654-7768 (24 hours — includes Canada)
Outside of these areas, contact your local Emerson™ representative.
The products described in this document are NOT designed for nuclear-qualified applications.
Using non-nuclear qualified products in applications that require nuclear-qualified hardware or
products may cause inaccurate readings.
For information on Rosemount nuclear-qualified products, contact your local Emerson sales
representative.
Title Page v
Title Page Reference Manual
December 2016 00809-0100-4030, Rev FA
Failure to follow these installation guidelines could result in death or serious injury.
 Make sure only qualified personnel perform the installation.
 Use the Rosemount 2120 Level Switch (“level switch”) only as specified in this manual.
Failure to do so may impair the protection provided by the equipment.
 The weight of the level switch with a heavy flange and extended fork length may exceed
37 lb. (18 kg). A risk assessment is required to be done before carrying, lifting, and installing
the level switch.
Explosions could result in death or serious injury.
 Do not remove the level switch cover in explosive atmospheres when the circuit is alive.
 The level switch cover must be fully engaged and locked to meet explosion-proof
requirements.
 Verify the operating environment of the level switch is consistent with the appropriate
hazardous locations certifications.
 Review Appendix B: Product Certifications for special conditions and safety instructions
associated with a hazardous location installation.
Electrical shock can result in death or serious injury.

 If the level switch is installed in a high-voltage environment and a fault or installation error
occurs, high voltage may be present on the sensor leads and terminals.
 Use extreme caution when making contact with the leads and terminals.
 Make sure the main power to the level switch is off and the lines to any other external power
source are disconnected or not powered while wiring the level switch.
 Ensure the wiring is suitable for the electrical current and the insulation is suitable for the
voltage, temperature, and environment.
External surfaces may be hot.
 Care must be taken to avoid possible burns. The flange and process seal may also be hot at
high process temperatures. Allow to cool before servicing.
Process leaks could result in death or serious injury.
 Install and tighten process connection before applying pressure.
 Do not attempt to loosen the process connection while the level switch is in service.
 Make sure that the level switch is handled carefully. If the process seal is damaged, gas might
escape from the tank.
Any substitution of non-recognized parts may jeopardize safety and is under no

circumstances allowed.
 Unauthorized changes to the product are strictly prohibited as they may unintentionally and
unpredictably alter performance and jeopardize safety.
 Unauthorized changes that interfere with the integrity of the welds or flanges, such as
making additional perforations, compromise product integrity and safety. Equipment
ratings and certifications are no longer valid on any products that have been damaged or
modified without the prior written permission of Emerson. Any continued use of product
that has been damaged or modified without the written authorization is at the customer’s
sole risk and expense.
vi Title Page
Reference Manual Introduction
00809-0100-4030, Rev FA December 2016
Section 1 Introduction
1.1 Using this manual

The sections in this manual provide information on installing, operating, and maintaining the
Rosemount™ 2120 Level Switch – Vibrating Fork. The sections are organized as follows:
 Section 2: Installation contains mechanical and electrical installation instructions.

 Section 3: Service and Troubleshooting covers basic maintenance guidelines and troubleshooting
techniques for the most common operating problems.
 Appendix A: Specifications and Reference Data supplies reference and specification data as well as
ordering information.
 Appendix B: Product Certifications contains safety approval information and approval drawings.
1.2 Models covered

All models of the Rosemount 2120 Level Switch (“level switch”) are covered in this manual.
1.3 Level switch overview

1.3.1 Features list
 Designed for use in process temperatures of –40 to 302 °F (–40 to 150 °C)
 Based on vibrating short fork technology, the level switch is suitable for many liquid applications
 Virtually unaffected by flow, bubbles, turbulence, foam, vibration, solids content, coating products,
liquid properties, and product variations
 A ‘heartbeat’ LED indicates its operating state. The LED also flashes when the switch output is ‘off’ and
is constantly lit when 'on'
 ‘Fast drip’ fork design gives quicker response time, especially with viscous liquids. Rapid wet-to-dry
and dry-to-wet time setting for highly responsive switching
 Adjustable switching delay prevents false switching in turbulent or splashing applications
 Fork shape is optimized for polishing to meet hygienic requirements. There are mechanical- and
electro-polishing options
 Magnetic test-point for easy functional test
 No moving parts or crevices for virtually no maintenance
 No need for calibration and requires minimum installation procedures
 Easy terminal access and electrical protections (see page 37)
 Short fork length with extensions up to 157.5 in. (4 m)
 General area, explosion-proof/flameproof and intrinsically safe options
 Tri Clamp process connections are available as hygienically certified to 3-A® and EHDEG,
and compliant with FDA and ASME-BPE
This combination of features makes the Rosemount 2120 Level Switch an ideal choice for a wide variety
of challenging applications in the chemical, power generation, and oil and gas industries.
Introduction 1
Introduction Reference Manual
December 2016 00809-0100-4030, Rev FA
Figure 1-1. Rosemount 2120 Application Examples

t.com
Switch
www.rosemoun
Level
Fork
Vibrating
2120
Overfill protection
Spillage caused by overfilling can be hazardous to people and the environment, resulting in lost product
and potentially high clean up costs.
High and low level alarm

Maximum and minimum level detection in tanks containing different types of liquids are ideal
applications. The Rosemount 2120 Level Switch is robust and operates continuously across the process
2120
Vibrating
www.rosemoun
Fork
Level
Switch
t.com
temperature range of –40 to 302 °F (–40 to 150 °C) and operating pressures of up to 1450 psig (100
barg), making it perfect for use as a high or low level alarm. It is common practice to have an independent
2120
high level alarm switch as a backup to an installed level device in case of primary failure.
Vibrating
www.rosemoun
Fork
Level
Switch
t.com
Pump control (limit detection)

Batch processing tanks often contain stirrers and agitators to ensure mixing and product ‘fluidity’. The
www.rosemoun
2120
t.com Vibrating
Fork
Level
Switch
standard user selectable time delay, from 0.3 to 30 seconds, virtually eliminates the risk of false switching
from splashing.
2120
Vibrating
www.rosemoun
Fork
Level
Switch
t.com
Pump protection or empty pipe detection

With the fork projecting only 2 in. (50 mm) (dependent on connection type), the Rosemount 2120 can
be installed in small diameter pipes. Short forks mean minimum intrusion on the wetside and allow for
simple, low cost installation at any angle into pipes or tanks. By selecting the option of direct load
switching or relay electronics, the Rosemount 2120 is ideal for reliable pump control and can be used to
protect against pumps running dry.
www.rosemount.
2120
Vibrating
com
Fork
Level
Switch
Wireless applications
The advent of wireless communications allows process plant managers to save up to 90% on installation
cost compared with wired technologies. More data can be collected at central locations than has ever
been possible before. The Rosemount 2120 can be used with a Rosemount 702 Wireless Discrete
Transmitter to enable these benefits for your applications.
Hygienic applications
www.rosemoun
With the highly polished forks option providing a surface finish (Ra) better than 0.4 μm, the Rosemount
2120
t.com Vibrating
Fork
Level
Switch
2120 meets the most stringent hygienic requirements used in food and beverage, and pharmaceutical
applications. The Rosemount 2120 is robust enough to easily withstand CIP (Clean-In- Place) and SIP
(Steam-In-Place) cleaning routines.
2 Introduction
Reference Manual Introduction
00809-0100-4030, Rev FA December 2016
1.3.2 Measurement principle

The level switch is designed using the principle of a tuning fork. A piezo-electric crystal oscillates the
forks at their natural frequency. Changes to this frequency are continuously monitored. The frequency of
the vibrating fork sensor changes depending on the medium in which it is immersed. The denser the
liquid, the lower the frequency.
When used as a low level alarm, the liquid in the tank or pipe drains down past the fork, causing a
change of natural frequency that is detected by the electronics and switches the output state.
When the level switch is used as a high level alarm, the liquid rises in the tank or pipe making contact
with the fork and causing the output state to switch.
1.3.3 Short fork technology

The natural frequency (~1400 Hz) of the fork avoids interference from plant vibration that may cause
false switching. This allows for minimum intrusion into the tank or pipe through the use of a short fork.
Using short fork technology, the Rosemount 2120 Level Switch can be used in almost all liquid
applications. Extensive research has maximized the operational effectiveness of the fork design, making
it suitable for most liquids including coating liquids, aerated liquids, and slurries.
Figure 1-2. Rosemount 2120 Features

A
B
J C
I
E
H F
A. Visible heartbeat LED G. Wetted material in 316/316L SST, solid Alloy C and Alloy C-276,
B. Mode switch, adjustable time delay or ECTFE-coated 316/316L SST
C. Housings in glass-filled nylon, aluminum, or 316 SST H. Short fork length or extensions up to 157.5-in. (4 m)
D. Magnetic test point I. Two cable/ conduit entries
E. Threaded, flanged, or Tri Clamp connections J. Direct Load, Relay DPCO, PLC/PNP, NAMUR,
F. ‘Fast drip’ fork design or 8/16 mA electronics
Introduction 3
Introduction Reference Manual
December 2016 00809-0100-4030, Rev FA
1.3.4 Special features

Heartbeat LED
The Rosemount 2120 Level Switch has a ‘heartbeat’ LED indicating its status, which can be seen at all
times and from all angles through a lens in the cover of non-metal housings. The LED flashes when the
switch output is ‘off’ and is constantly lit when 'on'.
Fork design
The “fast drip” fork design draws liquid away from the fork tips when mounted horizontally, and together
with a short switching delay, allows the Rosemount 2120 Level Switch to react quickly and with greater
sensitivity to density variations.
Mode switch and adjustable time delay

A mode switch allows the Rosemount 2120 to be set to switch from wet to dry (typically for low level
alarm) or from dry to wet (typically for high level alarm). There is also a user-selectable time delay (0.3, 1,
3, 10, or 30 s) to virtually eliminate the risk of false switching in turbulent or splashing applications.
Magnetic test point

A magnetic test-point is located on the side of the housing, allowing the user to perform a functional test
of the Rosemount 2120 and the system connected to it. Holding a magnet to the test-point causes the
output to change state.
Electrical hookup
The terminal blocks extend above the housing and give easy terminal access. Electrical protections
(see page 37) make electrical hook-up safe and easy.
1.4 Product recycling and disposal

Recycling of equipment and packaging should be taken into consideration. The product and packaging
should be disposed of in accordance with local and national legislation.
4 Introduction
Reference Manual Installation
00809-0100-4030, Rev FA December 2016
Section 2 Installation
Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

Considerations before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6
Installation procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 14
Setting the mode switch and switching time delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 18
LED indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 19
Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 20
2.1 Safety messages

Procedures and instructions in this manual may require special precautions to ensure the safety of the
personnel performing the operations. Information that raises potential safety issues is indicated by a
caution symbol ( ). The external hot surface symbol ( ) is used when a surface is hot and care must be
taken to avoid possible burns. If there is a risk of an electrical shock, the ( ) symbol is used. Refer to the
safety messages listed at the beginning of each section before performing an operation preceded by this
symbol.
37 lb. (18 kg). A risk assessment is required to be done before carrying, lifting, and installing the
level switch.
 The level switch cover must be fully engaged and locked to meet explosion-proof requirements.
 Verify the operating environment of the level switch is consistent with the appropriate hazardous
locations certifications.
 If the level switch is installed in a high-voltage environment and a fault or installation error occurs,
high voltage may be present on the sensor leads and terminals.
 Make sure the main power to the level switch is off and the lines to any other external power
source are disconnected or not powered while wiring the level switch.
 Ensure the wiring is suitable for the electrical current and the insulation is suitable for the voltage,
temperature, and environment.
Installation 5
Installation Reference Manual
December 2016 00809-0100-4030, Rev FA

 Care must be taken to avoid possible burns. The flange and process seal may also be hot at high
process temperatures. Allow to cool before servicing.
 Make sure that the level switch is handled carefully. If the process seal is damaged, gas might escape
from the tank.
2.2 Considerations before installation

Important
Emerson is not in a position to evaluate or guarantee the compatibility of the process fluid or other
process parameters with the product, options, configuration or materials of construction selected.
2.2.1 Safety considerations

Safety instructions and control drawings specific to hazardous area installations are in
Appendix B: Product Certifications, and there are safety instructions in the Rosemount 2120 Quick Start
Guide (see Emerson.com/Rosemount for other language versions). These safety instructions also include
general safety information.
2.2.2 Environmental considerations

The Rosemount 2120 Level Switch (“level switch”) is available as Intrinsically Safe (IS) or
explosion-proof/flameproof versions for hazardous area installations. There are also ordinary location
versions for unclassified, safe areas. Approvals are listed in Appendix B: Product Certifications.
This level switch is designed for detecting liquids in open or closed tank, and pipe installations.
It is weatherproof and protected against the ingress of dust, but must be protected from flooding.
Avoid installing the level switch near heat sources.
Figure 2-1. Environmental Considerations
OK OK
6 Installation
00809-0100-4030, Rev FA December 2016
2.2.3 Application considerations

For most liquids, including coating, aerated liquids and slurries, the function is virtually unaffected by
flow, turbulence, bubbles, foam, vibration, solid particles, build-up, or properties of the liquid.
The level switch operates in process temperatures of –40 to 302 °F (–40 to 150 °C), and can be mounted
in an open or closed tank, or a pipe. There is a wide range of threaded, flanged, and hygienic process
connection options. See Figure 1-1 on page 2 for application examples.
Important
There must be no risk of ‘bridging’ the forks (see Figure 2-2). Examples of media that can create
‘bridging’ of forks are dense paper slurries and bitumen.
Figure 2-2. Avoid Product Build-up
OK
Application guidelines
 Ensure the process is operating within the level switch operating temperature and pressure ranges
(see “Specifications” on page 35).
 Ensure the liquid viscosity is within the recommended range (see “Specifications” on page 35).
 Check that the liquid density is higher than 37.5 lb/ft3 (600 kg/m3) (see “Specifications” on page 35).
 Liquid density affects the switchpoint e.g. dry-to-wet (see Figure 2-3 on page 8).
 Check for risk of coating build-up on the forks.
Avoid situations where drying and coating products may create excessive build-up. Problems may
occur if the product coats and then dries, causing caking.
 Check the solids content in the liquid.
As a guideline, the maximum solid particle diameter in the liquid is 0.2 in. (5 mm).
Extra consideration is needed when dealing with particles bigger than 0.2 in. (5 mm).
Consult the factory for advice.
 In almost all cases, the level switch is insensitive to foams (i.e. does not see the foam).
However in rare occasions, some very dense foams may be seen as liquid; known examples of this are
found in ice-cream and orange juice manufacturing.
Installation 7
December 2016 00809-0100-4030, Rev FA
Figure 2-3. Switching Points
0.1 in.
(2.5 mm)
SP HY
0.5 in.
(13 mm)
0.5 in.
(13 mm)
SP
SP: Switching point (H20)

