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Fault
Reason
Does not switch
No power
Faulty signal line
Faulty electronic insert
Strong build-up
WA (FEW54): contacts welded
together (after short-circuit)
Conductivity of liquid too low
Switches
Min-/Max-fail-safe mode set
incorrectly
wrongly
Faulty switching
Thick heavy foam,
sporadic
very turbulent conditions,
foaming liquid
Extreme radio interference
Water in housing
E5 (FEW52): output
overloaded
Remedy
Check power
Check signal line
Exchange
Select suitable measuring
range setting
(see page 26 ... 28)
Exchange WA (FEW54);
put fuse in contact circuit
Select different measuring
principle
Set correct mode at electronic
insert
Mount device in a bypass
if necessary
Screen connecting cable
Clean cover and cable gland
and screw tight
Reduce load,
(cable) capacitance
Trouble-shooting
35
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