Kobold KDM Flowmeter Datasheet - Man
Kobold KDM Flowmeter Datasheet - Man
Kobold KDM Flowmeter Datasheet - Man
User Instructions
Contents
1.0 General 1
2.0 Specifications 1
3.0 Installation Instructions 6
3.1 Flowmeter Installation 6
3.2 Electrical Connections 8
4.0 Operation 12
4.1 Prevention of Mechanical Damage Due to Water Hammer 12
4.2 Flow Switch Adjustment 12
4.3 Correction Factors for Compressed Gas Service 13
5.0 Maintenance 14
5.1 Metering Tube Cleaning 14
6.0 Arrival of Damaged Goods 14
7.0 Need Help With Your Flowmeter? 14
List of Tables
Table 2.1 Dimensions 3
Table 2.2 Available Flow Ranges 4
Table 2.3 Model Number Information 5
Table 2.4 Temperature Limits With Options 6
Table 3.1 Flange Installation Data 7
List of Diagrams
Diagram 1.1 Principle of Operation 1
Diagram 2.1 Dimensions 3
Diagram 3.1 Limit Switch Connections 8
Diagram 3.2 Analog Transmitter Electrical Connections 10
Diagram 3.3 Totalizer Module 11
Diagram 3.4 Wiring for 4-20 mA Transmitter and Totalizer 11
Diagram 4.1 Switch Adjustment 12
Diagram 4.2 Gas Correction Factor Equation 13
FM Rev. 8/10/06
KDM
CAUTION: For safety reasons, please read the cautionary information located at
the end of the manual, before attempting installation.
1.0 General
The KOBOLD KDM series flowmeters operate on the variable area principle and are suitable for
measuring the volumetric flowrate of liquids and gases. This method of flow measurement
employs a tapered tube with internal float. The height at which the float rises to equilibrium in the
tube is dependent on rate of flow. The float is magnetically linked to an external indicator which is
isolated from the process media.
This flowmeter is equipped with a non-linearized, mechanical indicator. The M9 pointer indicator
is magnetically coupled to the float assembly.
In addition to the mechanical indicator, adjustable proximity type flow switches and analog
current transmitters can be provided.
2.0 Specifications
Accuracy:
Metal Versions: ±1.6% of full scale flow
PTFE Version: ±2.5% of full scale flow
Fittings: ANSI Flanges, 150 or 300 lb RF
NPT Thread (models to 2 inch)
Wetted Parts:
Standard: 316 Ti. Stainless Steel
As Options: PTFE Clad Stainless Steel/Ceramic or
Hastelloy C4
With Pulsation Dampener: Sapphire
FM Rev. 8/10/06
KDM 2
Totalizing Display
Type: 6 Digit LED, resettable
Power Requirement: Loop powered by analog output loop
(Not available with intrinsically safe analog output)
FM Rev. 8/10/06
3 KDM
7.1”
L
L1
11.8” Threaded
9.8” flanged
5.4”
FM Rev. 8/10/06
KDM 4
* Stated ranges are for stainless steel and Hastelloy C measuring tubes for water and air flows at
standard conditions. Most ranges are considerably reduced for PTFE-lined versions. Contact
KOBOLD for available ranges based upon your operating conditions.
FM Rev. 8/10/06
5 KDM
Medium
-W = Water
-L = Air
-A = Other
Measuring Range
-(1-26) = Measuring range code as chosen
from available ranges
Indicator Type
Output Options
-A0 = Indicator Only
-H0 = 1 Standard Switch
-HE = 1 Intrinsically Safe Switch
-I0 = 2 Standard switches
-IE = 2 Intrinsically Safe Switches
-L0 = Standard Analog Output
-LE = Instrinsically Safe Analog Output
-K0 = Standard Analog Output w/ Digital
Counter (M9 indicator only)
Other Options
D = Dampening Mechanism
T = Temperature Isolation
H = Steam Jacket
FM Rev. 8/10/06
KDM 6
Note: The defined maximum temperature limits are invalidated unless the following conditions are
met:
• The flowmeter is mounted in its “as designed” position.
• The flowmeter is not exposed to a radiant heat source (e.g. sunlight, adjacent hot
equipment).
• Pipe insulation does not obstruct free ventilation of the indicator housing.
Consult factory for temperature limits for hazardous location service or service with optional
heating jacket.
3.0 Installation Instructions
Warning: To minimize the possibility of damage during installation, only experienced
personnel, familiar with these installation and operating instructions, should install this
device.
FM Rev. 8/10/06
7 KDM
3.1.4 In order to prevent damage to the flowmeter caused by water hammer, the
flowmeter should be kept filled with fluid at all times. To achieve this, locate
shut off and control valves down stream of the flowmeter. If fluid can back flow
out of the meter when the system is shut down, a check valve should be
installed upstream of the flowmeter.
3.1.5 The pipeline must be rigidly supported at the inlet and outlet of the flowmeter.
This will prevent axial stresses which can be exerted on the flowmeter by the
weight of the fluid-filled pipe. It will also prevent cyclic stresses caused by pipe
vibration.
3.1.6 Flowmeters for compressed gas service are calibrated for a specific operating
pressure at the outlet of the flowmeter. This pressure is stamped on the
indicator. In order to ensure an accurate reading, this pressure must be
maintained at the flowmeter outlet at all times. If pressure fluctuations are
likely, a pressure regulating valve should be installed.
3.1.7 Flange bolts and gaskets are to be supplied by the customer. Select bolts and
gaskets in keeping with the flange pressure/temperature ratings and, in the
case of gaskets, chemical compatibility with the process media must be taken
into consideration. Table 3.1 gives flange bolt dimensions and torque ratings
for available flange sizes. Table 3.1 also gives the maximum torque rating for
stud bolts on PTFE-lined units. In order to prevent deformation of the PTFE
lining which is folded over the flange face, these torque ratings must not be
exceeded.
