24
Attention
Before carrying out the fault diagnosis please check:
Supply voltage:
Is the level electrode supplied with the voltage specified on the name plate?
Wiring:
Is the wiring in accordance with the wiring diagram?
Troubleshooting
Indication, diagnosis and remedy
Indication of malfunctions
Equipment does not work accurately
Error
Remedy
The level electrode was installed without a protection
tube. The protection tube is required because it serves
as reference electrode.
Install a protection tube.
The vent hole in the protection tube does not exist, is
obstructed or flooded.
Check protection tube and, if necessary, provide vent hole.
The isolating valves of the external level pot (optional)
are closed.
Open isolating valve.
The desired lower measuring point is outside the
measuring range of the level transmitter. The level
electrode is too short.
Install a sufficiently long level electrode.
The adjustment of the measuring range is wrong.
Check measuring range setting on control unit NRS 2-40,
NRR 2-40.
The electrode rod is covered with dirt deposits.
Remove level electrode and clean the electrode tip with a
wet cloth.
Control units NRS 2-40, NRR 2-40 signal high or low
level alarm although the liquid level is within the
measuring range. Level electrode defective.
Replace level electrode.
The level electrode responds too sluggishly to chang-
es in the liquid level.
Correct attenuation.
