Setting Up
15
Inlet Cap
When using the DustTrak monitor to sample environmental air, the inlet cap
should be put over the instrument. This cap will keep large objects from
dropping into and plugging the inlet. The cap will also keep direct light from
shinning into the chamber and skewing the results.
The inlet cap can simply be pressed onto the instruments inlet.
Figure 2-6: Putting on Inlet Cap
Size-Selective Impactors
Size-selective impactors can be attached to the inlet of the DustTrak II
instruments. Size-selective impactors can be used to pre-condition the size
range of the particles entering the instrument. PM
1
, PM
2.5
, PM
4
(Respirable)
and PM
10
impactors are available.
The instrument must run at the
factory default setting of 3.0 L/min for the impactors to achieve the
correct cut points.
The size-selective impactor is
composed of three parts; the cap,
impaction plate and bottom. Selection
of the cap will determine cut size of
the impactor. Each cap is labeled with
the particle cut size (1 µm, 2.5 µm,
4.0 µm or 10 µm). The same
impaction plate and bottom are used
on all impactor sizes.
The impactor assembly is attached to
the instrument in place of the inlet cap.
The inlet cap does not need to be used
if an impactor is being used. See
instructions on how to add oil to the
impaction plate.
Figure 2-7:
Size-Selective Impactor
Impaction Plate
Cap (1 µm,
2.5 µm, 4 µm
or 10 µm)
Bottom
