Sensor Failure - Kanomax Gasmaster 2750 User Manual

Reading unstable
External alarm and control
doesn't work correctly (Model
2750 units only)
USB communications unstable
(MODEL 2750 only)
8.1.

Sensor Failure

The handheld monitors have inbuilt diagnostics to detect sensor faults. If the sensor fails it can be
Kanomax Gasmaster User Guide
MRK-D-0002 V3
Gas reactive and de-composing
before detection
Local air flow too high (ozone
sensors) or too low (VOC and
ammonia sensors)
Sensor calibration lost
Power supply unstable
Power supply current rating
incorrect
Local air flow too high
Environmental conditions
fluctuating
EMI noise picked up via USB
cable and PC (MODEL 2750
unit only)
Incorrect RJ12 pins used
No diode across external relay
coil
Diode polarity incorrect
Connections broken
COM Port settings incorrect
Clock setting incorrect
concentration
Move the monitor closer to them source
of the gas
Modify the airflow into and around
sensor head.
Replace /refurbish sensor
Install stable power supply
Install power supply with correct
rating
Reduce air flow
Reduce fluctuations
Unplug cable to determine if this
reduces the instability. If this solves the
problem then isolate the power on PC
Check pins and wire correctly
Fit diode across external relay coil
Fit diode correctly
Reconnect leads
Setup COM port correctly
Synchronise clock with PC. If this does
not work then the Monitor clock battery
may be flat. Return monitor to Kanomax
for battery replacement.
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