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5.0 Dimensions
6.0 Troubleshooting
Fault description
Possible cause
Remedy
No power
Lead connection broken
Power supply failure
Damaged base electronics
Reconnect power lead
Replace 12V power supply
Replace base
Sensor failure when
new sensor
Insufficient warm up
Air contaminated
Sensor not plugged in
Sensor damaged
Run the sensor for 24-48 hours
Move the sensor to a cleaner
environment and check reading
Plug in the sensor properly
Replace sensor
Sensor showing high
reading under zero gas
conditions
Background gas level higher
than normal
Interferent gas present
Sensor zero drift
Sensor damaged
Move sensor to clean air to recheck
Move sensor to clean air to recheck
Re-zero sensor in a clean stable
background
Replace sensor
Sensor showing higher
than expected reading
in the presence of
sensor gas
Zero calibration incorrect
Span calibration incorrect
Sensor correct
Interferent gas present
Sensor Calibration lost
Zero calibrate sensor
Span calibrate sensor
Check calibration of gas generator
Move sensor to clean air and check
reading upon exposure to known gas
concentration
Replace / refurbish sensor
Sensor output noisy
Power supply noise
Local air flow too high
Environmental conditions
fluctuating
Install regulated power supply
Reduce air flow
Reduce fluctuations
Sensor showing lower
than expected reading
in the presence of
sensor gas
Zero calibration incorrect
Span calibration incorrect
Sensor correct
Sensor inlet contaminated
Interferent gas present
Gas reactive and
decomposing before detection
Sensor calibration lost
Zero calibrate sensor
Span calibrate sensor
Check calibration of gas generator
Clean sensor inlet filter and mesh
Move sensor to clean air and check
reading upon exposure to known gas
concentration
Move the monitor closer to the source
of the gas
Replace / refurbish the sensor
Red LED (0.5sec flash)
Sensor failure
Sensor not connected properly
Replace sensor
Remove and re-insert sensor correctly
Orange LED (2sec flash)
Dipswitch set incorrectly
Check dipswitch settings and adjust
110
m
m
H
ei
ght
=
90 m
m
180 mm
230 mm - inlet to outlet nozzles
10
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