Maintenance
Issue 5 - June 2005 Page 48 of 64 Pages
Maintenance
Check the unit for operation regularly. Service the controller every 12 months.
The transmitter or measuring head may require periodic recalibration. For further
information, please refer to the operating manual for the transmitter or measuring head.
If batteries are fitted to the control unit then these batteries should be maintained in
accordance with the instructions of the battery manufacturer.
Observe EN 50073 and respective national regulations.
Fault finding
Fault Remedy
1 Control unit non operational Check input fuse (F6). Replace if necessary.
Check third party electrical supply.
2 Display blank Check cable connection between main circuit
board and display board.
Adjust contrast potentiometer on display
board.
3 Self test routine fails Replace display board
4 Under-range displayed Check transmitter connections.
Check and measure loop current.
4-20 units:
Ensure connections fitted to positions A, B, C,
D and E of SK2 on main circuit board.
5 24 VDC voltage output too
low
Current must be < 100 mA.
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