Kanomax Gasmaster 2750 User Manual page 31

Fault Description
No power
Sensor failure when
the sensor is new
Reading high under
zero gas conditions
Reading higher than
expected in the presence of
sensor gas
Reading lower than expected
reading in the presence of
sensor gas
Kanomax Gasmaster User Guide
MRK-D-0002 V3
Possible cause
Lead connection broken
Power supply failure
Battery flat
Unit damaged
Sensor head damaged
Insufficient warm up
Air contaminated
Sensor damaged
Background gas level higher
than normal
Interfering gas present
Sensor zero drift
Sensor damaged
Sensor correct
Interfering gas present
Sensor calibration lost
Sensor correct
Sensor inlet contaminated
Sensor fan failed
Interfering gas present
Remedy
Reconnect power lead
Replace 12V DC power supply
Recharge battery
Replace unit
Replace sensor head
Run the sensor on full power for 24-48
hours. If using an ozone sensor head
and an O3 source is available, exposure
to 100 ppb for 5 minutes will speed up
the decontamination process
(approximately 30 minutes)
Move the sensor to cleaner environment
and check reading
Replace sensor
Move sensor to clean air and
check reading is zero or close to zero
Move sensor to clean air and
check reading is zero or close to zero
ZERO CAL sensor zero grade air using
R42
Replace sensor
Check calibration of gas generator.
Move sensor to clean air and check
reading upon exposure to known gas
concentration
Replace /refurbish sensor
Check calibration of gas generator
Clean sensor inlet filter and mesh
Replace sensor
Move sensor to clean air and check
reading upon exposure to known gas
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