MRK-D-0048 V4
Aeroqual Dust Sentry / AQS User Guide
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Figure 6-19 When measuring the sample flow of the Particle Monitor a vacuum is measured. When
measuring the zero flow a positive pressure is measured.
The auto zero can be executed manually by temporarily changing one of the module settings. Once
the auto zero cycle is complete the setting needs to be returned back to the original setting.
Go to the Diagnostic and Advanced app in Connect software.
Select Module settings from the list on the left column
Locate the Particle Monitor settings, these will be either PM10.0 or PM2.5
Locate the TIMA parameter (it should be 720).
Change this value to 1 by clicking in the cell and typing 1, then save the setting change.
This will cause the auto zero to start. The flow will change from 2.000 LPM negative flow into the inlet
to approximately 0.2 to 0.6 positive flow out from the inlet.
You will need to change the port on the flow meter to measure this flow as shown in Figure 6-18.
If no flow is measured there may be an issue with the zero cycle or zero pump. See
Appendix 1 for trouble shooting.
Measure the positive flow coming out from the inlet and record this in the journal.
The zero cycle takes approximately 6 minutes to complete.
NOTE: Once the flow has been measured the TIMA parameter must be set back to 720.
Clean the Particle Monitor TSP inlet, particle trap and cyclone.
The Particle Monitor cyclone uses a small particle trap to remove larger particles. The trap needs to
be emptied and cleaned for optimum operation of the Particle Monitor. If the particle trap overfills then
the entire cyclone needs to be cleaned.
Tools required
Can of compressed air, cloth
Parts required
None
Service interval
Recommended 6
Monthly
. (See Section 6.1)
Online reference
training.aeroqual.com: Dust Sentry technical Training Section 5.1
Online video
YouTube Channel: Aeroqual Service and Maintenance playlist