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Fault Description
Reading higher than
expected in the pres-
ence of sensor gas
Reading unstable
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Possible cause
Sensor correct
Interferent gas pre-
sent
Sensor calibration lost
Power supply unsta-
ble
Power supply current
rating incorrect
Local air flow too high
Environmental condi-
tions fluctua ing
Remedy
Check calibration of gas
generator.
Move sensor to clean air
and check reading upon
exposure to known gas
concentration
Replace /refurbish sensor
Install stable power supply
Install power supply with
correct rating
Reduce air flow
Reduce fluctuations
16
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