CEL-712 Microdust Pro Real-time Dust Monitor
49 Casella Measurement
The basic design of the Gravimetric (TSP) and Size Selective Adapters (PUF)
are the same, but with different inlet fittings.
PUF Size Selective Adapter
The polyurethane foam filter (PUF filter) adapter is for use in PM
10
, respirable
and PM
2.5
sampling applications that have a flow rate of 3.5 litres/minute. The
design is based on the Conical Inhalable Sampler (CIS), which is identified in
the Health and Safety Executive’s publication MDHS14.
For monitoring applications, the adapter is fitted to the sampling probe as
shown in Figure 25.
The air sample is drawn through the PUF filter and then into the instrument
probe’s measuring chamber before being deposited onto the filter (37 mm).
The type of foam filter loaded into the adapter determines the size of particulate
matter being monitored by the instrument and being collected on the filter.
The PUF filter inserts have been designed as size-selective filters to capture
particles that are larger than a specified mean aerodynamic size. However, it is
also possible to pre-weigh and post-weigh the PUF inserts to determine the
total inhalable size dust fraction value and the desired size fraction.
PUF filters should be stored in a clean and, preferably, air-conditioned
environment.
If used without PUF filters, the adaptor will provide the total inhalable size dust
fraction if the pump is run at 3.5L/min.
To insert or remove PUF filters from their filter cassettes, use clean tweezers
and vinyl gloves. Do not allow the filters to become damaged, creased or folded
in any way.
Spare PUF filters are available from Casella:-
PM2.5 foams (packs of 10) Part Number P118204
PM10 foams (packs of 10) Part Number P118206
Respirable 2 foams (packs of 10) Part Number P118208
Probe contamination
When using any of the Gravimetric adapters we recommend that sampling is
performed with the probe orientated horizontally (This reduces the risk
particulate material falling onto the optical lens elements located at each end
of the probe). Excessive build-up of dust on lens components may result in a
large ‘Zero signal’ level and the disabling of lower ‘contaminated’ measurement
ranges.
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