HY: Switching Hysteresis
Note
When mounted vertically, a low density media has a switching point closer to the process connection.
A high density media has a switching point closer to fork tip.
2.2.4 Installation considerations

For dimensional drawings, see “Dimensional drawings” on page 39.
Device identification
To identify the Rosemount 2120 Level Switch version, see the labels on the housing and on the
electronics cassette inside the housing. See Appendix B: Product Certifications for approval information.
Allow adequate space outside tank or pipe

Mount the level switch so that it is removable. Clearance of 1.2 in. (30 mm) is required for cover removal.
Ensure there is sufficient room for electrical connections. The glass-filled nylon housing can be rotated to
assist with the cabling, but the metal housings cannot be rotated.
Fit the cover correctly

Ensure the housing O-ring is sitting evenly and then tighten the housing cover to form a good seal.
Always use Emerson O-rings.
8 Installation
00809-0100-4030, Rev FA December 2016
Grounding on metal housings

Always ground the housing in accordance with national and local electrical codes.
The most effective grounding method for the metal housing is a direct connection to earth ground with
minimal impedance. Housings with NPT conduit entries do not have an earth ground point and must use
the fork earth.
Do not change the level switch

Do not change the level switch fork in any way (Figure 2-4).
Figure 2-4. Do Not Change the Level Switch Fork
How to handle the level switch

Handle the level switch with great care.
The weight of the level switch with a heavy flange and extended fork length may exceed 37 lb. (18 kg).
A risk assessment is required to be done before carrying, lifting, and installing the level switch.
Use both hands to carry the extended length versions, and do not hold using the forks (Figure 2-5 on
page 10). For hygienic applications, the level switch must be hygienically cleaned before installation and
handled in strict accordance with hygienic standards.
Hygienic installation
See “Hygienic installations” on page 62 for the hygienic approvals and compliance requirements.
These requirements are also in the Rosemount 2120 Quick Start Guide (seeEmerson.com/Rosemount
for other language versions).
Installation 9
December 2016 00809-0100-4030, Rev FA
Figure 2-5. Handling the Rosemount 2120
OK OK
2.2.5 Installation recommendations

 Test the system by using the magnetic test-point (see “Magnetic test point” on page 28).
 Avoid installing near to liquid entering the tank at the fill point.
 Avoid heavy splashing on the forks. Increasing the time delay reduces accidental switching.
 Allow for a sufficient distance between product build-up and fork (see Figure 2.2.4 on page 8).
 Ensure the installation does not create tank crevices around the forks where liquid may collect.
This can happen with high viscosity and high density liquids.
 Extra consideration is needed if the plant vibration is close to the 1400 Hz operating frequency
of the level switch.
 Supporting the extended fork avoids long fork length vibration
(see Figure 2-6 on page 11 or Figure 2-7 on page 12, depending on installation).
10 Installation
00809-0100-4030, Rev FA December 2016
Figure 2-6. Required Supports for Extended Fork (Standard)
Maximum
3.28 ft.
(1.0 m)
3.28 ft.
OK OK
(1.0 m)
3.28 ft.
(1.0 m)
Maximum
3.28 ft.
(1.0 m)
OK
3.28 ft. 3.28 ft.
(1.0 m) (1.0 m)
OK
Installation 11
December 2016 00809-0100-4030, Rev FA
Figure 2-7. Required Supports for Extended Forks (Marine GL Approval)
Maximum
1.3 ft.
(0.4 m)
2.3 ft.
(0.7 m)
OK 2.3 ft.
(0.7 m)
OK
2.3 ft.
(0.7 m)
0.65 ft.
(0.2 m)
Maximum
1.3 ft.
(0.4 m)
OK
0.65 ft.
(0.2 m)
2.3 ft. 2.3 ft. 2.3 ft.
(0.7 m)
OK
(0.7 m) (0.7 m)
12 Installation
00809-0100-4030, Rev FA December 2016
2.2.6 Installation examples

Figure 2-8. High and Low Level Alarms
A B
A B
A. Dry
B. Wet
Figure 2-9. Pump Control or Overfill Protection

B A A
B B A
A. Dry
B. Wet
Figure 2-10. Pump or Empty Pipe Protection
B B
A A
A. Dry
B. Wet
Installation 13
December 2016 00809-0100-4030, Rev FA
2.3 Installation procedures

2.3.1 Mechanical
Sealing
Figure 2-11. Sealing
A
C
B D
A. PTFE
B. NPT or BSPT (R) thread
C. Gasket
D. BSPP (G) thread
E. Tri Clamp
F. The Tri Clamp seal is supplied as an as accessory kit (see “Spare parts and accessories” on page 50)
14 Installation
00809-0100-4030, Rev FA December 2016
2.3.2 Correct fork alignment

Ensure the fork is correctly aligned by using the notches and grooves as indicated in Figure 2-12.
Figure 2-12. Correct Fork Alignment

A
B
C
A. Alignment groove on standard length Rosemount 2120

B. Alignment notch on flanged Rosemount 2120
C. Alignment notch on extended length Rosemount 2120
Pipe installation
Figure 2-13. Pipe Installation
OK
Note
The glass-filled nylon housing of a Rosemount 2120 can be rotated to assist with cabling, but the metal
housing cannot be rotated.
Installation 15
December 2016 00809-0100-4030, Rev FA
Tank installation
Figure 2-14. Tank Installation
OK OK
OK
OK OK
OK
Note
The glass-filled nylon housing of a Rosemount 2120 can be rotated to assist with cabling, but the metal
housing cannot be rotated.
16 Installation
00809-0100-4030, Rev FA December 2016
2.3.3 Tightening the threaded level switch

Figure 2-15. Tightening the Threaded Rosemount 2120
OK
2.3.4 Insulation
Figure 2-16. Insulation
A A
A. 3.9 in. (100 mm) clearance all around

B. ROCKWOOL®
Installation 17
December 2016 00809-0100-4030, Rev FA
2.4 Setting the mode switch and switching time delay

1. Select “Dry on” or “Wet on” mode.
2. Select 0.3, 1, 3, 10, or 30 seconds for the delay before switching output state.
Note
There is a five second delay when changing mode or time delay. The small cut-out in the rotating switch
indicates time delay and mode.
Recommended installation for high level is “Dry on” (Figure 2-18) and for low level it is “Wet on”
(Figure 2-19). Do not install in the normally ‘off’ state.
Figure 2-17. Top-down View: Example Cassette Inside Housing
A B
OPERATION MODE PLC/PNP

Dry On Mode Dry On Wet On
Dry Isolate Supply
+ OUT -
Wet 0.3 0.3 Before Removing
1 1
3 3
Dry 10 10
Wet 30 30
1 2 3 4 Wet On Mode Seconds Delay
A. LED
B. Mode Switch/Time Delay
Figure 2-18. “Dry On” Mode, One Second Time Delay (Typical for High Level Applications)
Dry On Wet On
0.3 0.3
1 1
3 3
10 10
30 30
Seconds Delay
A. Mode “Dry On”
Figure 2-19. “Wet On” Mode, One Second Time Delay (Typical for Low Level Applications)
Dry On Wet On
0.3 0.3
1 1
A 3 3
10 10
30 30
Seconds Delay
A. Mode “Wet On”
18 Installation
00809-0100-4030, Rev FA December 2016
2.5 LED indication

Table 2-1. LED Indication
LED flash rate Switch status
Continuous Output state is on
1 every second Output state is off
1 every 2 seconds Uncalibrated – Refer to “Replacement and calibration of

electronic cassettes” on page 31
1 every 4 seconds Load fault; load current too high; load short circuit
2 times every second Indication of successful calibration
3 times every second Internal PCB fault (microprocessor, ROM, or RAM)

– Refer to “Product recycling and disposal” on page 4
Off Problem (e.g. supply)
Installation 19
December 2016 00809-0100-4030, Rev FA
2.6 Electrical installation

Before use, check that suitable cable glands and blanking plugs
are fitted and fully tightened.
Isolate supply before connecting the switch or removing
the electronics.
The Protective Earth (PE) terminal must be connected to an
external earthing system.
Note
When replacing a cassette, it is important to re-calibrate.
Refer to “Replacement and calibration of electronic cassettes” on page 31.
2.6.1 Direct load switching electronics cassette

Figure 2-20. Direct Load Switching (Two-wire, Red Label)
OPERATION MODE Direct Load

Dry On Mode Dry On Wet On Switching
LOAD LINE Dry
Wet 0.3 0.3
1 1 WARNING
3 3
Dry 10 10
Wet 30 30 Isolate Supply
Wet On Mode Seconds Delay Before Removing
1 2 3
PE R Fuse 2A(T) R = External load (must be fitted )

(Ground)
U = 20 - 264 V ~ (ac) (50/60Hz)
DPST
IOFF < 4 mA at 20 °C (24 - 230 Vac)
IL IOFF < 6 mA at -40 to 80 °C (20 - 264 Vac)
Neutral Live IL = 20 - 500 mA
IPK = 5 A, 40 ms (inrush)
)
U = 20 - 60 V (dc)
0V +V IOFF < 4 mA
IL = 20 - 500 mA
Note
A DPST (Double Pole, Single Throw) on/off switch must be fitted for safe disconnection of the power
supply. Fit the DPST switch as near as possible to the Rosemount 2120. Keep the DPST switch free of
obstructions. Label the DPST switch to indicate it is the supply disconnection device for the
Rosemount 2120.
Relay Connection Warning

The Rosemount 2120 requires a minimum current to operate (IOFF), which continues to flow when the
output is ‘off’. If selecting a relay to wire in series with the Rosemount 2120, ensure the drop-out voltage
of the relay is greater than the voltage generated across the relay coil when IOFF flows through it.
20 Installation
00809-0100-4030, Rev FA December 2016
High level, dry = on Low level, wet = on

Dry On Wet On Dry On Wet On
0.3 0.3 0.3 0.3

1 1 1 1
3 3 3 3
10 10 10 10
30 30 30 30
Seconds Delay Seconds Delay
U U
= Load off <4mA <4mA
12V 12V IL
IL IL
IL Fuse Fuse Fuse
Fuse
2A(T) 2A(T) 2A(T) 2A(T)
=Load on
DPST DPST DPST DPST
N L N L N L N L
0V +V 0V +V 0V +V 0V +V
LED on continuously LED flashes every second LED on continuously LED flashes every second
Installation 21
December 2016 00809-0100-4030, Rev FA
2.6.2 PNP/PLC electronics cassette

Figure 2-21. PNP Output for Load and Direct PLC Switching (Yellow Label)

Dry Isolate Supply
+ OUT -
1 1
3 3
Dry 10 10
Wet 30 30

Fuse 2A(T)
U = 20 - 60 V (dc) IL (MAX) = 0 - 500 mA

PE I < 4 mA + I L IPK = 5 A, 40 ms (inrush)
(Ground) UOUT(ON) = U - 2.5 Vac (20 °C)
UOUT(ON) = U - 2.75 Vac (-40 to 80 °C)
+V O/P 0V IL (OFF) < 100 A
High level Dry = ON Low level Wet = ON

0.3 0.3 0.3 0.3

1 1 1 1
3 3 3 3
10 10 10 10
30 30 30 30
+ OUT - + OUT - + OUT - + OUT -
U U
<100 A <100 A
<3V <3V
IL IL IL IL
+ I/P + I/P + I/P + I/P
PLC PLC PLC PLC

= Load off
+ OUT - + OUT - + OUT - + OUT -

=Load on
U U
R
<3V R <3V
IL
IL R
R Fuse Fuse < 100 A
Fuse Fuse < 100 A IL 1A(T)
IL 1A(T) 1A(T)
1A(T)
+ +
+ +
22 Installation
00809-0100-4030, Rev FA December 2016
2.6.3 Relay output electronics cassette (standard version)

Figure 2-22. Relay Output, DPCO (Green Label, Standard Cassette Version)
Warning OPERATION MODE Isolate Supply Before Removing

Seconds Delay Dry On
Dry On Wet On Dry
N L 0.3 0.3 Wet NC C NO NC C NO
1 1
RELAY
3 3
10
10 Dry
30
30 Wet
Wet On
1 2 3 4 5 6 7 8 9
NC C NO NC C NO
PE Fuse 0.5 (T) Resistive Load Inductive Load
(Ground)
cos φ = 1 ; cos φ = 0.4 ;
L/R = 0 ms L/R = 7 ms
DPST IMAX = 3.5 A
IMAX = 5 A
ac: ac:
U = 20...264 V ~ (ac)
N Live UMAX = 250 V UMAX = 250 V
(50/60 Hz)
I < 6 mA PMAX = 1250 VA PMAX = 875 VA
dc: dc:
U = 20...60 V (dc) UMAX = 30 V UMAX = 30 V
0V +V I < 6 mA PMAX = 240 W PMAX = 170 W
Note
A Double Pole, Single Throw on/off switch must be fitted for safe disconnection of the power supply.
Fit the DPST switch as near as possible to the Rosemount 2120 Level Switch. Keep the DPST switch free of
obstructions. Label the DPST switch to indicate it is the supply disconnection device for the level switch.

0.3 0.3 0.3 0.3

1 1 1 1
3 3 3 3
10 10 10 10
30 30 30 30
NC C NO NC C NO NC C NO NC C NO
Installation 23
December 2016 00809-0100-4030, Rev FA
2.6.4 Relay output electronics cassette (12 Vdc nominal version)

Figure 2-23. Relay Output, DPCO (Green Label, 12 Vdc Nominal Cassette Version)
12 VDC NOM. OPERATION MODE Isolate Supply Before Removing

+ Dry On Wet On Dry NC C NO NC C NO
0.3 0.3 Wet
RELAY
1 1
3 3
10
10 Dry
30 30 Wet
Wet On
1 2 3 4 5 6 7 8 9
NC C NO NC C NO
PE Fuse 0.5 (T) Resistive Load Inductive Load
(Ground)
cos φ = 1 ; cos φ = 0.4 ;
L/R = 0 ms L/R = 7 ms
DPST IMAX = 2 A IMAX = 1 A
ac: ac:
UMAX = 125 V UMAX = 125 V
PMAX = 62.5 VA PMAX = 37.5 VA
U = 9...30 V (dc)
dc: dc:
I < 4 mA
UMAX = 30 V UMAX = 30 V
0V +V PMAX = 60 W PMAX = 30 W
Note
A Double Pole, Single Throw on/off switch must be fitted for safe disconnection of the power supply. Fit
the DPST switch as near as possible to the Rosemount 2120. Keep the DPST switch free of obstructions.
Label the DPST switch to indicate it is the supply disconnection device for the Rosemount 2120.

