MRK-D-0048 V4
Aeroqual Dust Sentry / AQS User Guide
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6.2 Flow meters and flow measurement
Accurate and precise flow rate measurement is critical for monitor service and calibration. Flow rates
can be measured and reported in a number of different ways. It is important to understand the
terminology and equipment associated with flow rate measurement.
Flow meters for gas flow measurement
For gas flow measurements, Aeroqual recommends either the Bios Defender DryCal or the TSI 4040
(AQM R7) flow meter. These can both be used to measure gas flow and Particle Monitor flow.
Figure 6-2 A high quality flow meter is required for gas flow measurement of the AQS monitor.
Flow meter for PM flow measurements
For PM flow rate measurements a 0.2 - 2.5 L/min rotameter is suitable, or the flow meters noted
above. A rotameter is included in the Dust Sentry service kit (DS R20), but not the AQS service kit
(AQS R20). It is also available separately (DS R8).
Figure 6-3 0.2 - 2.5 L/min rotameter for PM flow measurements.
6.3 Manual Service Mode
Performing service work on the monitor such as changing filters or measuring flow rates can cause
the gas or particle readings to fluctuate. It is important to exclude these data from air quality reports.
The monitor
can be put in to “Manual Service Mode” by pushing the start button in the Calibration and
Service app. This will cause the data to be labelled as “service”, normally the data is labelled as
‘sample”. This is illustrated in Figure 6-4 and allows a data analyst to easily filter out service data
when performing quality control, calculating hourly or daily averages or writing air quality reports.
Figure 6-4 The monitor can be put into Service Mode by clicking the button in the Calibration and Service
app. This will label the data as "Service" in the inlet column so the data can be filtered.