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15
5.0 Troubleshooting
Series 200/205
Fault Description
Possible cause
Remedy
No power
Lead connection broken
Power supply failure
Battery flat
S200 damaged
Sensor head damaged
Reconnect power lead
Replace 12V DC power supply
Recharge battery
Replace unit
Replace sensor head
Sensor failure
when the sensor
is new
Insufficient warm up
Air contaminated
Sensor damaged
Run the sensor on full power for
24-48 hours.
If an ozone source is available,
exposure to 100 ppb for 5 min-
utes will speed up the decon-
tamination process
(approximately 30 minutes)
Move the sensor to cleaner
environment and check reading
Replace sensor
Reading high
under zero gas
conditions
Background gas level higher
than normal
Interferent gas present
Sensor damaged
Move sensor to clean air and
recheck baseline
Move sensor to clean air and
recheck baseline
Replace sensor
Reading lower
than expected
reading in the
presence of sen-
sor gas
Sensor correct
Sensor inlet contaminated
Sensor fan failed
Interferent gas present
Gas reactive and decompos-
ing before detection
Local air flow too high (ozone
sensors) or
too low (VOC and ammonia
sensors)
Sensor calibration lost
Check calibration of gas genera-
tor.
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