Oldham olct 80, User Manual

Page: 85 / 120

9
– Maintenance
79
Chapter 9 | Maintenance
Maintenance mainly involves replacing any sensors that no longer meet their
original metrological specifications.
The operations explained in this section must be performed by
authorized, qualified personnel because they could affect detection
reliability. Inspection and maintenance must be carried out in
accordance with the current editions of EN60079-17 and eventually
with any local or national additional requirements that may apply in
the country of installation.
Possible transmitter errors
The table below lists various potential detector errors.
Fault observed Possible cause Action Page
0 mA line current Connection cable Check the cable. -
Power supply Check the voltage at the
transmitter's terminals (see
Alim V under the
Maintenance menu).
42
Electronic board Replace the board. -
Line current
> 0 mA and < 1mA
Sensor Replace the sensor (see
Sensor Replacement menu).
47 and 80
Line resistance too high Check the cable.
Power supply Check the voltage at the
transmitter's terminals (see
Alim V under the
Maintenance menu).
42
Improper calibration gas Check the concentration of
the calibration gas -
Check the input value (see
Calibration gas under Sensor
Replacement menu)
45
Zeroing not
possible Sensor Replace the sensor (see
Sensor Replacement menu).
47 and 80
Sensitivity
adjustment
impossible Sensor Replace the sensor (see
Sensor Replacement menu).
47 and 80
" SUP " displayed Verification required Acknowledge verification. 71