H. Maintaining and Troubleshooting the AQSync
Model AQSync Air Quality Monitoring Station Manual Rev. A-1
48
Help with troubleshooting the ozone module is provided in the following table.
Table H.2. Troubleshooting the Ozone Module for performance problems.
Problem/Symptom
Likely Cause
Corrective Action
Readings are noisy with
standard deviations greater
than 2.5 ppb.
Lamp output is weak,
below 0.6 V on the
Ozone Parameters
screen
Flow path
contaminated.
Power off, open AQSync to check
lamp connection to circuit board.
Lamp may need replacement. If so,
return ozone module to 2B Tech for
exchange.
Contact 2B Tech.
Required calibration
parameters are large (>
9
ppb offset and/or >
9%
slope) when calibrated
using a standard ozone
source or reliable ozone
instrument.
Ozone measurement
scrubber is
contaminated.
Flow path is
contaminated.
Solenoid valve is
contaminated and not
opening and closing
properly.
Air pump for CO
2
+O
3
+CO is not drawing
sufficient flow (ozone
cell pressure is not
~10-20 mbar lower
than ambient pressure)
.
Replace the ozone inlet filter, and
return the ozone module to 2B Tech
for exchange.
Contact 2B Tech.
Power off, open AQSync and
unplug pumps P1 and P2. Turn
instrument on and listen for clicking
of solenoid valve every 2 seconds.
If solenoid valve is not clicking,
return the ozone module to 2B Tech
for exchange.
Check for leaks in the sampling
plumbing. If none found, the pump
may be failing. Return CO
2
module
to 2B Tech for exchange.
Ozone readings are
unexpectedly low or zero
Lamp voltage has
fallen below 0.6 V
(Ozone Parameters
screen).
Power off, open AQSync and check
lamp connection to circuit board. If
photodiode voltage is noisy and is
less than 0.6 V, the lamp needs to be
replaced. Return ozone module to
2B Tech for exchange.
