MRK-D-0048 V4
Aeroqual Dust Sentry / AQS User Guide
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12.2 Particulate Matter module design
The Dust Sentry can measure a range of pre-defined particulate matter (PM) such as TSP, PM
10
, PM
2.5
or
PM
1.
The sample flow for the particle measurements is separate from the gas sample flow. There is a
separate pump, a separate inlet and a separate exhaust.
The Dust Sentry can measure particulate matter such as PM10 and PM2.5. There are
three
separate
modules:
1. for measuring the particulate (optical engine), there are two options to choose from:
2. Particle Monitor uses a
nephelometer
combined with a sharp cut cyclone (See Figure 12-4) and
measures a single size fraction such as TSP or PM
10
or PM
2.5
or PM
1
.
3. Particle Profiler uses an optical particle counter (See Figure 12-6) and measures four size fractions
simultaneously, TSP and PM
10
.and PM
2.5
and PM
1
.
4. for handling the data transfer (I/O module)
5. for controlling the flow rate (pump module)
The sample flow for the Particle Monitor and Particle Profiler is separate from the gas sample flow. There is a
separate pump, a separate inlet and a separate exhaust.
Comparison between the Particle Monitor and the Particle Profiler
The Particle Profiler measures particulate concentrations using particle counting, it outputs multiple
size fractions at the same time.
The Particle Profiler can measure TSP and PM
10
and PM
2.5
and PM
1
without requiring a sharp cut
cyclone.
The Particle Monitor measures particulate concentrations by nephelometry; it measures TSP or PM
10
or PM
2.5
or PM
1
using a sharp cut cyclone.
Particle Monitor
Particle Profiler
Mass outputs
TSP
or
PM10
or
PM2.5
or
PM1.0
TSP and PM10 and PM2.5 and
PM1.0
Particle count outputs
No
Yes
Accuracy
<±(2 μg/m
3
+ 5% of reading)
<±(5 μg/m
3
+ 15% of reading)
Factory calibration period
Every two years (24 months)
Every year (12 months)
Inlet flow rate
2.0 LPM
1.0 LPM
Table 12-2 Summary of the difference between the Particle Monitor and the Particle Profiler.