Nominal Size (ANSI B 16.5 Flanges) Stud Bolt Dimensions Maximum Torque
for PTFE Lined
Meters
(ft.-lb)
FM Rev. 8/10/06
KDM 8
FM Rev. 8/10/06
9 KDM
IMPORTANT: Refer to KOBOLD control drawings: KDM-IS100 and KDM-NI200 for additional
information.
The following electrical characteristics are relevant for the limit switches when installed in
hazardous locations:
Output Type: NAMUR per DIN 19234
Current Consumption:
Activated: > 3 mA
Not Activated: < 1 mA
FM Rev. 8/10/06
KDM 10
15
12.7
35 100 300 500 700 900
Max. Loop Resistance (Ohms)
IMPORTANT: Refer to KOBOLD control drawings KDM-IS100 and KDM-NI200 for additional
information.
IMPORTANT: Flowmeter installation in hazardous locations limits the allowable ambient and
process temperatures. If the process temperature is expected to be > 185°F or if the
ambient temperature is expected to be > 100°F, consult KOBOLD Instruments for the
maximum temperature limits prior to ordering and installation.
The PTB certification is valid for compressed gases only if the gas is non-explosive and the
flowmeter is included in periodic piping pressure tests.
FM Rev. 8/10/06
11 KDM
Push buttons which can be accessed by removing the indicator cover perform the following functions:
Totalizer Module
+ 4-20 mA transmitter module
Power -
14-30 VDC
+
-
Note 1: The totalizer module supplies power to the 4-20 mA transmitter module. The 4-20 mA signal is
then repeated at terminals 12 and 13 for use by the customer.
Note 2: if the 4-20 mA transmitter will not be used, a jumper must be placed between pins 12 and 13 in
order to allow the totalizer to function alone.
Caution: The totalizer module is not intrinsically safe. It cannot be used in hazardous locations
FM Rev. 8/10/06
KDM 12
4.0 Operation
FM Rev. 8/10/06
13 KDM
Sc Pa + 14.7 Tc + 460
FTrue = FIndicated X X X
Sa Pc + 14.7 Ta + 460
Where:
FTrue = True (corrected) gas flow rate
FIndicated = Indicated meter reading
Sa = Actual specific gravity of the fluid being measured
Sc = Specific gravity for which the meter is calibrated
Pa = Actual gas pressure at the meter outlet in PSIG
Pc = Calibrated gas pressure marked on the meter indicator
Tc = Calibrated gas temperature marked on the meter indicator
Ta = Actual gas temperature at the meter in °F
Example:
A flowmeter is calibrated for air flow at 100 PSIG and 70°F. The flowmeter is used to measure
nitrogen flow at 50 PSIG and 60°F. The indicated flow rate is 100 SCFM. What is the true
nitrogen gas flow under these changed conditions (the specific gravity of nitrogen is 0.97)?
FM Rev. 8/10/06
KDM 14
5.0 \Maintenance
This flowmeter normally requires no maintenance. Periodic cleaning of the metering tube inter-
nals may be required if a buildup of dirt or other deposits occurs over time. Adding a filter
upstream of the meter will minimize this problem.
FM Rev. 8/10/06
15 KDM
CAUTION
FM Rev. 8/10/06
KDM 16
FM Rev. 8/10/06
17 KDM
FM Rev. 8/10/06
KDM 18
• While Operating the Flow System: During operation, there are a number
of situations to avoid:
a.) The sudden cessation of fluid flow causes what is typically referred to
as "water hammer". Most people are familiar with this phenomenon from
their home experience - it is the cause behind the loud clank of water pipes
which occurs when faucets are turned off too suddenly. The cause behind
this "water hammer" is quite easy to visualize. Water is fairly massive. The
amount of water in long runs of pipe is quite substantial. When the faucets
are turned off suddenly, especially from a full on condition, the water has
considerable momentum and does not want to stop flowing. The situation
is similar to stopping a car by running into a wall, rather than by applying
brakes. Both are sudden rather than gradual. The damage to the wall can
be substantial (not to mention the car).
b.) The "water hammer" causes surges in fluid pressure which could cause
the measurement instrument's pressure limit to be exceeded, resulting in
failure and possible personal injury.
c.) Fluid surges, as well as the water hammer, can be particularly
damaging to empty flowmeters since there is no back pressure in the
device. The damage is caused, once again, by momentary excess
pressure. To avoid these surges, fluid lines should remain full (if possible)
and water flow should be introduced to the device slowly.
d.) If the instrument is isolated with inlet and outlet valves, the flowmeter
must be completely drained when said valves are both closed. Failure to
do so could result in damage to the device caused by thermal expansion of
fluid.
e.) Freezing of water in the instrument must be avoided since the resultant
expansion will damage the flowmeter and make it unsafe for use.
• Wiring and Electrical: Section 2.0, Specifications and Section 3.0,
Electrical Connections, provide the voltage and current limitations and the
wiring for the various sensor types. The sensor electrical ratings should
never be exceeded. Electrical wiring of the sensor should be performed in
accordance with all applicable national, state and local codes.
• Temperature and Pressure: Section 2.0, Specifications, provides the
temperature and pressure limits for each model. Operation outside these
limitations will cause damage to the unit and can potentially cause personal
injury. Fluid should never be allowed to freeze inside the sensor.
• Make a Fail-safe System: Design a fail-safe system that accommodates
the possibility of switch or power failure. In critical applications, KOBOLD
recommends the use of redundant backup systems and alarms in addition
to the primary system.
FM Rev. 8/10/06