H. Maintaining and Troubleshooting the AQSync
Model AQSync Air Quality Monitoring Station Manual Rev. A-1
47
H.2
Troubleshooting
H.2.1
Overall System Checks
•
Power is being supplied correctly (check power connections)
•
Weather station is plugged in securely
•
All lights on the Relay Board are “green”.
•
If touchscreen won’t go through startup routine, contact 2B Tech.
The Parameters screens for the individual instruments give information that is useful for
diagnosing and troubleshooting. Refer to the Parameters screens, in conjunction with
the instrument manufacturer information in Appendix 1 and the information below.
H.2.2
Ozone Module Troubleshooting
The following are indications of various instrument malfunctions for the Ozone module
in the AQSync.
Air Pump Failure:
T
he ozone instrument’s flow is drawn
by a pump via the connector labeled P1 in the AQSync
(front panel near the touchscreen). The ozone cell
pressure is a useful diagnostic of pump failure. Normally,
the ozone pressure reading will be below ambient by ~10
mbar or more. However if the pump is failing, the pressure
will be about the same as ambient. Therefore, compare
the ozone cell pressure readout (Ozone Parameters screen) to the readout of ambient
pressure given by the weather transmitter (access from the Home screen).
Lamp Failure:
The ozone measurements will be erratic
and the photodiode voltage (Ozone Parameters screen,
see figure at right) will be less than 0.6 V.
Solenoid Valve Failure:
The ozone readings will be low
and average to close to zero if the solenoid valve is not switching. Partial switching of
the solenoid valve will cause the instrument to read low but not zero.
Contaminated Flow Path:
The instrument will typically have a large positive or
negative offset and the ozone readings will be low once corrected for the measured
offset.
Contaminated Ozone Scrubber:
Large calibration parameters (offset and/or slope)
indicates that replacement of the ozone measurement scrubber may be needed.
Note: If a VOC sensor is included in your AQSync, its reading also appears on this
screen.