0.3 0.3 0.3 0.3

1 1 1 1
3 3 3 3
10 10 10 10
30 30 30 30
NC C NO NC C NO NC C NO NC C NO
24 Installation
00809-0100-4030, Rev FA December 2016
2.6.5 NAMUR electronics cassette

Figure 2-24. NAMUR (Light Blue Label)
OPERATION MODE
Dry On Mode Dry On Wet On EN 50227 / NAMUR
- + Dry
Wet 0.3 0.3
8V 1 1
dc
3 3
Dry 10 10
Wet 30 30
1 2 Wet On Mode Seconds Delay
ION = 2.2 ... 2.5 mA
Ex IOFF = 0.8 ... 1.0 mA
- +
A certified intrinsically safe
Ex isolating amplifier to IEC 60947-5-6
Note
This electronics cassette is suitable for Intrinsically Safe applications and requires a certified isolating
barrier. See “Product Certifications” on page 51 for Intrinsically Safe approvals.
This electronics cassette is also suitable for non-hazardous (safe) area applications. It can only be
interchanged with the 8/16 mA cassette.
Do not exceed 8 Vdc.

0.3 0.3 0.3 0.3

1 1 1 1
3 3 3 3
10 10 10 10
30 30 30 30
- + - + - + - +
>2.2 mA <1.0 mA >2.2 mA <1.0 mA
Installation 25
December 2016 00809-0100-4030, Rev FA
2.6.6 8/16 mA electronics cassette

Figure 2-25. 8/16 mA (Dark Blue Label)
OPERATION MODE
+ Dry On Mode Dry On Wet On 8/16 mA

Dry
Wet 0.3 0.3
1 1
3 3
Wet 10 10
Dry 30 30
Wet On Mode Seconds Delay
1 2 3
I ON = 15 ... 17 mA
PE U = 24 Vdc Nominal
(Ground)
Ex I OFF = 7.5 ... 8.5 mA
- +
Ex A certified intrinsically safe barrier
must be used to meet IS requirements
- +
Drives 4-20 mA Analog Input
Note
This electronics cassette is suitable for Intrinsically Safe applications and requires a certified isolating
barrier. See “Product Certifications” on page 51 for Intrinsically Safe approvals.
This electronics cassette is also suitable for non-hazardous (safe) area applications.
In this case, U = 11 - 36 V (dc) and it can only be interchanged with a NAMUR cassette.

0.3 0.3 0.3 0.3

1 1 1 1
3 3 3 3
10 10 10 10
30 30 30 30
+ + + +
> 15 mA < 8.5 mA > 15 mA < 8.5 mA
26 Installation
Reference Manual Service and Troubleshooting
00809-0100-4030, Rev FA December 2016
Section 3 Service and Troubleshooting
Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 27

Magnetic test point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 28
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 29
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 29
Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 30
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 30
Service support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 30
Replacement and calibration of electronic cassettes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 31
3.1 Safety messages

Procedures and instructions in this manual may require special precautions to ensure the safety of the
personnel performing the operations. Information that raises potential safety issues is indicated by a
caution symbol ( ). The external hot surface symbol ( ) is used when a surface is hot and care must be
taken to avoid possible burns. If there is a risk of an electrical shock, the ( ) symbol is used. Refer to the
safety messages listed at the beginning of each section before performing an operation preceded by this
symbol.
37 lb. (18 kg). A risk assessment is required to be done before carrying, lifting, and installing the
level switch.
 The level switch cover must be fully engaged and locked to meet explosion-proof requirements.
 Verify the operating environment of the level switch is consistent with the appropriate hazardous
locations certifications.
 Make sure that the level switch is handled carefully. If the process seal is damaged, gas might
escape from the tank.
Service and Troubleshooting 27

Service and Troubleshooting Reference Manual
December 2016 00809-0100-4030, Rev FA

 If the level switch is installed in a high-voltage environment and a fault or installation error occurs,
high voltage may be present on the sensor leads and terminals.
 Make sure the main power to the level switch is off and the lines to any other external power source
are disconnected or not powered while wiring the level switch.
 Ensure the wiring is suitable for the electrical current and the insulation is suitable for the voltage,
temperature, and environment.
 Care must be taken to avoid possible burns. The flange and process seal may also be hot at high
process temperatures. Allow to cool before servicing.
3.2 Magnetic test point

A magnetic test point is on the side of the housing (Figures 3-1 or 3-2), allowing a functional test of the
Rosemount 2120 Level Switch. By touching a magnet on the target, the output will change state for as
long as the magnet is present.
Figure 3-1. Magnetic Test Point (Glass-filled Nylon Housing)
MAGNETIC DIRECT LOAD SWITCHING MAGNETIC DIRECT LOAD SWITCHING

TEST TEST
Supply 20 - 264Vac ~ Supply 20 - 264Vac ~
S
POINT POINT
50 - 60Hz 2VA 50 - 60Hz 2VA
2120D0AS1NAAA 20 - 60Vdc 0.5W 2120D0AS1NAAA 20 - 60Vdc 0.5W
Output Rating: Output Rating:
Load 20 - 500mA
N Load 20 - 500mA
41001029
*41001029*
MAX WORKING PRESSURE AT 20°C: 0.25 bar
MAX PROCESS TEMPERATURE: 150°C
MADE IN UNITED KINGDOM
41001029
*41001029*
MAX WORKING PRESSURE AT 20°C: 0.25 bar
MAX PROCESS TEMPERATURE: 150°C
MADE IN UNITED KINGDOM
www.rosemount.com www.rosemount.com
MAGNETIC
TEST
No magnet Magnet
POINT
S
N
Output off Output on
Output on Output off
Figure 3-2. Magnetic Test Point (Metal Housing)
TP TP
S TP
N
S
N
No magnet Magnet
Output off Output on
Output on Output off
28 Service and Troubleshooting

00809-0100-4030, Rev FA December 2016
3.3 Inspection
 Visually examine the Rosemount 2120 Level Switch for damage. If it is damaged, do not use.
 Ensure the housing cover, cable glands, and blanking plugs are fitted securely.
 Fit blanking a plug where required.
 Ensure the LED flash rate is once every second or continually on.
If anything else is demonstrated, see “LED indication” on page 19.
Figure 3-3. Visually Examine Rosemount 2120
OK
3.4 Maintenance
Figure 3-4. Maintenance
OK
Note
Only use a soft brush for cleaning.

December 2016 00809-0100-4030, Rev FA
3.5 Spare parts

See “Spare parts and accessories” on page 50.
3.6 Troubleshooting
If there is a malfunction, see Table 3-1 for information on possible causes.
Table 3-1. Troubleshooting Chart
Fault Symptom/indication Action/solution
• No LED; no power • Check the power supply; (check the load on direct
load switching electronics).
• LED flashing • See “LED indication” on page 19.
Does not • Fork is damaged • Replace the Rosemount 2120 Level Switch.
switch
• Thick encrustation • Clean the fork with care.
on the fork
• 5 second delay when changing • This is normal – wait 5 seconds.

mode/delay
Incorrect • “Dry = On” or “Wet = On” • Set the correct mode on the electronics cassette.
switching set incorrectly
• Turbulence • Set a longer switching time delay.
• Excessive electrical noise • Suppress the cause of the interference.

Faulty
switching
• Cassette has been fitted from • Fit the factory supplied cassette and then calibrate.
another Rosemount 2120 Level (See “Replacement and calibration of electronic
Switch cassettes” on page 31)
3.7 Service support

To expedite the return process outside of the United States, contact the nearest Emerson representative.
Within the United States, call the Emerson Instrument and Valves Response Center using the
1 800 654 7768 toll-free number. This center, available 24 hours a day, will assist you with any needed
information or materials.
The center will ask for product model and serial numbers, and will provide a Return Material
Authorization (RMA) number. The center will also ask for the process material to which the product was
last exposed.
Individuals who handle products exposed to a hazardous substance can avoid injury if they are
informed of, and understand, the hazard. If the product being returned was exposed to a hazardous
substance as defined by OSHA, a copy of the required Material Safety Data Sheet (MSDS) for each
hazardous substance identified must be included with the returned goods.

00809-0100-4030, Rev FA December 2016
3.8 Replacement and calibration of electronic cassettes

When replacing a damaged or faulty electronic cassette, calibrate the replacement cassette to the
operating frequency of the fork assembly.
This section describes what is required for calibration. Calibration sequence steps 3 to 13 are time
dependent and must be carried out within the noted times. The purpose of the time dependency and
switching sequence is to prevent an accidental calibration from occurring.
If this replacement is taking place in a hazardous area, only qualified personnel should perform the
replacement. All work in hazardous areas must be carried out in accordance with the local code. For
general hazardous area requirements of this equipment, refer to Appendix B: Product Certifications.
Calibration of the device is complex and it may take several attempts before calibration is successful.
3.8.1 Replacement sequence

On Intrinsically Safe (I.S.) approved versions of the Rosemount 2120 Level Switch, it is recommended
that replacement and calibration be performed in a non-hazardous (safe) area.
Note
Intrinsically Safe approved cassettes can only be replaced with the same type of IS cassette.
Non-I.S. cassette types can be interchanged with other non-I.S. cassettes, but a new label must be fitted
and the original part number transferred to the new label. Before starting the replacement and
calibration procedure, ensure that any controlled process will not be adversely affected.
To replace the cassette

1. Isolate and disconnect the power to the Rosemount 2120 Level Switch, and insulate the ends of the
wires. On units with a relay cassette, there may be more than one power source.
2. Remove the cover and disconnect the wires, noting any connections (Figure 3-5) and the exact mode
switch position (Figure 3-6 on page 32) on the cassette to be replaced.
3. Remove and retain the two fixing screws from the base of the cassette and unplug the cassette.
4. Plug in the replacement cassette, replace the screws, reconnect the wires, and set the mode switch to
“Wet On” with a one second delay (Figure 3-7 on page 32).
5. Reconnect the power to the unit.
Figure 3-5. Example of Installed Cassette

Dry Isolate Supply
+ OUT -
1 1
3 3
Dry 10 10
Wet 30 30

December 2016 00809-0100-4030, Rev FA
Figure 3-6. Mode Switch Setting (Existing Cassette)

Dry On Wet On This is an example of how the existing cassette may look. Here, the mode switch is set to
“Dry On” with a one second delay.
0.3 0.3
1 1 Take note of the actual setting.
3 3
10 10 SETTING IS: ____________________________________
30 30
Seconds Delay
Figure 3-7. Mode Switch Setting (Replacement Cassette)

Dry On Wet On Set the mode switch of the new cassette to “Wet On” with a one second delay.
0.3 0.3
1 1
3 3
10 10
30 30
Seconds Delay
3.8.2 Calibration sequence

To calibrate the cassette
1. Ensure that the forks are dry, and the mode switch is set to “Wet On” with the
time delay set to 1 second (Figure 3-7).
2. Check that the LED is flashing at a rate of one flash per second.
Proceed to step 8 if it is on continuously.
3. Apply a magnet to the test-point (as shown on page 28).
4. After a one second delay, the LED will be lit continuously.
5. Within once second, rotate the mode switch two steps clockwise.
6. After a two second delay, the LED will go out.
7. Within three seconds, rotate the mode switch two steps counter-clockwise.
Proceed to step 13.
8. Apply a magnet to the test-point (as shown on page 28).
9. After a one second delay, the LED will flash at a rate of one flash per second.
10.Within one second, rotate the mode switch two steps clockwise.
11.After a two second delay, the LED will go out (stop flashing).
12.Within three seconds, rotate the mode switch two steps counter-clockwise.
13.After a two second delay, the LED should flash twice per second.
14.If the LED is flashing twice per second, the calibration has occurred correctly.
Remove the magnet from the test point. After a one second delay, the unit will return to normal
operation. Proceed to step 17.

00809-0100-4030, Rev FA December 2016
15.If the LED is flashing once per second or it is on continuously, the calibration has failed. Remove the
magnet from the test-point, wait ten seconds, and repeat from step 2.
16.If the LED stays off after the two second delay of step 13, the sensor is not working correctly.
Check that the forks are clean and dry. Also, verify there is nothing jamming or touching the sensor.
If no fault is found with the sensor, the entire unit should be returned for repair
(see “Product recycling and disposal” on page 4).
17.Set the mode switch to the original setting noted in Figure 3-6 and wait five seconds.
18.Replace the cover and check that the system works.

December 2016 00809-0100-4030, Rev FA

Reference Manual Specifications and Reference Data
00809-0100-4030, Rev FA December 2016
Appendix A Specifications and Reference Data

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 35
Dimensional drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 39
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 46
A.1 Specifications The maximum extended length is 157.5 in. (4000 mm) except for
ECTFE copolymer coating and mechanically-polished process
A.1.1 General connection options which have a maximum length of 59.1 in.
(1500 mm) and 39.4 in. (1000 mm) respectively.
Product
Material selection
Rosemount 2120 Level Switch
Emerson provides a variety of Rosemount product with various
Measuring principle
product options and configurations including materials of
Vibrating fork technology construction that can be expected to perform well in a wide range
of applications. The Rosemount product information presented is
Applications
intended as a guide for the purchaser to make an appropriate
Most liquids including coating liquids, aerated liquids, and slurries. selection for the application. It is the purchaser’s sole
responsibility to make a careful analysis of all process parameters
A.1.2 Mechanical
(such as all chemical components, temperature, pressure, flow
Housing / Enclosure rate, abrasives, contaminants, etc.), when specifying product,
Table A-1. Housing/Enclosure Specifications materials, options and components for the particular application.
Housing code A D X Y S T Emerson is not in a position to evaluate or guarantee the

compatibility of the process fluid or other process parameters with
Nylon PA66 Al alloy ASTM
Housing material 316C12 SST the product, options, configuration or materials of construction
30%GF B85 A360.0
selected.
Rotational Yes No No
Not Polyurethane Not Process connection materials
Housing paint
applicable paint applicable
316/316L stainless steel (1.4401/1.4404 dual certified).
LED window Nylon PA12 None None
1/2-in. 3/4-in. 3/4-in. Alloy C (UNS N10002) and Alloy C-276 (UNS N10276)
Conduit entry M20 M20 M20 – available for flanged, and BSPT and NPT threaded process
ANPT ANPT ANPT
connections (3/4- and 1-in. BSPT (R), and 3/4- and 1-in. NPT).
IP66/67 to IP66/67 to
Ingress IP66/67 to
EN60529, EN60529, ECTFE co-polymer coated 316/316L Stainless Steel
protection EN60529
NEMA® 4X NEMA 4X
(1.4401/1.4404 dual certified) – only available for a flanged
Rosemount 2120 but excludes 1-in./DN25/25A flanges.
Connections
Gasket material for 3/4- and 1-in. BSPP (G) is non-asbestos BS7531
Threaded, Tri Clamp, and flanged process connections.
Grade X carbon fiber with rubber binder.
See “Process connection size / type” on page 46 for a full list.
Extended lengths
A.1.3 Functional
Table A-2. Minimum Extended Lengths Maximum operating altitude
Process connection Minimum extended length 6562 ft. (2000 m)

3/4–in. threaded 3.8 in. (95 mm) Maximum operating pressure
1–in. threaded 3.7 in. (94 mm)
The final rating depends on the selected process connection.
Flanged 3.5 in. (89 mm)
 Threaded connection: see Figure A-1 on page 36 for operating
Tri Clamp 4.1 in. (105 mm)
pressures
Specifications and Reference Data 35

