H. Maintaining and Troubleshooting the AQSync
Model AQSync Air Quality Monitoring Station Manual Rev. A-1
42
H.
Maintenance and Troubleshooting
H.1
Maintenance
The AQSync has been designed to produce reliable data with minimal intervention. The
recommendations below reflect procedures to meet the highest data quality objectives.
H.1.1
Replacement of CO
2
Scrubber
The CO
2
scrubber uses soda lime as the scrubbing material. The replacement
frequency depends on the auto-zeroing frequency as well as the CO
2
concentration and
the flow rate of the sample air. At the recommended zeroing frequency of 6 hours and
duration of 40 seconds, and ambient CO
2
concentrations of ~400 ppm, replacement is
recommended ~every 6 months. If ambient CO
2
levels start to consistently go below
400 ppm, replacement of the soda lime is indicated.
No tools are needed to access the CO
2
scrubber housing and replace the CO
2
scrubber:
1. Disconnect the inlet and outlet lines from the white barb fittings, shown by the
red arrows. Make note of which line was to the front and which to the back.
Unscrew the mounting thumbscrew shown by the red circle.
2. The back of the housing has screw and washer mounting assemblies that slide
into the slotted holes in the AQSync bracket shown in picture #2.
3. Slide the housing toward the front of the AQSync so that the mounting
assemblies can be removed from the bracket. The electrical connection on the
back of the housing does not need to be removed.
1
2
3
