CEL-712 Microdust Pro Real-time Dust Monitor
46 Casella Measurement
7 Sampling accessories
When you use the Microdust Pro instrument in static monitoring applications,
you should use some form of aspiration with the sampling probe. This can be a
TUFF Air Sampling Pump.
By maintaining an air flow through the sampling probe you can eliminate
possible errors caused by the orientation of the probe’s inlet and size selectivity.
The gravimetric and respirable adapters include 37 mm filter cassettes, and
provide a convenient method of calibrating the instrument.
7.1 Sampling Adapters (PUF Size Selective and Gravimetric TSP)
The gravimetric adapter units draw particulate matter through the sampling
probe’s measuring chamber and deposit it on a 37 mm filter. There are two
gravimetric adapter options available:
Total Suspended Particulate (TSP)
When no size-selective sampling inlet is used, the instrument measures
all particulate that can be 'seen' by the optical detection system. This
might not represent all airborne material because very large and very
small particles cannot be seen.
Polyurethane Foam Filter (PUF)
Respirable, PM10 and PM2.5 measurements can be made using a PUF
size-selective inlet system.
These adapters allow you to use standard gravimetric methods to cross-check
readings from the instrument against a weighed sample.
All components of these adapters fit together using O-ring seals. You should
check the O-rings regularly and fit new O-rings if there are any signs of damage.
Damaged O-rings can cause measurement errors due to air leakage.
If errors exist between the instrument’s measurements and the true gravimetric
value, you can determine and apply a correction factor to the instrument’s
measurements. See Calibration for specific particulate types beginning on page
33 for instructions to do this.
Align and insert the sampling probe into the adapter block. Insert the adapter’s
locating spigot into the probe’s inlet so that the adapter cannot rotate or move
on the probe.
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