Panasonic PT-DZ12000U Operating Instructions Manual page 130

H. Particle Separators
Cyclone separators use a method similar to impactors in
that the larger particles cannot follow the main air stream at
some velocities. The large particles then drop out the bottom
of the cyclone separator while the air stream with much
smaller particles go out the top of the cyclone separator.
Just as with multi-stage impactors, multi-stage cyclone
separators can be used to collect a range of particle sizes.
I. Affect of Sample Inlets on Collection
The design of the sample inlet is critical to the efficacy of
the collection system.
The use of non-conductive materials should be avoided for
the collection of aerosol particles due to electrostatic
collection of those particles on the sample inlet before they
get to the point of collection.
The use of non-reactive materials should always be used
regardless of whether sampling for gases or aerosols.
The length, inside diameter, and bends in the sample inlet
should be sized so as to minimize loss of any of the sample in
the sample inlet itself.
Calculations should be performed on transport velocities to
ensure that the collection of aerosols remains isokinetic
throughout the sampling system.
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