Model 106-L Ozone Monitor Manual Rev. E
22
Table I. Troubleshooting the Ozone Monitor for performance problems.
Problem/symptom
Likely cause
Corrective action
Instrument does not
turn on.
Power not connected
properly or circuit
breaker open.
Check external power
connection for reverse
polarity or a short and
wait a few minutes for
the thermal circuit
breaker to reset.
Instrument turns on
then powers off.
Burned out air pump.
Remove top cover and
unplug air pump. Turn
instrument on; if it
remains running, then
the air pump motor is
burned out and shorting.
Replace air pump.
Display is blank or
nonsense.
Bad connection of
display to circuit board.
Remove top cover and
reconnect display to
circuit board. Check
solder connections to
display. A new LCD may
be required.
Cell temperature reads
low by several 10’s of
degrees.
Absent or loose
connection of
temperature probe cable
to circuit board.
Remove top cover and
reattach connector to
circuit board.
Readings are noisy
with standard
deviations greater than
2.5 ppb.
Lamp output is weak,
below 0.6 V on Lamp
Test.
Flow path contaminated.
Remove top cover and
check lamp connection
to circuit board. Run
Lamp Test from menu. If
photodiode voltage is
less than 0.6 V, replace
lamp.
Clean flow path with
methanol according to
the Cleaning Procedure.
