WIKA Operating Instructions Level Transmitter
– BLM-SF-FM
31
7. Faults
Failure
Causes
Measures
No function
Power supply not connect-
ed.
Screw terminals loose.
Check power supply.
Tighten screw terminals.
Output does not
reach 4 mA or 20
mA
Offset and/or Span not
properly set.
Supply voltage insufficient.
Correct offset and span.
Check supply voltage.
Output does respond
to level changes.
Float not in measurement
range.
Density of medium too low.
Disturbing magnetic field in
range of sensor.
Current simulation or multi-
drop-mode is active.
Wrong magnet type select-
ed.
Wrong mounting direction
selected.
Sensor defective.
Check float stops.
Check float’s density.
Remove magnetized mate-
rials or magnets in the sen-
sor’s range.
Deactivate current simula-
tion or multidrop-mode.
Enter correct magnet type.
Enter correct mounting
direction.
Contact service.
Output < 4 mA or >
20 mA
Float out of measurement
range.
Set up range correctly and
check float stops.
Output < 3.8 mA or >
20.5 mA
Float defective.
Wrong magnet type select-
ed.
Wrong mounting direction
selected.
Transmitter electronics
defective.
Check float.
Enter correct magnet type.
Enter correct mounting
direction.
Contact service.
