Casella CEL Environmental enclosure for Microdust - Manual (Page 10)

2.3 PUF Filter Adapter
For size-selective monitoring applications, it is necessary to load the appro-
priate foam filter(s) into the inlet adapter. If TSP (Total Suspended Particulate)
monitoring is required, then no foams should be fitted within the inlet
assembly.
The type of foam filter loaded into the adapter determines the size of
particulate matter being monitored by the Microdust pro and collected on the
filter. Although the PUF foam inserts have been designed as size-selective
filters to capture particles larger than a specified mean aerodynamic size, it is
also possible to weigh the PUF inserts before and after measurement to
establish both the total suspended particulate (TSP) value and the desired
size fraction.
2.3.1 Storage of PUF Filters
The PUF filters should be kept in a clean and preferably air-conditioned
environment. 2.3.2 Inserting / Removing PUF Filters
The PUF filters should be carefully inserted or removed from their respective
cassettes using clean tweezers and plastic gloves. Avoid subjecting the
filters to physical damage, creasing or folding.
Filters should be loaded into the relevant housing as shown in Figure 6.
The probe should be inserted into the Adaptor Block and correctly aligned so
that the locating spigot on the PUF Filter Holder locks it into the Probe
Measuring Chamber. When locked correctly into position, the complete
assembly is prevented from rotating or moving laterally on the probe.
2.4 Collection Filter Cassette
A Filter Cassette is provided to accommodate a 37 mm filter, (25 mm is
available on request). The desired filter type (typically of the GFA type) should
be conditioned and pre-weighed (if required) before being loaded into the
cassette. Always handle filters with care to prevent contamination or
physical damage. Never operate the system without an inlet filter being fitted
– the filter protects the pump from any ingress of dirt.
2.5 Powering Up And Using The System
Caution !
The Environmental Enclosure is completely airtight when closed. It is
necessary to unscrew and remove the pressure relief valve located
under the carrying handle before use.
Page 10 of 20 Page 11 of 20
Using the Enclosure Using the Enclosure
P118204
P118208
Respirable Filter Holder PM10 Filter Holder
PM2.5 Filter Holder 990009
P118206
Figure 6: Filter Housings
Pump Connection
Dia. 37 mm
Filter Holder
MICRODUST Probe
"O" Ring
Dia. 25 mm
Filter holder
(Optional)
"O" Ring
Locating Spigot
"O" Ring
PUF Filter holder
PM / Respirable
(Optional)
10
Dia. 37 mm to
Dia. 25 mm
Reducer
(Optional)
Adaptor
Alternativ
es
Alternativ
es
00046
Locating Spigot
PUF Filter Holder PM 2.5
PUF Filter Head Cap
Measuring Chamber
Figure 5: PUF filter installation
ENVIRONMENTAL ENCLOSURE
For MICRODUST pro - User Manual ENVIRONMENTAL ENCLOSURE
For MICRODUST pro - User Manual