41
Fault Description
Possible cause
Remedy
Reading lower than
expected reading in
the presence of
sensor gas
Sensor correct
Sensor inlet
contaminated
Sensor fan failed
Interferent gas present
Gas reactive and de-
composing before
detection
Local air flow too high
(ozone sensors) or
too low (VOC and
ammonia sensors)
Sensor calibration lost
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
concentration
Move the monitor closer to the
source of the gas
Modify the airflow into and around
sensor head.
Replace /refurbish sensor
Reading higher than
expected in the
presence of sensor
gas
Sensor correct
Interferent gas present
Sensor calibration lost
Check calibration of gas generator.
Move sensor to clean air and check
reading upon exposure to known gas
concentration
Replace /refurbish sensor
Reading unstable
Power supply unstable
Power supply current
rating incorrect
Local air flow too high
Environmental condi-
tions fluctuating
EMI noise picked up
via RS232 cable
(S500/505 unit only)
and PC
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.
RS232 communica-
tions unstable (S500
& 505 only)
Connections broken
COM Port settings
incorrect
Clock setting incorrect
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 Aeroqual for battery replacement.
Содержание Series 300
Страница 1: ...Series 300 305 500 505 Monitor User Guide ...