Messko MTO Oil Level Indicator For Transformers

MESSKO® MTO
OIL LEVEL INDICATOR

FOR TRANSFORMERS.
WW W.R EIN HAU S EN.COM
MESSKO ® MTO
MESSKO® MTO – OIL LEVEL INDICATOR

FOR PRECISE OIL LEVEL MEASUREMENT.
MESSKO® oil level indicator from the MTO type series are measuring devices with or
without main switching contacts that are especially well-suited for measuring the fill
level in transformer oil conservators.
Design of MESSKO® MTO oil level indicator Float movement Float movement
The oil level indicator from MESSKO consists of a housing with
® in radial direction in axial direction
a display scale and a float. The float rod transmits the float‘s
stroke movement to a shaft connected to the pointer axis over
a magnetic coupling. There are two different drive types for the
float: radial and axial. The electrical connection is made out of
the connection terminals under a cover panel inside the housing
that has the connection diagram printed on it.
The inspection glass consists of laminated safety glass with

a UV filter, ensuring the legibility of the digitally printed dials
for years to come. The inspection glass is integrated into a metal
ring with a seal. The bayonet lock ensures secure closing and
protection for moving parts inside the housing.
distance distance
tube length tube length
Float drive types – radial or axial

The MESSKO® MTO oil level indicator can be ordered with two
different float movements relative to the oil conservator:
The design with float movement in a radial direction is ideal

for use in standard conservators (without an air cushion).
viewing glass electrical
terminals rubber bag
The design with float movement in the axial direction is ideal
for use in narrow or flat conservators where only small amounts
of float movement are possible, as well as in conservators with-
out an air pocket. The float movement can be expressed in a
ratio of 1:1, 1:2, 1:3 or 1:4.
Versions of micro-switches (change-over contacts)

MESSKO® MTO-ST160 (G)
The colored switching triangles on the dial face are adjustable
limit switches (3 micro-switches possible). These switching
triangles can be moved over the entire scale range. Color of
the switching triangles: MAX = blue, MIN = red
MESSKO® MTO-STF160 (G)

Permanently set limit switches (max. 3 change-over contacts)
are indicated by a line (switching mark) 5° before where
MAX/MIN is printed. They are fixed at the factory; subse-
quent adjustment is not possible.
MESSKO® MTO –
BENEFITS AT A GLANCE.
l Extreme durability and functional reliability
l No readjustment or recalibration necessary
at any point during the service life
l Radial or axial version with various floats
for adapting to different tank geometries
l Inspection glass made of laminated safety
glass with integrated UV filter
l Scratch-resistant dial faces made with
a colorfast digital printing process
l No switches or a max. of 3 fixed limit
switches freely adjustable over the scale range
l IEC or ANSI-compliant design
l RS-485 interface
l Individual scale adjustment
Optional:
l Installation with angle of inclination
(15°; 30°; 45°)
l Remote display option over optional
TT-30 signal converter
l Option for connecting an EI 100/160
remote display over TT30
l Offshore design
Individual display scales

Thanks to the state-of-the-art digital printing pro-
cess, additional designs are available on request in
addition to the standard display (min 20 °C).
Example configurations
MTO-STF/TT
Optional: Oil level indicator with
with integrated
remote display
signal converter In areas where space is limited (installation in a buil-
for measured value ding), for very large transformers, for displaying the
remote transmission oil level in a remote control room or for connecting
to a monitoring system, all variants of the oil level
indicator can be equipped with permanently set limit
switches with the option of an analog or digital out-
MTO-STF RM put signal.
with IEC or ANSI-
compliant design l Analog outputs: (optionally adjustable at the
factory) – 0 ... 1 mA; – 0 ... 20 mA; – 4 ... 20 mA;
l Digital RS485 output (optional)
l K1 micro-switch (specify switching point when
ordering)
Electronic displays such as the EI100/160 can be

