25
Fault indications and troubleshooting
Note
Please indicate the version and material numbers stated on the name plate when ordering
spare parts.
After replacing the electronic circuit board, please carry out commissioning once more.
Check the conductivity readings of controllers LRR 1-51, LRR 1-53 and of KS 90-1 by
carrying out comparison measurements.
If you encounter any deviations, please correct the cell constant of the conductivity trans-
mitter.
1. Unscrew the cover screws & and remove the housing cover /. The arrow on this cover points to the
name plate. Fig. 1, 9
2. Disconnect electrode wires from terminal lugs on circuit board.
3. Detach the terminal strip d.
4. Undo the functional earth f connection.
5. Unscrew the fixing screws e for the electronic circuit board and remove the board.
The circuit board is available as a spare part.
Order no. LRGT 16-1
LRGT 17-1
LRGT 16-2
321320 LRV 1-40
24 V DC
321370 LRV 1-42
24 V DC
6. Install the new electronic circuit board in reverse order to the above.
Replacing the electronic circuit board
In the event of faults that cannot be remedied with the aid of this manual, please contact our service
centre or authorised agent in your country.
1. Unscrew the cover screws & and remove the housing cover /. The arrow on this cover points to the
name plate. Fig. 1, 9
2. Disconnect electrode wires from terminal lugs 1-4 on the circuit board.
3. Connect terminal lugs 1+2 to 3+4.
4. Connect 1 kohm resistance to terminal lugs 2+3.
5. Approx. 1000 µS/cm must be indicated.
6. If this value is reached, remove the resistance and restore the original state. If it is not, replace the
electronic circuit board.
Checking the electronic circuit board
continued
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