00809-0100-4030, Rev FA December 2016
Clamp glands 02120-2000-0001 and 02120-2000-0002

Figure A-2. Operating Temperatures
(page 46) limit the maximum pressure to 18.85 psig (1.3 bar g).
 Tri Clamp connection: 435 psig (30 bar g).
Ambient Temperature °F (°C)

 Flanged connection: 176 (80)
See Figure A-1 or Table A-3 (whichever gives the lowest
pressure). 122 (50)
32 (0)
Figure A-1. Process Pressure
-40 (-40)
-40 32 140 302

Process Pressure psig (barg)
(-40) (0) (60) (150)

1450 (100)
Process Temperature °F (°C)
1160 (80)
0 (0) Liquid density requirement

-14.5 (-1.0)
-40 32 122 302 Process Minimum of 37.5 lb/ft3 (600 kg/m3).
(-40) (0) (50) (150) Temperature °F (°C)
Liquid viscosity range
Up to 10000 cP (centiPoise).
Table A-3. Maximum Flange Pressure Rating Solids content and coating
Standard Class/Rating SST flanges Maximum recommended diameter of solid particles in the liquid is
ASME B16.5 Class 150 275 psig(1) 0.2 in. (5 mm).
ASME B16.5 Class 300 720 psig(1) For a coating product, avoid bridging of forks.
ASME B16.5 Class 600 1440 psig(1)
Switching delay
EN1092-1 PN 10/16 16 barg(2)
User selectable 0.3, 1, 3, 10, 30 seconds delay for dry-to-wet and
EN1092-1 PN 25/40 40 barg(2)
wet-to-dry switching.
EN1092-1 PN 63 63 barg(2)
Clean-In-Place (CIP) cleaning
EN1092-1 PN 100 100 barg(2)
JIS B2220 10K 14 barg(3) Withstands cleaning routines up to 160 °F (71 °C).
JIS B2220 20K 34 barg(3) Steam-In-Place (SIP) cleaning
1. At 100 °F (38 °C), the rating decreases with an increasing process
temperature. Withstands cleaning routines up to 275 °F (135 °C).
temperature.
NACE
temperature.
NACE compliance to MR0175 / ISO 15156 or MR0103, depending
on the option code selected for the model number.
Minimum and maximum operating temperatures Safety integrity level
See Figure A-2 for operating temperatures. The Rosemount 2120 FMEDA is certified for SIL2, and is SIL3
Clamp glands 02120-2000-0001 and 02120-2000-0002 (page 46) capable, for all electronics except the Direct Load option.
limit the maximum temperature to 257 °F (125 °C). Visit the Rosemount 2120 web page for additional information.
The ambient temperature for a 8/16 mA cassette is limited to

158 °F (70 °C) in dust applications.
36 Specifications and Reference Data

Specifications and Reference Data Reference Manual
December 2016 00809-0100-4030, Rev FA
A.1.4 Performance Grounding
Hysteresis (water) The Rosemount 2120 must always be grounded either through the
terminals or using the external ground connection provided.
±0.039-in. (±1 mm) nominal.
Conduit plugs/cable gland
Switching point (water)
Metal housing:
0.5 in. (13 mm) from tip (vertical) / from edge (horizontal) of fork
Conduit entries for explosion-proof areas are shipped with one Exd
(this will vary with different liquid densities).
plug (loose in bag) and two dust caps fitted. Use suitably rated
A.1.5 Electrical cable glands. Unused conduit entries must be sealed with a
suitably rated blanking plug.
Switching mode
Glass-filled nylon housing with direct load, PNP/PLC and IS
User selectable switching mode (“Dry = on” or “Wet = on”). electronics are shipped with one PA66(1) cable gland and one
Protection blanking plug.
Polarity insensitive Glass-filled nylon housing with relay electronics are shipped with
– on Relay (except 12 Vdc version) and Direct Load electronics two PA66(1) cable glands.
Over-current protection Electrical connections

– on Direct Load and PNP/PLC electronics  Direct load switching (mains two wire) cassette
Short-circuit protection OPERATION MODE Direct Load
Dry On Mode Dry On Wet On Switching
– on Direct Load and PNP/PLC electronics LOAD LINE Dry
Wet 0.3 0.3
1 1 WARNING
Load-missing protection 3 3
Dry 10 10
– on Direct Load and PNP/PLC electronics Wet 30 30 Isolate Supply
Wet On Mode Seconds Delay Before Removing
1 2 3
Surge protection (to IEC61326)

PE R Fuse 2A(T) R = External load (must be fitted )
– available on all versions of the Rosemount 2120 (Ground)
U = 20 - 264 V ~ (ac) (50/60Hz )
DPST
IOFF < 4 mA
Heartbeat LED IL IL = 20 - 500 mA
Neutral Live IPK = 5 A, 40 ms (inrush)
The Rosemount 2120 has a status-indicating ‘heartbeat’ LED, U = 20 - 60 V (dc)

IOFF < 4 mA
which can be seen at all times and from all angles through a lens in 0V +V
IL = 20 - 500 mA
the cover (no lens in metal housings).
The LED flashes when the output is ‘off’ and is constantly lit when it  NAMUR (light blue) cassette
is ‘on’. The LED gives a constant indication that the Rosemount
2120 is functioning correctly (different flash rates are used to OPERATION MODE
Dry On Mode Dry On Wet On EN 50227 / NAMUR
indicate a product malfunction) and gives a local indication of the - + Dry
Wet 0.3 0.3
8V
process state. dc
1
3
1
3
Dry 10 10
Magnetic test point 1 2

Wet
Wet On Mode
30
Seconds Delay
30
A magnetic test point is located on the side of the housing, ION = 2.2 ... 2.5 mA
IOFF = 0.8 ... 1.0 mA
allowing a functional test of the Rosemount 2120 and a system Ex IFAULT < 1.0 mA
connected to it. By holding a magnet to the target, the output

- +
changes state for as long as the magnet is held there. Ex
A certified intrinsically safe
isolating amplifier to IEC 60947-5-6
Terminal connection (wire diameter)
Minimum 26 AWG, Maximum 14 AWG (0.13 to 2.5 mm2).

Note national regulations.
1. Cable diameter 0.2 to 0.3 in. (5 to 8 mm)

00809-0100-4030, Rev FA December 2016
 8/16 mA (dark blue) cassette  DPCO dual relay cassette (12 Vdc nominal version)
OPERATION MODE
12 VDC NOM. OPERATION MODE Isolate Supply Before Removing
+ Dry On Mode Dry On Wet On 8/16 mA Seconds Delay
Dry
+ Dry On
Wet 0.3 0.3 Dry On Wet On Dry NC C NO NC C NO
1 1 0.3 0.3 Wet
RELAY
3 3 1 1
Wet 10 10 3 3
Dry 30 30
10
Wet On Mode Seconds Delay 10 Dry
30 30 Wet
1 2 3
Wet On
1 2 3 4 5 6 7 8 9
I ON = 15 ... 17 mA U = 24 Vdc Nominal
I OFF = 7.5 ... 8.5 mA NC C NO NC C NO
PE
(Ground) I FAULT < 3.7 mA PE Fuse 0.5 (T)
Ex (Ground)
Resistive Load Inductive Load
cos φ = 1 ; cos φ = 0.4 ;
L/R = 0 ms L/R = 7 ms
- + DPST IMAX = 2 A IMAX = 1 A
Ex A certified intrinsically safe barrier ac: ac:
must be used to meet IS requirements UMAX = 125 V UMAX = 125 V
PMAX = 62.5 VA PMAX = 37.5 VA
U = 9...30 V (dc)
- + I < 4 mA dc: dc:
Drives 4-20 mA Analog Input UMAX = 30 V UMAX = 30 V
0V +V PMAX = 60 W PMAX = 30 W
 DPCO dual relay cassette (standard version)  Solid state PNP output for direct interface to a PLC
Warning OPERATION MODE Isolate Supply Before Removing OPERATION MODE PLC/PNP
Dry On Wet On Dry Dry On Mode Dry On Wet On
N L 0.3 0.3 Wet NC C NO NC C NO Dry Isolate Supply
+ OUT -
1 1 Wet Before Removing
RELAY
0.3 0.3
3 3 1 1
10
10 Dry 3 3
30
30 Wet Dry 10 10
Wet On Wet 30 30
1 2 3 4 5 6 7 8 9 1 2 3 4 Wet On Mode Seconds Delay
Fuse 2A(T)
NC C NO NC C NO IL (MAX) = 0 - 500 mA
U = 20 - 60 V (dc)
PE Fuse 0.5 (T) Resistive Load Inductive Load PE I < 4 mA + I L IPK = 5 A, 40 ms (inrush)
(Ground)
cos φ = 1 ; cos φ = 0.4 ; (Ground)
UOUT(ON) = U - 2.5 V
L/R = 0 ms L/R = 7 ms
DPST IMAX = 3.5 A IL (OFF) < 100 A
IMAX = 5 A +V O/P 0V
ac ac
U = 20...264 V ~ (ac)
N Live UMAX = 250 V UMAX = 250 V
(50/60 Hz)
I < 6 mA PMAX = 1250 VA PMAX = 875 VA
dc dc
U = 20...60 V (dc) UMAX = 30 V UMAX = 30 V
0V +V I < 6 mA PMAX = 240 W PMAX = 170 W
Note
The external DPST switch that is shown in the wiring diagrams is an optional local disconnect (customer supplied).

December 2016 00809-0100-4030, Rev FA
A.2 Dimensional drawings

Figure A-3. 3/4- and 1-in. Threaded Mounting (Standard Length)
Glass-filled nylon housing Aluminum/stainless steel housing
3.5 (89)
Allow 1.2 (30) Allow 1.2 (30)
to remove cover 4 (102) to remove cover 4.7 (120)
5 5.9
(127) A (151) B
C
C
D
2.7 D
2.7
(69 1.7 (69)
0.5 (13) switchpoint 1.7
(44) (44)
(when mounted vertically)
0.5 (13) 0.5 (13)

0.5 (13) switchpoint
switchpoint (when switchpoint (when
mounted horizontally) (when mounted vertically)
mounted horizontally)
A. Cable entry M20 x 1.5 or 1/2-in. ANPT C. 1.6 (40) A/F hexagon
B. Cable entry M20 x 1.5 or 3/4-in. ANPT D. 3/4- or 1-in. thread
Dimensions are in inches (millimeters). See the Rosemount 2120 web page for all 1-in. BSPP threaded dimensional drawings.

00809-0100-4030, Rev FA December 2016
Figure A-4. 3/4- and 1-in. Thread Mounting (Extended Length)
Allow 1.2 (30) 3.5 (90)

to remove cover Allow 1.2 (30)
4 (102) 4.7 (120)
to remove cover
5.9
(151) A B
6.7
(171)
C
C
D
D
E(M) Ø1.1 (28) for 1-in. thread

Ø0.9 (23) for 3/4-in. thread
E(M) 1.7
(44)
Ø1.1 (28) for 1-in. thread 0.5 (13) 0.5 (13) switchpoint
Ø0.9 (23) for 3/4-in. thread switchpoint (when
1.7 0.5 (13) switchpoint
(44) (when mounted vertically)
0.5 (13)
switchpoint (when
B. Cable entry M20 x 1.5 or 3/4-in. ANPT D. 3/4- or 1-in. thread
Dimensions are in inches (millimeters). See the Rosemount 2120 web page for all 1-in. BSPP threaded dimensional drawings.
Table A-4. Fork Length for 3/4- and 1-in. Threaded Rosemount 2120
Process Standard length Minimum length Maximum length
connection fork length code A fork length code E (M) fork length code E (M)
3/4-in. thread 1.7 in. (44 mm) 3.75 in. (95 mm) 157.5 in. (4000 mm)
1-in. thread 1.7 in. (44 mm) 3.74 in. (94 mm) 157.5 in. (4000 mm)

December 2016 00809-0100-4030, Rev FA
Figure A-5. Tri Clamp Mounting (Standard Length, Surface Finish Codes 1 and 2)
(and not hygienically approved) (and not hygienically approved)
4 (102) 4.7 (120)
Allow 1.2 (30)
Allow 1.2 (30) 3.5 (90) to remove cover
to remove cover
A B
5.2 6.1
(132) (155)
C D C
D
Ø0.9 (23)
2.5 Ø0.9 (23)
(64) 1.7 2.5
0.5 (13) switchpoint 1.7
(44) (64) 0.5 (13) switchpoint
(when mounted vertically) (44)
(when mounted horizontally)
B. Cable entry M20 x 1.5 or 3/4-in. ANPT D. 11/2-in. (38 mm) or 2-in. (51 mm) Tri Clamp, surface finish codes 1 and 2
Dimensions are in inches (millimeters).
Figure A-6. Tri Clamp Mounting (Standard Length, Surface Finish Codes 3, 4, 7, and 8)
Glass-filled nylon housing Aluminum steel housing
(and hygienically approved) (and hygienically approved)
4 (102) Allow 1.2 (30) 4.7 (120)

to remove lid
Allow 1.2 (30) 3.5 (90)
to remove lid
B
A
6.1
5.2 (155)
(132)
D
Ø1.65 (42) D Ø1.65 (42)
Ø0.9 (23) Ø0.9 (23)

2.5 2.5
1.7 (64) 1.7
(64) 0.5 (13) switchpoint (44) 0.5 (13) switchpoint
0.5 (13) switchpoint 0.5 (13) switchpoint
(when mounted horizontally) (when mounted horizontally)
B. Cable entry M20 x 1.5 or 3/4-in. ANPT D. 11/2-in. (38 mm) or 2-in. (51 mm) Tri Clamp, surface finish codes 3, 4, 7, and 8

00809-0100-4030, Rev FA December 2016
Figure A-7. Tri Clamp Mounting (Extended Length, Surface Finish Codes 1 and 2)

(and not hygienically approved) (and not hygienically approved)
4 (102)
Allow 1.2 (30)
Allow 1.2 (30)
to remove cover 4.7 (120)
to remove cover 3.5 (90)
A B
5.2
(132) 6.4
(162)
C
Ø1.6 (41)
Ø1.6 (41) C
E(M) E(M)
Ø1.1 (28)
Ø1.1 (28) 1.7

(44)
1.7 (when mounted vertically)
A. Cable entry M20 x 1.5 or 1/2-in. ANPT C. 11/2-in. (38 mm) or 2-in. (51 mm) Tri Clamp, surface finish codes 1 and 2
B. Cable entry M20 x 1.5 or 3/4-in. ANPT
Table A-5. Fork Length for Tri Clamp Rosemount 2120 (Not Hygienically Approved)
Tri Clamp
1.7 in. (44 mm) 4.13 in. (105 mm) 157.5 in. (4000 mm)
(surface finish code 1)
Tri Clamp
1.7 in. (44 mm) 4.13 in. (105 mm) 157.5 in. (1000 mm)
(surface finish code 2)

