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5
5.1
5.1.1
5.1.2
5.1.3
INM MTL 130-0175 Rev 4
MAINTENANCE
The internals of the sensor unit operate at elevated temperatures. Take great care when
working on an analyser that has power applied or has only recently been turned off.
General
Electronics
The electronics unit is virtually maintenance free. Faults in modern electronics equipment
normally show up in the first six months of continuous operation. Tests show that following this
period, the life is virtually infinite, (10 years or more) assuming that the instrument has not been
subjected to use beyond its specification.
All the electronic modules require specialist test equipment and any adjustments, other than
those available on the front panel should be avoided.
Sensor Unit
Following commissioning it is advisable to check the calibration as described in section 4.3
after one week of continuous operation. Following this check, monthly checks should be
adequate. When carrying out the calibration check, it is useful to observe the response rate
of the SENSOR. With the air off or the sample valve shut the response to the calibration gas,
assuming the line is purged up to the inlet connector, should be virtually instantaneous. The
reading of sample oxygen should be fully stabilised in 5 to 10 seconds.
If it is suspected that the SENSOR is faulty a check on its electrical resistance is a good
indication of failure. See section 6.1
Catalytic Combustion Unit
Provided that no samples containing significant levels of sulphur, phosphorus, heavy metals,
silicon or halogen compounds, have been through the analyser, the catalyst should last
indefinitely. Running the system for long periods with fuel rich mixtures should also be avoided.
NOTE
9
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