8.1
SECTION 8 FAULT DIAGNOSIS
8.1 Introduction
This section describes the faults which may be indicated for each type of gas sensor
module and the chassis as well as the diagnostic signals which may be accessed
through the user interface. See ’Review’ section 6 for directions on accessing fault and
diagnostic information. When requesting technical assistance from Servomex you
should advise the following:-
A list of which faults are present
A list of the corresponding diagnostic signal levels
The analyser serial number.
Guidance on locating and rectifying problems is given where appropriate. For
instructions on displaying the current fault status then see section 6.3. For instructions
on displaying the diagnostic signals then see section 6.11.
8.2 Fault diagnosis on the Pm1156 transducer
Table 8.1 shows a list of the indicated fault conditions for the 1156 paramagnetic
transducer.
Table 8.1 Fault diagnosis on the Pm1156 transducer
Fault indicated Possible causes Recommended
action
CELL VOLTS HIGH Faulty component Call service engineer
CELL VOLTS LOW Faulty component Call service engineer
CELL TEMP HIGH Ambient temperature
too high or faulty
component
Check ambient
operating temperature
is < 40°C or call
service engineer
SAMPLE FLOW LOW Sample flow recorded
by optional flow
monitor is too low.
Check sample inlet
pressure and flow rate.
Check for blocked
sample lines, filter or
vent pipes. If all OK
then call service
engineer.
CELL TEMP LOW Faulty component Call service engineer
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