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5
Maintenance
Maintenance primarily comprises changing any sensors that no longer meet their initial
metrological characteristics.
Since they are liable to affect detection reliability, the tasks described in this chapter
are reserved for authorized trained personnel only. Inspection and maintenance shall
be carried out in accordance with EN/IEC 60079-17 standards in force or with other
national standards.
5.1 Possible errors
The table below summarizes the various possible detector errors.
Observed default
current output is at 0 mA
0 mA < current output < 1mA
current output is at 0.83 mA
Zero setting not possible
Sensitivity adjustment not
possible
«SUP» display
5.2 Replacing sensor block
The sensor block or detection module encloses the sensitive element and the corresponding
electronics. A sensor block can only be associated with a defined detector; so an oxygen
detection module will not be installed in the place of a LEL detection module.
NPO60GB
Revision F.2
Possible cause
Connector cable
Check cable
Power supply
Check voltage at detector terminal
Electronic card
Change board
Sensor
Change sensor
Line resistance too high
Check cable
Check voltage at detector terminal
Power supply
Improper calibration gas
Check the content of the calibration gas
GD10P optics are duty
GD10P in fault
Sensor
Change sensor
Electronic card
Change board
Sensor
Change sensor
Electronic card
Change board
Over-Range condition
Valid with the magnet
Check the span
OLCT 60
FIXED POINTGAS MONITOR
USER MANUAL
Action
(page )
34
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23
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refer to the
GD10P manual
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