Check List Mag Sensor - Siemens MAG 1100 Handbook

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SITRANS F M MAGFLO
9.3

Check list MAG sensor

76
9. Service
ATTENTION!
If there is leakage from MAG 1100/3100/3100 W or MAG 5100 W and the unit has been used
to measure inflammable/explosive liquids, there might be a risk of explosion when checking
with a megger.
Disconnect all leads to MAG 1100/3100/3100 W or MAG 5100 W
MAG 1100/3100/3100 W or MAG 5100 W installed and filled with the medium:
Check coil resistance with a multimeter
R 85-86
Check coil insulation with a megger (500 V)
R 85 - Gnd
Check electrode circuit with a moving-coil instru-
ment without amplifier (measurement unstable)
R 82 - Gnd
R 83 - Gnd
Sensor apparently OK.
Remove sensor, dry it and check
MAG 1100/3100/3100 W or MAG 5100 W removed from system – empty and dry:
Check coil resistance with a multimeter
R 85-86
Check coil insulation with a megger (500 V)
R 85 - Gnd
Check electrode insulation with megger (500 V)
R 82 - Gnd
R 83 - Gnd
Check continuity between electrode and electrode
terminal
R 82 - Electrode
R 83 - Electrode
MAG 1100/3100/3100 W or MAG 5100 W OK
DKFD.PS.027.W3.02
Nominal value: See table
YES
Nominal value: Infinite resistance
YES
Nominal value: 5-500 kohm
Nominal value: 5-500 kohm
< 500 kohm
Nominal value: See table
YES
Nominal value: Infinite resistance
YES
Nominal value: Infinite resistance
Nominal value: Infinite resistance
YES
Nominal value: 0 kohm
Nominal value: 0 kohm
YES
NO
NO
Sensor may be defective.
Contact Siemens Flow
Instruments
> 500 kohm
Dirty electrodes or
conductivity too low
NO
NO
NO
NO
Sensor may be defective.
Contact Siemens Flow
Instruments