201
7-0
2
36
Level Probe LGC2
Diagnostics and Troubleshooting
8
Diagnostics and Troubleshooting
8.1
Troubleshooting
General Errors
8.2
Troubleshooting Specific to Level Probe with optional Pt100
Resistance Thermometer
Error
Possible reason
Solution
Device is not
responding.
Supply voltage does not match the
specification on the nameplate.
Apply correct voltage.
Supply voltage has incorrect
polarity.
Reverse polarity of supply voltage.
Connecting cables are not in
contact with the terminals.
Check the connection of the cables
and correct if necessary.
Output current
< 3.6 mA
Signal line is not wired correctly.
Electronics unit is defective.
Check wiring.
Table 8.1
Error
Reason
Solution
No measuring
signal
4 to 20 mA cable not connected
correctly.
Connect device, see chapter 6.
No power supplied via the
4 to 20 mA cable.
Check current loop.
Supply voltage too low
(min. 10.5 V DC).
• Check supply voltage.
• Overall resistance greater than
max. load resistance.
Device defective.
Replace the device.
Temperature
measured value
is inaccurate/
incorrect (only
for level probe
with Pt100
resistance
thermometer).
Pt100 resistance thermometer
connected in 2-wire circuit, cable
resistance was not compensated
for.
• Compensate the cable
resistance.
• Connect Pt100 resistance
thermometer as 3-wire or
4-wire circuit.
Table 8.2
