Flowserve LRG 16-40 - Manual (Page 27)

7
Malfunctions
– continued –
Fault finding list for troubleshooting
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Green LED 1 and red LED 2 are not illuminated
Fault: The electrode and the control unit cannot communicate.
Remedy: Check 4 V bus supply, wiring, node ID, baud rate and terminating resistors.
If modifications have to be made, switch off the mains voltage and switch it on again after
about. 5 sec.
Cleaning measuring electrode
The equipment must only be installed and removed by qualified and competent staff.
Take chapter “Installation” into account.
Before cleaning the measuring electrode, decommission and remove the conductivity electrode.
Then undo the safety grub screw and unscrew manually the measuring tube.
Cleaning electrode rod and measuring surface:
n
Wipe off non-adhesive deposits with a grease-free cloth.
n
To remove adhesive deposits use emery cloth (medium grain).
Replacing electronic circuit board
. Undo cover screws H and remove terminal cover I.
. Pull the electrode wires out of the terminal lugs O on the circuit board.
Remove terminal strip J.
3. Undo earth connection L.
4. Unscrew the fixing screws K of the electronic circuit board and take out the circuit board. The
circuit board is available as spare part type LRV -4.
5. Install the new electronic circuit board in reverse order.
Note
When ordering spare parts please state the serial number indicated on the name plate.
After replacing the electronic circuit board carry out reference measurements in order
to check the conductivity readings indicated by the operating device URB or
SPECTORcontrol.
If deviations occur correct the cell constant of the electrode. Observe the installation
instructions of URB or SPECTORcontrol.