December 2016 00809-0100-4030, Rev FA
Figure A-8. Tri Clamp Mounting (Extended Length, Surface Finish Codes 3, 4, 7, and 8)
Glass-filled nylon housing Aluminum housing

(and hygienically approved) (and hygienically approved)
4 (102)
Allow 1.2 (30)
Allow 1.2 (30) to remove cover 4.7 (120)
3.5 (90)
to remove cover
A
B
5.2
(132) 6.1
(155)
Ø1.65 (42) C
C
Ø1.65 (42)
E(M) Ø0.9 (23)

E(M)
Ø0.9 (23)
1.7
(44)
(when mounted vertically) 1.7
(44)
0.5 (13) switchpoint (when mounted vertically)
A. Cable entry M20 x 1.5 or 1/2-in. ANPT C. 11/2-in. (38 mm) or 2-in. (51 mm) Tri Clamp, surface finish codes 3, 4, 7, and 8
Table A-6. Fork Length for Tri Clamp Rosemount 2120 (Hygienically Approved)
Tri Clamp
1.7 in. (44 mm) 4.13 in. (105 mm) 157.5 in. (1000 mm)
(surface finish codes 3, 4, 7, and 8)

00809-0100-4030, Rev FA December 2016
Figure A-9. Flange Mounting (Standard Length)
3.5 (90)
Allow 1.2 (30) Allow 1.2 (30)
to remove cover 4 (102) to remove cover 4.7 (120)
4.8
(121) A B
6
(154)
Ø1.1 (28) for 11/2 in. or larger flange

Ø1.1 (28) for 11/2 in. or
4 Ø0.9 (23) for up to 1 in. flange
4.0 larger flange;
(102)
(102) Ø0.9 (23) for up to 1 in. flange
1.7 0.5 (13) 1.7
(44) Switchpoint (when (44)
mounted vertically)
0.5 (13) 0.5 (13)
0.5 (13)
Switchpoint (when Switchpoint (when
mounted horizontally) Switchpoint (when
mounted horizontally) mounted vertically)
A. Cable entry M20 x 1.5 or 1/2-in. ANPT


December 2016 00809-0100-4030, Rev FA
Figure A-10. Flange Mounting (Extended Length)
3.5 (89)
Allow 1.2 (30)
to remove cover
4 (102)
Allow 1.2 (30) to
remove cover 4.7 (120)
4.8
(121)
A 6
(154)
B
E(M) Ø1.1 (28) for 11/2 in. or

Ø1.1 (28) for 11/2 in. or E(M)
larger flange; larger flange;
Ø0.9 (23) for up to 1 in. flange Ø0.9 (23) for up to 1 in. flange
1.7
1.7 (44)
0.5 (13)
(44) Switchpoint (when
0.5 (13)
mounted vertically) 0.5 (13)
Switchpoint (when
0.5 (13) mounted horizontally) Switchpoint (when
Switchpoint (when mounted vertically)
A. Cable entry M20 x 1.5 or 1/2-in. ANPT

Table A-7. Fork Length for Flanged Rosemount 2120

Standard length Minimum length Maximum length
Process connection material
model code H model code E (M) model code E (M)
Stainless steel 4 in. (102 mm) 3.5 in. (89 mm) 157.5 in. (4000 mm)
ECTFE co-polymer coated 4 in. (102 mm) 3.5 in. (89 mm) 59.1 in. (1500 mm)
Alloy C and Alloy C-276 4 in. (102 mm) 3.5 in. (89 mm) 157.5 in. (4000 mm)

00809-0100-4030, Rev FA December 2016
A.3 Ordering information

Specification and selection of product materials, options, or components must be made by the purchaser of the equipment.
See page 35 for more information on material selection.
Table A-8. Rosemount 2120 Ordering Information

The starred options (★) represent the most common options and should be selected for best delivery. The non-starred offerings are
subject to additional delivery lead time.
Model Product description

2120 Vibrating Fork Liquid Level Switch / –40…302 °F (–40...150 °C)
Materials of construction: process connection/fork
D 316/316L Stainless Steel (1.4401/1.4404) dual certified ★
F(1) ECTFE copolymer, coated 316/316L SST (1.4401/1.4404)

C Alloy C (UNS N10002), Alloy C-276 (UNS N10276), Solid
Process connection size / type
0A 3/4-in. BSPT (R) Thread ★
0B 3/4-in. BSPP (G) Thread ★
0D 3/4-in. NPT Thread ★
1A 1-in. BSPT (R) Thread ★
1B 1-in. BSPP (G) Thread ★
1D 1-in. NPT Thread ★
1P 1-in. BSPP (G), O-ring ★
5R 11/2-in. (38 mm) Tri Clamp ★
2R 2-in. (51 mm) Tri Clamp ★
1G 1-in. ASME B16.5 Class 150 Raised Face (RF) Flange ★
1H 1-in. ASME B16.5 Class 300 Raised Face (RF) Flange ★
1J 1-in. ASME B16.5 Class 600 Raised Face (RF) Flange ★
5G 11/2-in. ASME B16.5 Class 150 Raised Face (RF) Flange ★
5H 11/2-in. ASME B16.5 Class 300 Raised Face (RF) Flange ★
1K DN25, EN1092 PN 10/16 Flange ★
1L DN25, EN1092 PN 25/40 Flange ★
1M DN25, EN1092 PN 63 Flange ★
1N DN25, EN1092 PN 100 Flange ★
5K DN40, EN1092 PN 10/16 Flange ★
5L DN40, EN1092 PN 25/40 Flange ★
2K DN50, EN1092 PN 10/16 Flange ★
2L DN50, EN1092 PN 25/40 Flange ★

December 2016 00809-0100-4030, Rev FA

7K DN65, EN1092 PN 10/16 Flange ★
7L DN65, EN1092 PN 25/40 Flange ★
3K DN80, EN1092 PN 10/16 Flange ★
3L DN80, EN1092 PN 25/40 Flange ★
4K DN100, EN1092 PN 10/16 Flange ★
4L DN100, EN1092 PN 25/40 Flange ★
5J 11/2-in. ASME B16.5 Class 600 Raised Face (RF) Flange

2J 2-in. ASME B16.5 Class 600 Raised Face (RF) Flange
5M DN40, EN1092 PN 63 Flange
5N DN40, EN1092 PN 100 Flange
SA 25A, 10K, JIS B2220 Flange
SB 25A, 20K, JIS B2220 Flange
TA 40A, 10K, JIS B2220 Flange
TB 40A, 20K, JIS B2220 Flange
UA 50A, 10K, JIS B2220 Flange
UB 50A, 20K, JIS B2220 Flange
VA 80A, 10K, JIS B2220 Flange
VB 80A, 20K, JIS B2220 Flange
ZA 100A, 10K, JIS B2220 Flange
ZB 100A, 20K, JIS B2220 Flange
XX(2) Customer Specific
Electronic type Available certifications
T Direct load switching (Mains 2-wire) 20 to 264 Vac 50/60Hz, 20 to 60 Vdc NA, E1, E5, E6, E7, EM, G5, G6 ★
G PNP/PLC (3-wire) 20 to 60 Vdc NA, E1, E5, E6, E7, EM, G5, G6 ★
V Relay DPCO, 20 to 264 Vac 50/60Hz, 20 to 60 Vdc NA, E1, E5, E6, E7, EM, G5, G6 ★
E Relay DPCO, 9...30 Vdc E5 and G5 ★
K NAMUR All ★
H 8/16 mA All ★

00809-0100-4030, Rev FA December 2016

Available Available
Surface finish
connections housings
1 Standard surface finish All All ★
2(3) Hand polished (Ra < 0.4 μm) Tri Clamp only All ★
3(4) Ra < 0.76 μm, hygienically approved Tri Clamp only A, D, X, Y ★
4(4) Electro-polished to 0.76 μm, hygienically approved Tri Clamp only A, D, X, Y ★
7(4) Mechanically-polished to Ra < 0.1 μm, hygienically approved Tri Clamp only A, D, X, Y ★
8(4) Electro-polished to Ra < 0.38 μm, hygienically approved Tri Clamp only A, D, X, Y ★
Electronic types Available

Product certifications
allowed housings
NA(5) No Hazardous Locations Certifications All except option E All ★
G5(6) FM Ordinary Locations (unclassified, safe area) All Y, T ★
G6(7) CSA Ordinary Locations (unclassified, safe area) All except option E Y, T ★
E1 ATEX Flameproof All except option E X, S ★
E5(6) FM Explosion-proof All Y, T ★
E6(7) CSA Explosion-proof All except option E Y, T ★
E7 IECEx Explosion-proof All except option E X, S ★
EM Technical Regulation Customs Union (EAC), Flameproof All except option E X, S ★
I1 ATEX Intrinsic Safety K, H All ★
I5 FM Intrinsic Safety K, H All ★
I6 CSA Intrinsically Safe K, H All ★
I7 IECEx Intrinsic Safety K, H All ★
IM Technical Regulation Customs Union (EAC), Intrinsic. Safe K, H All ★
Housing Available certifications

A Glass Filled Nylon, M20 conduits/cable threads NA, I1, I5, I6, and I7 ★
D Glass Filled Nylon, 1/2-in. ANPT conduits/cable threads NA, I1, I5, I6, and I7 ★
X Aluminum Alloy, M20 conduits/cable threads All except G5, G6, E5, E6 ★
Y Aluminum Alloy, 3/4-in. ANPT conduits/cable threads All except E1, E7, and EM ★
S Stainless Steel, M20 conduits/cable threads All except G5, G6, E5, E6 ★
T Stainless Steel 3/4-in. ANPT conduits/cable threads All except E1, E7, and EM ★
Fork length Available connection

A Standard length 1.7 in. (44 mm) All except flanged options ★
H(8) Standard length flange 4.0 in. (102 mm) All flanged options ★
E(9) Extended, customer specified length in tenths of inches All except 1-in. BSPP O-ring (1P) ★
M(9) Extended, customer specified length in millimeters All except 1-in. BSPP O-ring (1P) ★
Specific extended fork length

0000 Factory default length (only if Fork Length A or H is selected) ★
XXXX(9) Specific customer specified length in tenths of inches, or millimeters (XXX.X inches or XXXX mm) ★
Typical Model Number: 2120 D 0A K 1 I1 A 0000

December 2016 00809-0100-4030, Rev FA

Options (include with the selected model number)

Calibration data certification
Q4 Certificate of functional test ★
Material traceability certification(8)(10)

Q8 Material traceability certification per EN 10204 3.1 ★
Material certification(8)(10)
Q15 NACE® MR0175 / ISO 15156 ★
Q25 NACE MR0103 ★
Safety certification(11)
QS Prior-use certificate of FMEDA Data ★
QT Safety certificate to IEC61508 ★
Special procedures(12)
P1 Hydrostatic testing with certificate ★
Hygienic certifications(13)
QA 3-A certificate ★
QE EHEDG certificate ★
ASME-BPE statement(13)
QB ASME-BPE statement ★
Food Drug Administration statement(13)

QH FDA statement ★
Surface finish certification(13)

Q16 Surface finish certificate ★
Example of options included with the model number: 2120 D 0A K 1 I1 A 0000 Q8

1. ECTFE co-polymer coating is only available for a flanged Rosemount 2120 but excludes 1-in./DN25/25A flanges.
Flanges are dual certified 316 and 316L Stainless Steel (1.4401 and 1.4404).
2. Other process connections available upon request.

3. Hand-polished for hygienic connections to better than 0.4 μm Ra such that there are no pits, folds, crevices or cracks discernible to the naked eye (i.e. no features larger
than 75 micrometers based on resolving 1/60 degree at a distance of 250 mm).
4. Not available for explosion-proof or flameproof product certifications.

5. Includes the Technical Regulation Customs Union (EAC) ordinary location mark.
6. See “Product Certifications” on page 51. E5 includes G5 requirements. G5 is for use in unclassified, safe area locations only.
7. See “Product Certifications” on page 51. E6 includes G6 requirements. G6 is for use in unclassified, safe area locations only.
8. Not available for hand polished wet side.
9. Minimum length available for 3/4-in. threaded connection is 3.8 in. (95 mm); for 1-in. threaded, it is 3.7 in. (94 mm); for flanged, it is 3.5 in. (89 mm);
and for Tri Clamp, it is 4.1 in. (105 mm). Maximum length is 157.5 in. (4000 mm), except for ECTFE co-polymer coating and polished process where the maximum length
is 59.1 in. (1500 mm) and 39.4 in. (1000 mm) respectively. Examples: Code E1181 is 118.1 inches. Code M3000 is 3000 millimeters.
10. Only available for process-wetted parts.
11. Not available for Direct Load switching electronics.

12. Option limited to units with extended lengths up to 59.1-in. (1500 mm). Option is not available for ECTFE coating.
13. Available only for a Rosemount 2120 with a Tri Clamp fitting, Product Certification code NA, G*, or I*, and Surface Finish code 3, 4, 7, or 8.

00809-0100-4030, Rev FA December 2016
A.3.1 Spare parts and accessories
Spares and accessories Part number Spares and accessories
Seal for 1-in. BSPP (G1A). Seal for 3/4-in. BSPP (G3/4A)
Material: Non-asbestos BS7531 grade X carbon Material: Non-asbestos BS7531 grade X carbon
fiber with rubber binder fiber with rubber binder.
1.54 1.26
(39) (32)
02100-1000-0001 02100-1040-0001
1.30 1.04
(34) (26.5)
0.12 (3) 0.08 (2)
Adaptor boss 1-in. BSPP to Adjustable clamp gland for 1-in. extended
11/2-in. (38mm) Tri Clamp. lengths. It is not explosion proof.
Material: 316 SS fitting. FPM/FKM ‘O’ ring Material: 316 St. steel, (Si) Silicone rubber seal
1.20 1-in.
(30.5) Pmax = 1.3 barg
0.18 Tmax = 257°F (125°C)
(4.5) 1-in.
02100-1010-0001 BSPP 02120-2000-0001
11/2-in.
BSPP
2.36 1.54
(60) (39)
2-in. (51 mm) Tri Clamp kit including vessel Adjustable clamp gland for 1-in. extended
fitting, clamp ring, seal. lengths. It is not explosion proof.
Material: 316 St. steel, NBR Nitrile Material: 316 St. steel, (Si) Silicone rubber seal
1-in. Pmax = 1.3 barg
02100-1020-0001 Tmax = 257°F (125°C)
(1) 02120-2000-0002
11/2-in.
NPT
02100-1030-0001 Telescopic test magnet

Quick Release kit
02100-1060-0001 (includes 2-in. Tri Clamp, seal, and quick release
(1)(2) device for 2-in. NPT process connection)
Material: 316 stainless steel
Replacement Cassettes (for versions of the Rosemount 2120 shipped since June 2013)(3)(4)
02120-7000-0001(5) Replacement Cassette: Direct load switching (mains 2 wire) (Red)

02120-7000-0002 (5) Replacement Cassette: PNP/PLC, low voltage (Yellow)
02120-7000-0003(5) Replacement Cassette: NAMUR (Light Blue)
02120-7000-0004(5) Replacement Cassette: Relay (DPCO), standard version (Green)
02120-7000-0005(5) Replacement Cassette: 8/16 mA output (Dark Blue)
02120-7000-0007(5) Replacement Cassette: Relay (DPCO), 12 Vdc nominal version (Green)
1. This is not approved to be used with a 3-A or EHEDG approved products and is not assessed for use with FDA or ASME-BPE compliant products.
2. The Quick Release kit is a set of accessories requiring a Rosemount 2120 with the 2-in. Tri Clamp option and an existing 2-in. NPT process connection on the vessel.
For additional information, see Rosemount 2120 Quick Release kit – Quick Start Guide.
3. Check the Electronic Type and Product Certification sections in Table A-8 on page 46 for availability conditions.
4. Intrinsically Safe approved cassettes can only be replaced with the same type of IS cassette. Non-I.S. cassette types can be interchanged with other non-I.S. cassettes,
but the new label must be fitted and the original part number transferred to the new label.
5. This replacement cassette is for versions of the Rosemount 2120 shipped since June 2013.

