5
Run Times
Apex Standard > 20 hours, Apex I.S > 12 hours, Apex Lite > 24hours (@ 3.5L/min via GFA
filters). Microdust
Pro
with NiMH batteries typically 19 hours. Alkaline cells > 13 hours. (All run
times may be reduced at low temperatures).
Using the Dust Detective SAS Unit
Installation
Cutouts are provided in the foam for the Microdust
Pro
and Apex sampling units. Ensure both
units are fully charged up or have new AA cells if required before insertion.
Note: Ensure the Apex and Microdust pro are held firmly by the Velcro straps provided,
otherwise damage to the instruments could occur.
Connect the Apex pump to the sampling spigot (X).
Connect the Microdust probe into the Adaptor Block and correctly align such that the locating
spigot on the PUF Filter Holder locks into the Probe Measuring Chamber. When locked correctly
into position, the complete assembly is prevented from rotating or moving laterally on the probe.
(see figure 4). The body of the probe will be located into the retaining clip.
PUF Filter Adaptor
For size-selective monitoring applications, it is necessary to load the appropriate 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.
Storage of PUF Filters
The PUF filters should be kept in a clean and preferably air-conditioned environment.
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 3,4.
Collection Filter Cassette
A Filter Cassette is provided to accommodate a 37 or 25mm filter. 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.