used for visualizing the 4 ... 20 mA signal.
FEATURE MODULAR KIT FOR OIL LEVEL INDICATORS.
Matching
Switching signal accessories
at the transformer
Direct displays
1 1 Signal converter TT
2 Analog output
Signal converter
3 Digital output
RS485 standard
(optional)
2 3
4 Electronic
indicator EI100
5 Electronic
Control cabinet
Switch room /
indicator EI160
4 5
Control room
SCADA-System Additional
information:
MESSKO® MTO – OIL LEVEL INDICATOR
WITH OPTIONAL REMOTE DISPLAY.
MESSKO® MTO Technical data
Housing Sheet steel, galvanized, standard RAL 7033 color tone, other color tones on request, coated in acrylic resin
Flange Aluminum AlSi1MgMn
Viewing glass Laminated safety glass with UV filter
Cable gland Brass, nickel-plated (standard), A4 stainless steel (offshore)
Indicator scale Aluminum-coated, with UV wide format printing and protective paint
Labeling Black, indicator in red daylight luminous paint
Terminals min. 0.25 mm2 / max. 2.5 mm2
Float rod Aluminum; optional brass for L ≤ 350 mm
Float Rohacell 110, oil-resistant, temperature-resistant to 160 °C
Dial lettering „MIN“, „+20 °C“, „MAX“ (other lettering possible)
Operating temperature –40 °C ... +70 °C; limited temperature range with optional TT- box (see below)
Degree of protection IP55 (DIN EN 60529)
Ventilation Ventilation element in the gauge part for avoiding the build up of condensation water
Installation Indoors and outdoors, tropic-proof
Adjustable micro-switches: Up to 3 freely adjustable micro-switches
MTO-ST160 (G) Contact material: Silver alloy (AgNi10)
Switching capacity (separating power) AC in accordance with DIN EN 60947-5-1:
AC-12: 230 V / 5 A; AC-15: 230 V / 260 mA, 120 V / 500 mA, 24 V / 2 A
Switching capacity (separating power) DC in accordance with DIN EN 60947-5-1:
DC-12: 220 V / 200 mA, 110 V / 400 mA; DC-13: 220 V / 110 mA, 120 V / 210 mA, 24 V / 1.04 A
Permanently pre-set micro-switches: Up to 3 permanently pre-set switches
MTO-STF160 (G) Contact material: Silver alloy
AC: 250 V / 15 A / cosφ= 1; DC: 12 V / 5 A (non-inductive); DC: 250 V / 0.25 A (non-inductive)
MESSKO® MTO TT box (optional) Technical data

Housing Cast AISi
Dimensions 120 (L) x 80 (W) x 60 (H) mm
Color Standard RAL 7033 color tone, other color tones on request, coated in acrylic resin
Cable gland 2 x M20 x 1.5, nickel-plated brass, offshore variant: A4 stainless steel
Connection plug (optional) 9-pin
Installation Indoors and outdoors, tropic-proof
Operating temperature –25 °C ... +70 °C
Housing degree of protection IP55 (DIN EN 60529)
Supply voltage 24 V DC (+/– 15%)
Current draw About 80 mA
Status display Power ON (green LED), contact K1 (red LED)
Limit contact 1 x changeover switch
Contact load AC: 250 V / 5 A / cosφ = 1
DC: 250 V / 0.3 A (non-inductive)
Analog output signals 0 ... 1 mA, 0 ... 20 mA, 4 ... 20 mA (optional factory setting)
Digital output signal 1 x RS485 at terminals (optional)
Messko GmbH
Gewerbegebiet An den Drei Hasen
Messko-Platz 1
61440 Oberursel, Germany
Phone: +49 6171 6398 0

Fax: +49 6171 6398 98
E-mail: messko-info@reinhausen.com
www.reinhausen.com/messko
Bitte beachten:
Die in allen unseren Publikationen enthaltenen Angaben
können in Details von dem gelieferten Gerät abweichen.
Änderungen bleiben vorbehalten.
IN2069/03/01 EN – MESSKO® MTO –

MS99086102 – 02/18 – ©Messko GmbH 2018

Messko MTO Oil Level Indicator For Transformers

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MESSKO® MTO

OIL LEVEL INDICATOR

MESSKO® MTO – OIL LEVEL INDICATOR

The inspection glass consists of laminated safety glass with

Float drive types – radial or axial

The design with float movement in a radial direction is ideal

Versions of micro-switches (change-over contacts)

MESSKO® MTO-STF160 (G)

Individual display scales

Electronic displays such as the EI100/160 can be

MESSKO® MTO TT box (optional) Technical data

Phone: +49 6171 6398 0

IN2069/03/01 EN – MESSKO® MTO –

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