Reference Manual Product Certifications
00809-0100-4030, Rev FA December 2016
Appendix B Product Certifications
Important B.6 NAMUR approval

Safety instructions specific to hazardous area installations are in
this Appendix, and in the Rosemount 2120 Quick Start Guide NAMUR NE95 type test is available upon request. Complies with
(available in other languages on Emerson.com/Rosemount). NAMUR NE21.
B.1 European directive information B.7 Ordinary location certifications

FM ordinary location certification
The EC declaration of conformity for all applicable European
directives for this product can be found at G5 Project ID: 3021776
Emerson.com/Rosemount. The switch has been examined and tested to determine that
the design meets basic electrical, mechanical, and fire
protection requirements by FM, a nationally recognized
B.2 Hygienic approvals & compliances testing laboratory (NRTL) as accredited by the Federal
(surface finish codes 3, 4, 7, and 8) Occupational Safety and Health Administration (OSHA)
3-A – Authorization 3496 CSA ordinary location certification
EHEDG – Certificate: 10216 G6 Certificate Number 06 CSA 1805769
ASME-BPE and FDA compliant The switch has been examined and tested to determine that
(See “Hygienic installations” on page 62 for safety instructions). the design meets basic electrical, mechanical, and fire
protection requirements by CSA, a nationally recognized
testing laboratory as accredited by the Standards Council of
B.3 Overfill approval Canada (SCC). Single seal.
Certificate number: Z-65.11-522.
TÜV-tested and approved for overfill protection according to the B.8 Canadian Registration Number
German DIBt/WHG regulations. Certified under safety devices for
Certificate Number CRN 0F04227.2C
tanks and piping related to water pollution control.
The requirements of CRN are met when a Rosemount 2120 CSA
IS-approved (G6, E6, or I6 option codes) vibrating fork level switch
B.4 Marine approvals model is configured with 316/316L stainless steel (1.4401/1.4404)
ABS – American Bureau of Shipping wetted parts and either NPT threaded or 2 to 8-in. ASME B16.5
GL – Germanischer Lloyd flanged process connections.
SRS – Russian Maritime Registered Shipping (RMRS)
B.9 Safety Integrity Level (SIL)
B.5 Drinking water approval The Rosemount 2120 has been independently certified to IEC
61508 as required by IEC 61511. Certification was conducted by
Rosemount Measurement Ltd. (United Kingdom) confirms that the
Exida. The Rosemount 2120 is SIL2-certified and SIL3-capable.
wetted parts of the Rosemount 2120 vibrating fork level switch are
suitable and approved for drinking water usage. The wetted parts
of the vibrating fork level switches executed in stainless steel
(option code D) and Alloy C / Alloy C-276 (option code C) with
flanged, NPT thread, BSPT(R) thread, or Tri-clamp process
connections, are in accordance with the requirements of DVGW*-
Worksheet W270.The materials used are classified as
toxicologically and microbiologically safe.
Product Certifications 51
00809-0100-4030, Rev FA December 2016
B.10 Hazardous locations certifications 7. If the equipment is likely to come into contact with
aggressive substances, it is the responsibility of the user to
B.10.1 American and Canadian approvals
take suitable precautions that prevent it from being
Factory Mutual (FM) explosion-proof approval adversely affected, thus ensuring that the type of protection
is not compromised.
E5 Project ID: 3012658
Aggressive substances – e.g. acidic liquids or gases that may
Explosion-proof for Class I, Div. 1, Groups A, B, C, and D attack metals or solvents that may affect polymeric
Temperature Class: T6 materials.
Enclosure: Type 4X Suitable precautions – e.g. regular checks as part of routine
inspections or establishing from the material’s data sheet
Canadian Standards Association (CSA) that it is resistant to specific chemicals.
explosion-proof approval The metallic alloy used for the enclosure material may be at
E6 Project ID: 1786345 the accessible surface of this equipment; in the event of rare
Explosion-proof for Class I, Div. 1, Groups A, B, C, and D accidents, ignition sources due to impact and friction sparks
could occur. This shall be considered when the Rosemount
Temperature Class: T6
2120 is installed in locations that specifically require Class 1,
Enclosure: Type 4X Div 1 equipment.
Single seal
8. It is the responsibility of the user to ensure:
Instructions for hazardous area installations (E5 and E6) a. The voltage and current limits for this equipment are
not exceeded.
Model numbers covered: b. That the joint requirements between the switch and
2120*****E5Y**, 2120*****E5T**, 2120*****E6Y**, the vessel tank are compatible with the process
2120*****E6T** (“*” indicates options in construction, function media.
and materials – see Table A-8 on page A-46). c. That the joint tightness is correct for the joint material
used.
The following instructions apply to equipment covered by CSA and d. That only suitable certified cable entry devices will be
FM explosion-proof approvals: used when connecting equipment.
e. That any unused entries are sealed with suitably
1. The equipment may be used with flammable gases and certified stopping plugs.
vapors with apparatus Class 1, Div 1, Groups A, B, C and D.
9. The switch fork is subjected to small vibration stresses as part
2. CSA and FM explosion-proof approved versions of the of its normal function. As this provides a partition wall, it is
Rosemount 2120 are certified for use in ambient recommended that the fork should be inspected every
temperatures of –40 °F to 176 °F (–40 °C to 80 °C), and with a two years for signs of defects.
maximum process temperature of 302 °F (150 °C).
10. Technical data:
3. Installation of this equipment shall be carried out by suitably
a. Coding: Class 1, Div 1, Groups A, B, C, and D
trained personnel, in accordance with the applicable code of
practice. b. Temperatures: See Table B-1.
4. Inspection and maintenance of this equipment shall be Table B-1. Temperatures (E5 and E6)
carried out by suitably trained personnel, in accordance with
the applicable code of practice. 2120*****E5Y**, 2120*****E5T**, 2120*****E6Y**,
2120*****E6T**:
5. The user should not repair this equipment.
Temperature Maximum ambient Maximum process
6. The certification of this equipment relies upon the following air temperature (Ta) temperature (Tp)
classes
materials used in its construction:
Body: T6, T5, T4, T3, T2, T1 75 °C 75 °C
Aluminum alloy (ASTM B85 360.0) or 316 stainless steel
T5, T4, T3, T2, T1 70 °C 95 °C
Cover:
Aluminum alloy (ASTM B85 360.0) or 316 stainless steel T4, T3, T2, T1 65 °C 125 °C
Probe: T3, T2, T1 50 °C 150 °C
316 stainless steel, or alloy C276 (UNS N10276) and
alloy C (UNS N10002) Minimum ambient air temperature (Ta) = –40 °C
Probe filling: perlite Minimum process temperature (Tp) = –40 °C
Cover seal: silicone
52 Product Certifications
Product Certifications Reference Manual
December 2016 00809-0100-4030, Rev FA
Control Drawing: 71097/1179 (with NAMUR electronics)

c. Pressure: Must not exceed the rating of the
coupling/flange fitted. (Figure B-3 on page 57)
d. For electrical details and pressure ratings, refer to Vmax=15 V, Imax=32 mA, Pi=0.1 W, Ci=211 nF, Li=0.06 mH
“Specifications” on page 35. Control Drawing: 71097/1315 (with 8/16 mA electronics)
e. Year of manufacture: Printed on product label. (Figure B-4 on page 58)
11. Cable selection Vmax=30 V, Imax=93 mA, Pi=0.65 W, Ci=12 nF, Li=0.035 mH
It is the responsibility of the user to ensure that suitably
temperature rated cable is used. Table B-2 is a guide to Instructions for hazardous (classified) area installations
selection. (I5 and I6)
Table B-2. Cable Selection (E5 and E6) Model numbers covered: 2120***H*I5A*, 2120***K*I5D*,
2120***H*I6A*, 2120***K*I6D*(“*” indicates options in
T Class Cable Temperature Rating
construction, function and materials – see Table A-8 on
T6 Above 185 °F (85 °C) page A-46).
T5 Above 212 °F (100 °C) The following instructions apply to equipment covered by CSA and
T4 Above 275 °F (135 °C) FM intrinsically safe and non-incendive approvals:
T3 Above 320 °F (160 °C) 1. The intrinsically safe approved Rosemount 2120 may be
used in hazardous locations with flammable gases and
vapors Class 1 Division 1 Groups A, B, C and D, and Class 1
Note Zone 0 Group IIC when installed in accordance with control
A certified isolating amplifier to IEC 60947-5-6 is required for drawings:
intrinsic safety if the NAMUR electronics is used in a hazardous area
71097/1154 (Figure B-1 on page 55)
installation (see below).
71097/1314 (Figure B-2 on page 56)
A certified intrinsically safe barrier is required for intrinsic safety if 71097/1179 (Figure B-3 on page 57)
the 8/16 mA electronics is used in a hazardous area installation 71097/1315 (Figure B-4 on page 58)
(see below).
2. The non-incendive approved Rosemount 2120 may be used
in hazardous locations with flammable gases and vapors
Factory Mutual (FM)
Class 1 Division 2 Groups A, B, C, and D when installed in
intrinsically safe and non-incendive approvals accordance with control drawings:
I5 Project ID: 3011456 71097/1154 (Figure B-1 on page 55)
Intrinsically Safe for Class I, Div. 1, Groups A, B, C, and D 71097/1314 (Figure B-2 on page 56)
Class I, Zone 0, AEx ia IIC 71097/1179 (Figure B-3 on page 57)
71097/1315 (Figure B-4 on page 58)
Non-incendive for Class I, Div. 2, Groups A, B, C, and D
Class I, Zone 2, IIC 3. The apparatus electronics is only certified for use in ambient
Temperature Code: T5 (See Control Drawings) temperatures in the range of –40 to +176 °F (–40 to +80 °C).
It should not be used outside this range. However, the switch
Control Drawing: 71097/1154 (with NAMUR electronics) may be located in the process medium which may be at a
(Figure B-1 on page 55) higher temperature than the electronics but must not be
Vmax=15 V, Imax=32 mA, Pi=0.1 W, Ci=211 nF, Li=0.06 mH higher than the Temperature Class for the respective process
gas/medium.
Control Drawing: 71097/1314 (with 8/16 mA electronics)
(Figure B-2 on page 56) 4. It is a condition of the Approval that the temperature of the
Vmax=30 V, Imax=93 mA, Pi=0.65 W, Ci=12 nF, Li=0.035 mH electronics housing is in the range of –40 °F to +176 °F (–40
to +80 °C). It must not be used outside this range. It will be
Canadian Standards Association (CSA) necessary to limit the external ambient temperature if the
intrinsically safe and non-incendive approvals process temperature is high. (See Technical Data below.)
I6 Certificate Number: 06 CSA 1786345 5. Suitably trained personnel shall carry out installation in
Intrinsically Safe for Class I, Div. 1, Groups A, B, C, and D accordance with the applicable code of practice.
Class I, Zone 0, Ex ia IIC 6. The user should not repair this equipment.
Non-incendive for Class I, Div. 2, Groups A, B, C, and D
Temperature Code: T5 (See Control Drawings)
Single Seal
00809-0100-4030, Rev FA December 2016
7. If the equipment is likely to come into contact with

adversely affected, thus ensuring that the type of protection
is not compromised.
Aggressive substances – e.g. acidic liquids or gases that may
attack metals or solvents that may affect polymeric
materials.
Suitable precautions – e.g. regular checks as part of routine
that it is resistant to specific chemicals.
8. If the enclosure is made of an alloy or plastic material, the

following precautions must be observed:
a. The metallic alloy used for the enclosure material may
be at the accessible surface of this equipment; in the
event of rare accidents, ignition sources due to
impact and friction sparks could occur.
b. Under certain extreme circumstances, the
non-metallic parts incorporated in the enclosure of
the Rosemount 2120 may generate an
ignition-capable level of electrostatic charge.
Therefore, when they are used for applications that
specifically require group II equipment, the
Rosemount 2120 shall not be installed in a location
where the external conditions are conducive to the
build-up of electrostatic charge on such surfaces.
Additionally, the Rosemount 2120 shall only be
cleaned with a damp cloth.
9. Technical Data:
a. I.S. Approval: Class 1 Division 1 Groups A, B, C, and D;
Class 1 Zone 0 AEx ia IIC
Non-incendive Approval: Class 1 Division 2 Groups A,
B, C, and D; Class I, Zone 2, IIC
b. Input parameters:
Rosemount 2120 with NAMUR electronics:
Vmax=15 V, Imax=32 mA, Pi=0.1 W, Ci=211 nF,
Li=0.06 mH
Rosemount 2120 with 8/16 mA electronics:
Vmax=30 V, Imax=93 mA, Pi=0.65 W, Ci=12 nF,
Li=0.035 mH
c. Temperature:
See Control Drawings:
71097/1154 (Figure B-1 on page 55)
71097/1314 (Figure B-2 on page 56)
71097/1179 (Figure B-3 on page 57)
71097/1315 (Figure B-4 on page 58)
d. Materials: See “Specifications” on page -35.

e. Year of manufacture: Printed in product label.
10 MOB-02714 41
2120***C*I***, 2120***K*I*** 2130N**E***********I5**

INTRINSICALLY SAFE APPARATUS
Temperature Classes Maximum Ambient Air Maximum Process Temperature Classes Maximum Ambient Air Maximum Process
HAZARDOUS LOCATION.
December 2016
Temperature (Ta) Temperature (Tp) Temperature (Ta) Temperature (Tp)

