TSI Instruments DustTrak 8520, Operation And Service Manual

Page: 29 / 89

Operation 19
Figure 3–2: Connecting the Cyclone
1. D
UST
T
RAK
Sample Inlet 3. Cyclone Holder
2. Cyclone
Using the 1.0 or 2.5 µm Inlet Conditioners
The two blue inlet nozzles appear similar to the standard black inlet nozzle
but are engraved with their respective cut size. The blue nozzles should
always be used with the blue impactor plate. The black nozzle has a cut size
of 10
µ
m and should never be used with the impactor plate.
Install either the 1.0 or 2.5
µ
m inlet conditioner as follows.
1. Turn the D
UST
T
RAK
monitor off.
2. Remove the black inlet nozzle.
3. Evenly coat the center plateau of the blue impactor plate with a thin
layer of the supplied grease (Figure 3–3). Avoid getting the grease on
other parts of the impactor plate. If you do, simply wipe off the extra.
Notes: Do not use grease other than that supplied with this kit. This grease
has been chosen for its low outgassing and good wicking properties
to hold a large mass of particles.
The grease on the impactor plate increases the amount of time that
you can sample before particle bounce begins to affect the impactor
performance. Particle bounce results from particles not sticking to
the impactor plate and falling back into the aerosol stream.
4. Insert the blue impactor plate into the D
UST
T
RAK
monitor.
5. Select the blue nozzle with the cut size you want and make sure there is
an O-ring inside.
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