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Fault description
OGM does not deliver pulses
Indicator LED is not working
Delivered pulse number too low
Delivered pulse number fluctuating
No metering
Malfunctions and troubleshooting
Cause
Incorrect flow direction
Wired incorrectly
Polarity of PLC input not
compliant
Oval gears blocked by
obstructions
Oval gears blocked by
swelling of parts due to
chemical incompatibility
Required bridging in
connector missing (PIN 3-2)
Flow rate too low - no pulse
output
LED defective
Operation under lower start-
up limit
Flow rate too high
Incorrect pulse value
Air bubbles in metering
medium
OGM not sufficiently vented
Back-pressure too high
73
Remedy
Install OGM according to flow direction
indicated
Ä More information on: Flow meter - oval gear
PLUS
meter OGM
[ECOLAB]
Connection to PLC according to specification
Ä More information on: Flow meter - oval gear
meter OGM
PLUS
[ECOLAB]
Reprogram OGM (PNP < > NPN)
Ä More information on: Flow meter - oval gear
PLUS
meter OGM
[ECOLAB]
Clean oval gears, connect fine filter upstream if
necessary
Ä More information on: Flow meter - oval gear
PLUS
meter OGM
[ECOLAB]
Replace affected parts (complete OGM if
necessary) - check chemical compatibility
BEFORE use
Ä More information on: Flow meter - oval gear
meter OGM
PLUS
[ECOLAB]
Check whether the bridging device is present in
the connector (continuity test).
Ä More information on: Flow meter - oval gear
meter OGM
PLUS
[ECOLAB]
Increase flow
Use suitable OGM size
Ä More information on: Flow meter - oval gear
meter OGM
PLUS
[ECOLAB]
Replace OGM cover
Ä More information on: Flow meter - oval gear
PLUS
meter OGM
[ECOLAB]
Increase flow
Use suitable OGM size
Ä More information on: Flow meter - oval gear
PLUS
meter OGM
[ECOLAB]
Reduce flow rate
Use suitable OGM size
Ä More information on: Flow meter - oval gear
PLUS
meter OGM
[ECOLAB]
Determine pulse value and reprogram, if
necessary
Ä More information on: Flow meter - oval gear
PLUS
meter OGM
[ECOLAB]
Vent metering system
Ä More information on: Flow meter - oval gear
meter OGM
PLUS
[ECOLAB]
Check OGM for trapped air bubbles and vent
metering system completely
Ä More information on: Flow meter - oval gear
meter OGM
PLUS
[ECOLAB]
Reduce pressure
MAN053089 Rev. 1-11.2023
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