CLASS I, DIVISION 1 & 2, GROUPS A, B, C, D.
Product Certifications
T5, T4, T3, T2, T1 80°C 60°C T5, T4, T3, T2, T1 80°C 80°C
CLASS I, ZONES 0,1 & 2, GROUPS IIA, IIB, IIC. T4, T3, T2, T1 60°C 115°C T4, T3, T2, T1 77°C 115°C
T3, T2, T1 50°C 150°C T3, T2, T1 71°C 185°C
T2, T1 65°C 260°C
Minimum Ambient Air Temperature (Ta) = -40°C
Minimum Process Temperature (Tp) = -40°C Minimum Ambient Air Temperature (Ta) = -50°C
Minimum Process Temperature (Tp) = -70°C
ASSOCIATED APPARATUS 2130N**M***********I5**
TERMINAL 1 CABLE SEE NOTE 5 NON-HAZARDOUS LOCATION

Temperature Classes Maximum Ambient Air Maximum Process
APPROVED SINGLE CHANNEL NON-HAZARDOUS LOCATION Temperature (Ta) Temperature (Tp)
LOOP POWERED TRANSMITTER
TYPE: 2120/2130 ISOLATOR OR ONE CHANNEL UNSPECIFIED EXCEPT THAT T5, T4, T3, T2, T1 80°C 80°C
2120*****I*** OF A MULTI-CHANNEL IT MUST NOT BE SUPPLIED T4, T3, T2, T1 69°C 115°C
2130N**************I5** ISOLATOR WITH ENTITY FROM NOR CONTAIN UNDER T3, T2, T1 50°C 180°C
SEE TABLE 1 FOR ENTITY CONCEPT PARAMETERS NORMAL OR ABNORMAL
CONCEPT PARAMETERS. SEE NOTE 3. CONDITIONS A SOURCE OF Minimum Ambient Air Temperature (Ta) = -50°C
POTENTIAL WITH RESPECT Minimum Process Temperature (Tp) = -40°C
TO GROUND IN EXCESS OF
TERMINAL 2
SCREEN 250V RMS OR 250V DC.
EARTH AN I.S. SAFETY EARTH IS NOT
REQUIRED WHEN A GALVANIC ISOLATOR
IS USED. IN THIS CASE THE SCREEN
IF FITTED MAY BE EARTHED AT ONE
POINT ONLY OR NOT AT ALL. TABLE 1
UNIT ENTITY CONCEPT PARAMETERS CLI DIV1

NOTES:- CLI ZN0,1
1. INSTALLATION OF EQUIPMENT TO BE IN ACCORDANCE WITH NEC ARTICLES 504 DESCRIPTION VALUE

AND 505, AND ISA RP12.6 RECOMMENDED PRACTICE FOR INSTALLATION OF MAXIMUM INPUT VOLTAGE (Ui) 15V
INTRINSICALLY SAFE CIRCUITS. MAXIMUM INPUT CURRENT (Ii) 32mA
MAXIMUM INPUT POWER (Pi) 0.1W
2. THE ELECTRICAL CIRCUIT IN THE HAZARDOUS LOCATION MUST BE CAPABLE OF
INTERNAL CAPACITANCE (Ci) 211nF
WITHSTANDING AN A.C. TEST VOLTAGE OF 500V RMS TO GROUND OR THE FRAME
OF THE APPARATUS FOR 1 MINUTE. INTERNAL INDUCTANCE (Li) 0.06mH
3. THE ENTITY CONCEPT ALLOWS INTERCONNECTION OF INTRINSICALLY SAFE NONINCENDIVE FIELD WIRING PARAMETERS
APPARATUS NOT SPECIFICALLY EXAMINED IN COMBINATION AS A SYSTEM WHEN THE
APPROVED VALUES OF Uo (Voc ) AND Io (Ioc ) OF THE ASSOCIATED APPARATUS DESCRIPTION VALUE
ARE LESS THAN OR EQUAL TO Ui (Vmax ) AND Ii (Imax ) OF THE INTRINSICALLY
SAFE APPARATUS AND THE APPROVED VALUES OF Co AND Lo OF THE ASSOCIATED MAXIMUM INPUT VOLTAGE (Vmax) 15V
APPARATUS, ARE GREATER THAN THE TOTAL VALUES Ci AND Li OF ALL THE INTERNAL CAPACITANCE (Ci) 211nF
Figure B-1. FM Intrinsically Safe Control Drawing (NAMUR Electronics)
INTRINSICALLY SAFE APPARATUS INCLUDING ALL THE CABLE. INTERNAL INDUCTANCE (Li) 0.06mH
PRELIMINARY
4. FOR FURTHER INFORMATION REFER TO MANUAL:
2120 : 00809-0100-4030 A
2130 : 00809-0100-4130
5. CABLE CAPACITANCE AND INDUCTANCE PLUS THE I.S. APPARATUS UNPROTECTED

CAPACITANCE (Ci ) AND INDUCTANCE (Li ) MUST NOT EXCEED THE ALLOWED mb 25 X
CAPACITANCE (Co ) AND INDUCTANCE (Lo ) INDICATED ON THE ASSOCIATED APPARATUS.
6. SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC SAFETY. X X 0 ACAD FM INTRINSICALLY SAFE

CONTROL DRAWING 2120/2130
7. NON-INCENDIVE:-
INSTALLATION OF EQUIPMENT TO BE IN ACCORDANCE WITH NEC ARTICLES 501 & 505. 6.3
NON-INCENDIVE FIELD WIRING SHALL BE PERMITTED USING ANY OF THE WIRING METHODS 10 1/1
PERMITTED FOR UNCLASSIFIED LOCATION CERTIFIED PRODUCT. 71097/1154
ALTERATIONS TO THIS
DOCUMENT MUST BE APPROVED
BEFORE IMPLEMENTATION 1:1
Reference Manual
55
00809-0100-4030, Rev FA
56
3 MOB-02714 41
INTRINSICALLY SAFE APPARATUS
HAZARDOUS LOCATION.
CLASS I, DIVISION 1 & 2, GROUPS A, B, C, D.
2120***H*I*** 2130M**E***********I5**
CLASS I, ZONES 0,1 & 2, GROUPS IIA, IIB, IIC.
Temperature Classes Maximum Ambient Air Maximum Process Temperature Classes Maximum Ambient Air Maximum Process
Temperature (Ta) Temperature (Tp) Temperature (Ta) Temperature (Tp)
T5, T4, T3, T2, T1 80°C 60°C T5, T4, T3, T2, T1 80°C 80°C
T4, T3, T2, T1 60°C 115°C T4, T3, T2, T1 77°C 115°C
Reference Manual
T3, T2, T1 50°C 150°C T3, T2, T1 71°C 185°C

T2, T1 65°C 260°C
00809-0100-4030, Rev FA
Minimum Ambient Air Temperature (Ta) = -40°C

Minimum Process Temperature (Tp) = -40°C Minimum Ambient Air Temperature (Ta) = -50°C
Minimum Process Temperature (Tp) = -70°C
ASSOCIATED APPARATUS 2130M**M***********I5**
TERMINAL 1 CABLE SEE NOTE 5 NON-HAZARDOUS LOCATION

Temperature Classes Maximum Ambient Air Maximum Process
APPROVED SINGLE CHANNEL NON-HAZARDOUS LOCATION Temperature (Ta) Temperature (Tp)
LOOP POWERED TRANSMITTER
TYPE: 2120/2130 ISOLATOR OR ONE CHANNEL UNSPECIFIED EXCEPT THAT T5, T4, T3, T2, T1 80°C 80°C
2120*****I*** OF A MULTI-CHANNEL IT MUST NOT BE SUPPLIED T4, T3, T2, T1 69°C 115°C
2130M**************I5** ISOLATOR WITH ENTITY FROM NOR CONTAIN UNDER T3, T2, T1 50°C 180°C
SEE TABLE 1 FOR ENTITY CONCEPT PARAMETERS NORMAL OR ABNORMAL
CONCEPT PARAMETERS. SEE NOTE 3 & NOTE 7 CONDITIONS A SOURCE OF Minimum Ambient Air Temperature (Ta) = -50°C
POTENTIAL WITH RESPECT Minimum Process Temperature (Tp) = -40°C
TO GROUND IN EXCESS OF
TERMINAL 2
SCREEN 250V RMS OR 250V DC.
EARTH AN I.S. SAFETY EARTH IS NOT
REQUIRED WHEN A GALVANIC ISOLATOR
IS USED. IN THIS CASE THE SCREEN
IF FITTED MAY BE EARTHED AT ONE
POINT ONLY OR NOT AT ALL. TABLE 1
UNIT ENTITY CONCEPT PARAMETERS CLI DIV1

CLI ZN0,1
DESCRIPTION VALUE
NOTES: MAXIMUM INPUT VOLTAGE (Ui) 30V
MAXIMUM INPUT CURRENT (Ii) 93mA
1. INSTALLATION OF EQUIPMENT TO BE IN ACCORDANCE WITH NEC ARTICLES 504
MAXIMUM INPUT POWER (Pi) 0.65W
AND 505, AND ISA RP12.6 RECOMMENDED PRACTICE FOR INSTALLATION OF
INTRINSICALLY SAFE CIRCUITS. INTERNAL CAPACITANCE (Ci) 12nF
INTERNAL INDUCTANCE (Li) 0.035mH
2. THE ELECTRICAL CIRCUIT IN THE HAZARDOUS LOCATION MUST BE CAPABLE OF
WITHSTANDING AN A.C. TEST VOLTAGE OF 500V RMS TO GROUND OR THE FRAME NONINCENDIVE FIELD WIRING PARAMETERS
OF THE APPARATUS FOR 1 MINUTE.
3. THE ENTITY CONCEPT ALLOWS INTERCONNECTION OF INTRINSICALLY SAFE DESCRIPTION VALUE

APPARATUS NOT SPECIFICALLY EXAMINED IN COMBINATION AS A SYSTEM WHEN THE MAXIMUM INPUT VOLTAGE (Vmax) 30V
APPROVED VALUES OF Uo (Voc ) AND Io (Ioc ) OF THE ASSOCIATED APPARATUS INTERNAL CAPACITANCE (Ci) 12nF
ARE LESS THAN OR EQUAL TO Ui (Vmax ) AND Ii (Imax ) OF THE INTRINSICALLY INTERNAL INDUCTANCE (Li) 0.035mH
Figure B-2. FM Intrinsically Safe Control Drawing (8/16 mA electronics)
SAFE APPARATUS AND THE APPROVED VALUES OF Co AND Lo OF THE ASSOCIATED

APPARATUS, ARE GREATER THAN THE TOTAL VALUES Ci AND Li OF ALL THE
INTRINSICALLY SAFE APPARATUS INCLUDING ALL THE CABLE.
PRELIMINARY
4. FOR FURTHER INFORMATION REFER TO MANUAL: A
2120 : 00809-0100-4030
2130 : 00809-0100-4130
5. CABLE CAPACITANCE AND INDUCTANCE PLUS THE I.S. APPARATUS UNPROTECTED

CAPACITANCE (Ci ) AND INDUCTANCE (Li ) MUST NOT EXCEED THE ALLOWED GP 38 X
CAPACITANCE (Co ) AND INDUCTANCE (Lo ) INDICATED ON THE ASSOCIATED APPARATUS.
X X 0 ACAD FM INTRINSICALLY SAFE
6. SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC SAFETY. CONTROL DRAWING 2120/2130
7. NON-INCENDIVE:-
8/16mA
INSTALLATION OF EQUIPMENT TO BE IN ACCORDANCE WITH NEC ARTICLES 501 & 505. 6.3
NON-INCENDIVE FIELD WIRING SHALL BE PERMITTED USING ANY OF THE WIRING METHODS 3 1/1
PERMITTED FOR UNCLASSIFIED LOCATION CERTIFIED PRODUCT. 71097/1314
THE ISOLATOR CAN BE REPLACED BY A REGULATED POWER SOURCE ALTERATIONS TO THIS
DOCUMENT MUST BE APPROVED
BEFORE IMPLEMENTATION 1:1
December 2016
December 2016 00809-0100-4030, Rev FA
Figure B-3. CSA Intrinsically Safe Control Drawing (NAMUR Electronics)
00809-0100-4030, Rev FA December 2016
Figure B-4. CSA Intrinsically Safe Control Drawing (8/16 mA Electronics)
December 2016 00809-0100-4030, Rev FA
B.10.2 European approvals

ATEX flameproof approvals aggressive substances, it is the responsibility of the user to
E1 Certificate: Sira 05ATEX1129X
Flameproof and dust-proof: is not compromised.
ATEX Marking II 1/2 G D Aggressive substances: e.g. acidic liquids or gases that may
Ex db IIC T6...T2 Ga/Gb, Ex tb IIIC T85 °C...T265 °C Db attack metals, or solvents that may affect polymeric
materials
Instructions specific to hazardous area installations (E1 and E7)
Suitable precautions: e.g. regular checks as part of routine
Model numbers covered: inspections or establishing from the material’s data sheet
2120*****E1X**, 2120*****E1S**, 2120*****E7X**, that it is resistant to specific chemicals
2120*****E7S** (“*” indicates options in construction, function 10. It is the responsibility of the user to ensure:
and materials – see Table A-8 on page A-46). a. The voltage and current limits are not exceeded.
b. That the joint requirements between the probe and
The following instructions apply to the equipment covered by
the vessel tank are compatible with the process
certificates Sira 05ATEX1129X and IECEx SIR 06.0051X: media.
1. The equipment may be used with flammable gases and c. That the joint tightness is correct for the joint material
used.
vapors with apparatus groups IIA, IIB, and IIC, and with
temperature classes T1, T2, T3, T4, T5, and T6. d. That only suitably certified cable entry devices will be
The temperature class of the installation will be determined utilized when connecting this equipment.
from the higher of the process or ambient temperature. e. That any unused cable entries are sealed with suitably
certified stopping plugs.
2. The equipment may be used in a hazardous area with
explosive dusts with apparatus groups IIIC, IIIB, and IIIA. 11. The probe fork is subjected to small vibration stresses as part
The maximum surface temperature of the installation will be of its normal function. As this provides a partition wall, it is
determined from the higher of the process or ambient recommended that the fork should be inspected every 2
temperature. years for signs of defects.
3. The equipment is suitable for installation across the 12. Technical data
boundary between an area that specifically requires a. Coding
Equipment Protection Level Ga (Zone 0) and an area that ATEX:
specifically requires Equipment Protection Level Gb or Db II 1/2 G D, Ex db IIC T6...T2 Ga/Gb,
(Zone 1 or 21). The probe forks (and extension tube) only to Ex tb IIIC T85°C...T265°C Db
be installed in Zone 0. IECEx:
Ex db IIC T6...T2 Ga/Gb,
4. The equipment has not been assessed as a safety related
Ex tb IIIC T85°C...T265°C Db
device (as referred to by directive 94/9/EC (2014/34/EU)
Annex II, clause 1.5). b. Temperature: See Table B-3.
5. Installation of this equipment shall be carried out by suitably Table B-3. Temperatures (E1 and E7)
trained personnel, in accordance with the applicable code of
practice. 2120*****E1X**, 2120*****E1S**, 2120*****E7X**,
2120*****E7S**
6. Inspection and maintenance of this equipment shall be
carried out by suitably trained personnel, in accordance with Maximum Maximum
Temperature classes and
the applicable code of practice. ambient air process
maximum surface
temperature temperature
7. The user should not repair this equipment. Repair or temperature (T) (Ta) (Tp)
modification of flame-paths is not permitted.
T6, T5, T4, T3, T2, T1 T85 °C 75 °C 75 °C
8. The certification of this equipment relies upon the following
materials used in its construction: T5, T4, T3, T2, T1 T100 °C 70 °C 90 °C
Housing and cover: T4, T3, T2, T1 T135 °C 65 °C 125 °C
Aluminum alloy (ASTM B85 360.0) or stainless steel 316C12
T3, T2, T1 T160 °C 50 °C 150 °C
Probe (partition wall): Stainless steel 316L or 316/316L, or
Alloy C276 (UNS N10276) and Alloy C (UNS N10002 or
Minimum ambient air temperature (Ta) = –40 °C
N30002)
Probe filling: perlite Minimum process temperature (Tp) = –40 °C
Cover seal: silicone
00809-0100-4030, Rev FA December 2016
ATEX intrinsically safe approval

