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Aeroqual AQM60 User Guide
7.4.2. Purge Flow Check
Initiate the purge cycle on AQM Software. The purge cycle is designed to pump air backwards through the
optical engine as a cleaning mechanism. It also acts as a zero air check and adjusts the zero automatically.
This will occur every 12 hours (720 minutes) automatically. To check the purge flow is operating correctly:
Select Diagnostics
Sensor Module Settings
Set the TIMA to 1.000 (1 minute)
Use a volumetric flow meter to record the flow using the same steps as measuring the sample flow.
Note 1: The adaptor tubing needs to be connected to the BOTTOM of the volumetric flow meter
(positive flow)
Note 2: The flow rate should be > 0.3 LPM
If the flow is less than 0.3 LPM then open the Purge Adjuster by turning the adjustment anti-clockwise until
0.3 LPM is reached.
Note 3: Remember to reset the TIMA to 720. It may take a few moments for the purge cycle to
complete. The unit can also be restarted to stop the purge cycle.
Note 4: It is important to re-measure the inlet sample flow rate following a purge flow adjustment. The
sample flow rate must be stable at 2.0 LPM.
7.4.3. Sheath Flow Check
The sheath flow is a constant stream of air which ensures
the optics remains clean. It is important this is working
correctly to maintain the accuracy of the measurement. In
order to check the flow, a volumetric flow meter needs to be
connected between the purge flow adjuster and particle
engine as seen in the diagram.
Note 1: The flow should be approximately 0.2 LPM
7.4.4. Leak Check
If the correct sample, purge or sheath flow cannot be achieved, there may be a leak in the pump module or
80180 engine. First check the entire flow system:
Remove the purge connection from the module and plug the end of the purge line
Remove the TSP head and block the PM inlet.
Connected the pressure end of a flow meter to the exhaust port of the module.
If there is no leak the flow should drop to zero.
Summary of Contents for AQM60
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