c. Pressure: Must not exceed the rating of the
coupling/flange fitted. I1 Certificate: Sira 05ATEX2130X
d. For electrical details and pressure ratings, refer to Intrinsically Safe for gas and dust environments:
“Specifications” on page 35. ATEX Marking II 1 G D
e. Year of manufacture: Printed on product label. Ex ia IIC T5...T2 Ga
13. Cable selection Ex ia IIIC T85°C...T265°C Da
It is the responsibility of the user to ensure that suitably
temperature rated cable is used. Note that the cable entry Note
temperature may exceed 70 °C. A certified isolating amplifier to IEC 60947-5-6 is required for
Table B-4 is a guide to selection. intrinsic safety if the NAMUR electronics is used in a hazardous area
installation.
Table B-4. Cable Selection (E1 and E7)
A certified intrinsically safe barrier is required for intrinsic safety if
T Class Cable temperature rating the 8/16 mA electronics is used in a hazardous area installation.
T6 Above 85 °C
T5 Above 100 °C
Instructions specific to hazardous area installations (I1 and I7)
T4 Above 135 °C
Model numbers covered:
T3 Above 160 °C
2120***H*I1**, 2120***C*I1**, 2120***K*I1**
14. Special conditions of use 2120***H*I7**, 2120***C*I7**, 2120***K*I7*
a. The user is to ensure the probe assembly is installed in (“*” indicates options in construction, function and materials – see
such a way to prevent any damage due to impact or Table A-8 on page 46)
ignition source due to friction.
b. Under certain extreme circumstances, a The following instructions apply to the equipment covered by
non-standard paint on the enclosure of the certificates numbered Sira 05ATEX2130X and IECEx Sir
Rosemount 2120 may generate an ignition-capable 06.0070X:
level of electrostatic charge. Therefore, the
Rosemount 2120 shall not be installed in a location 1. The Intrinsically Safe approved versions of the 2120 may be
where the external conditions are conducive to the used in a hazardous area with flammable gases and vapors
build-up of electrostatic charge on such surfaces. with apparatus groups IIC, IIB, and IIA, and with temperature
Additionally, the Rosemount 2120 shall only be classes T1, T2, T3, T4, and T5 [IECEx: in Zones 0, 1, and 2].
cleaned with a damp cloth.
The temperature class of the installation will be determined
c. The user is to ensure the ambient air temperature (Ta)
from the higher of the process or ambient temperature.
and the process temperature (Tp) are within the
range detailed above for the T class of the specific 2. The equipment may be used in a hazardous area with
flammable gases or vapors present. explosive dusts with apparatus groups IIIC, IIIB, and IIIA
d. The user is to ensure the ambient air temperature (Ta) [IECEx: in Zones 20, 21, and 22].
and the process temperature (Tp) are within the The maximum surface temperature of the installation will be
range detailed above for the maximum surface
determined from the higher of the process or ambient
temperature of the specific flammable dusts present.
temperature.
3. It is a special condition of the certification that the
temperature of the electronics housing is in the range of
–50 to +80 °C. It must not be used outside this range. It will
be necessary to limit the external ambient temperature if the
process temperature is high. (See “Technical Data” below).
4. Suitably trained personnel shall carry out installation in
accordance with the applicable code of practice.
5. The user should not repair this equipment.
is not compromised.
December 2016 00809-0100-4030, Rev FA
Aggressive substances: e.g. acidic liquids or gases that may

c. Ensure the ambient air temperature (Ta) and the
attack metals or solvents that may affect polymeric
process temperature (Tp) are within the range
materials. detailed above for the maximum surface
Suitable precautions: e.g. regular checks as part of routine temperature of the specific flammable dusts present.
10. Manufacturer
that it is resistant to specific chemicals.
Rosemount Measurement Limited, 158 Edinburgh Avenue,
Slough, Berkshire, SL1 4UE, United Kingdom.
7. The Rosemount 2120 meets the requirements of
clause 6.3.12 (Isolation of circuits from earth or frame) in
EN 60079-11 (IEC 60079-11). Table B-5. Temperatures (I1 and I7)
8. Technical Data 2120***H*I1**, 2120***H*I7**

a. Coding:
ATEX: Gas (Ga)
II 1 G D, Ex ia IIC T5...T2 Ga,
Ex ia IIIC T85 °C...T265 °C Da Maximum Maximum
IECEx: Temperature Ambient Air Process
Ex ia IIC T5...T2 Ga Classes Temperature Temperature
Ex ia IIIC T85 °C...T265 °C Da (Ta) (Tp)
b. Temperature: See Table B-5 on page 61. T5, T4, T3, T2, T1 80 °C 60 °C
c. Input parameters
T4, T3, T2, T1 60 °C 115 °C
Rosemount 2120 with NAMUR electronics: Ui =15 V,
Ii = 32 mA, Pi = 0.1 W, Ci = 12 nF, Li = 0.06 mH T3, T2, T1 50 °C 150 °C
Rosemount 2120 with 8/16 mA electronics: Ui = 30 V,
Ii = 93 mA, Pi = 0.65 W, Ci = 12 nF, Li = 0.035 mH 2120***H*I1**, 2120***H*I7**
d. Materials: See “Specifications” on page 35.
Dust (Da)
e. Year of manufacture: printed on product label
Maximum Maximum Maximum
9. Special conditions of use
Temperature Surface Ambient Air Process
a. If the enclosure is made of an alloy or plastic material, Classes Temperature Temperature Temperature
the following precautions must be observed: (T) (Ta) (Tp)
(i) The metallic alloy used for the enclosure material
may be at the accessible surface of this equipment; in T5, T4, T3, T2, T1 T85 70 °C 60 °C
the event of rare accidents, ignition sources due to T4, T3, T2, T1 T120 60 °C 115 °C
impact and friction sparks could occur. This shall be
considered when the Rosemount 2120 is being T3, T2, T1 T155 50 °C 150 °C
installed in locations that specifically require Minimum ambient air temperature (Ta) = –40 °C.
Equipment Protection Level Ga or Da [ATEX: group II,
category 1G equipment] [IECEx: in Zone 0 and 20 Minimum process temperature (Tp) = –40 °C
locations].
(ii) Under certain extreme circumstances, the 2120***K*I1**, 2120***K*I7**
non-metallic parts incorporated in the enclosure of Gas (Ga) and Dust (Da)
the Rosemount 2120 may generate an
ignition-capable level of electrostatic charge. Maximum Maximum Maximum
Therefore, when they are used for applications that Temperature Surface Ambient Air Process
specifically require Equipment Protection Level Ga or Classes Temperature Temperature Temperature
Da [ATEX: group II, category 1G equipment] [IECEx: (T) (Ta) (Tp)
in Zone 0 and 20 locations], the Rosemount 2120
shall not be installed in a location where the external T5, T4, T3, T2, T1 T85 °C 80 °C 60 °C
conditions are conducive to the build-up of T4, T3, T2, T1 T120 °C 60 °C 115 °C
electrostatic charge on such surfaces. Additionally,
the Rosemount 2120 shall only be cleaned with a T3, T2, T1 T155 °C 50 °C 150 °C
damp cloth.
Minimum ambient air temperature (Ta) = –40 °C
b. Ensure the ambient air temperature (Ta) and the
process temperature (Tp) are within the range Minimum process temperature (Tp) = –40 °C
detailed above for the T class of the specific
flammable gases or vapors present.
00809-0100-4030, Rev FA December 2016
B.10.3 International approvals B.11 Hygienic installations

International Electrotechnical Commission (IEC) The following instructions apply to a Rosemount 2120 Level Switch
flameproof and dust-proof approval (“level switch”) with a 38 mm or 51 mm Tri Clamp fitting covered
E7 Certificate: IECEx SIR 06.0051X by 3-A Authorization 3496, EHEDG certificate 10216, and
Flameproof and dust-proof: ASME-BPE and FDA compliance:
Ex db IIC T6...T2 Ga/Gb
1. The level switch is suitable for installation on pipeline (with
Ex tb IIIC T85 °C...T265 °C Db fork gap in line with the flow) and on closed vessels (with the
See also “Instructions specific to hazardous area installations fork gap vertical).
(E1 and E7)” on page 59. EHEDG only recommend horizontal stub mounting in
pipelines:
International Electrotechnical Commission (IEC)
intrinsically safe approval
I7 Certificate: IECEx SIR 06.0070X OK
Intrinsically Safe for gas and dust environments:
Ex ia IIC T5...T2 Ga
Ex ia IIIC T85 °C...T265 °C Da
See also “Instructions specific to hazardous area installations
(I1 and I7)” on page 60.
Note
A certified isolating amplifier to IEC 60947-5-6 is required for
intrinsic safety if the NAMUR electronics is used in a hazardous area
installation (see below).
A certified intrinsically safe barrier is required for intrinsic safety if
the 8/16 mA electronics is used in a hazardous area installation
(see below). OK
Technical Regulation Customs Union (EAC)
flameproof approval
EM Certificate: TC RU C-GB.BH02.B.00175
(Housing codes X and S only)
Markings:
1Exd IIC T6 X (-40 °C  Ta  +75 °C);
1Exd IIC T5 X (-40 °C  Ta  +70 °C);
1Exd IIC T4 X (-40 °C  Ta  +65 °C);
1Exd IIC T3 X (-40 °C  Ta +50 °C);
See certificate for special conditions for safe use (X)
2. Installation of the level switch shall be carried out by suitably
Technical Regulation Customs Union (EAC) trained personnel, in accordance with the applicable
intrinsically safe approvals standards and code of practice.
IM Certificate: TC RU C-GB.BH02.B.00175 3. Inspection and maintenance of the level switch shall be
(NAMUR and 8/16 mA electronics only) carried out by suitably trained personnel, in accordance with
Markings: the applicable standards and code of practice.
0Exia IIC T5 X (-40 °C  Ta  +80 °C);
4. If the level switch is installed in a stub then, to ensure
0Exia IIC T4 X (-40 °C  Ta  +60 °C); clean-ability, the length (L) must not exceed the diameter (D)
0Exia IIC T3 X (-40 °C  Ta  +50 °C) with a minimum diameter of 46 mm.
See certificate for special conditions for safe use (X) If the stub diameter is < 46 mm then L < 2 * (D - 23).
December 2016 00809-0100-4030, Rev FA
5. The certification of the level switch relies upon the following

materials used in its construction:
a. Product contact surfaces:
Probe:
Stainless steel 316/316L
b. Non-product contact surfaces:
Enclosure (metal):
Aluminum alloy ASTM B85 360.0 or ANSI AA360.0
Enclosure (plastic):
Glass-filled (30%) nylon 66
Seals:
Silicone, nitrile rubber and polyethylene
Cable entry devices:
Nylon (PA6)
6. It is the responsibility of the user to ensure:
a. The materials listed in instruction 5 are suitable for
the media and cleaning (sanitizing) processes.
b. The installation of the level switch is drainable and
cleanable.
c. That the joint requirements between the probe and
the vessel/pipe are compatible with the process
media, applicable standards and code of practice.
In EHEDG applications, the seals (gaskets) used shall
be defined as in the EHEDG position paper “Easy
cleanable pipe couplings and process connections”.
d. That only suitable cable entry devices will be utilized
when connecting the level switch to maintain IP66.
e. That any unused cable entries are sealed with suitable
stopping plugs to maintain IP66.
7. The Rosemount 2120 is suitable for Cleaning-In-Place (CIP)
up to 160 °F (71 °C).
8. The Rosemount 2120 is suitable for Steaming-In-Place (SIP)
up to 275 °F (135 °C).
00809-0100-4030, Rev FA December 2016
Reference Manual
00809-0100-4030, Rev FA
December 2016
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Emerson Automation Solutions Standard Terms and Conditions of Sale can be found at:
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Reference Manual

Rosemount™ 2120 Level Switch

3Section 3: Service and Troubleshooting

4Appendix A: Specifications and Reference Data

5Appendix B: Product Certifications

Rosemount™ 2120 Level Switch

Electrical shock can result in death or serious injury.

Any substitution of non-recognized parts may jeopardize safety and is under no

1.1 Using this manual

 Section 2: Installation contains mechanical and electrical installation instructions.

1.2 Models covered

1.3 Level switch overview

Figure 1-1. Rosemount 2120 Application Examples

High and low level alarm

Pump control (limit detection)

Pump protection or empty pipe detection

1.3.2 Measurement principle

1.3.3 Short fork technology

Figure 1-2. Rosemount 2120 Features

1.3.4 Special features

Mode switch and adjustable time delay

Magnetic test point

1.4 Product recycling and disposal

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

2.1 Safety messages

External surfaces may be hot.

2.2 Considerations before installation

2.2.1 Safety considerations

2.2.2 Environmental considerations

Figure 2-1. Environmental Considerations

2.2.3 Application considerations

Figure 2-2. Avoid Product Build-up

Figure 2-3. Switching Points

SP: Switching point (H20)

2.2.4 Installation considerations

Allow adequate space outside tank or pipe

Fit the cover correctly

Grounding on metal housings

Do not change the level switch

Figure 2-4. Do Not Change the Level Switch Fork

How to handle the level switch

Figure 2-5. Handling the Rosemount 2120

2.2.5 Installation recommendations

Figure 2-6. Required Supports for Extended Fork (Standard)

Figure 2-7. Required Supports for Extended Forks (Marine GL Approval)

2.2.6 Installation examples

Figure 2-9. Pump Control or Overfill Protection

Figure 2-10. Pump or Empty Pipe Protection

2.3 Installation procedures

2.3.2 Correct fork alignment

Figure 2-12. Correct Fork Alignment

A. Alignment groove on standard length Rosemount 2120

2.3.3 Tightening the threaded level switch

A. 3.9 in. (100 mm) clearance all around

2.4 Setting the mode switch and switching time delay

Figure 2-17. Top-down View: Example Cassette Inside Housing

OPERATION MODE PLC/PNP

1 2 3 4 Wet On Mode Seconds Delay

A. Mode “Dry On”