TSI Instruments N95-Companion 8095, Operation And Service Manual

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Chapter 4 22
Performing the Classifier Check
After you perform the particle check with the P
ORTA
C
OUNT
Plus
still in the count mode, press and hold the classifier check button on
the back of the N95-Companion for a minimum of 15 seconds. This
disables power to the particle classifier. The P
ORTA
C
OUNT
Plus
display should gradually return to a count of 0.0. This verifies that
there are no leaks in the instrument and that the classifier is
functioning properly.
Note: Do not be concerned with an occasional 0.6 particle/cc
reading. However, if the display reads 1.2 particles/cc or
higher, you may need to return the N95-Companion
to TSI
for servicing or repair. Refer to Chapter 5,
“Troubleshooting,” for help in diagnosing the problem
before you return the instrument to TSI.
Performing the Zero Check
Put the P
ORTA
C
OUNT
in count mode. You should see a reading
greater than 70 particles/cc. Attach the small HEPA filter provided
with the P
ORTA
C
OUNT
to the clear sample hose coming out of the
sampling pendant. The particle count should drop to zero within 30
seconds to pass this test. An occasional reading of 0.6 is acceptable,
but the display should read 0.0 most of the time.
If a zero reading cannot be achieved, make sure all tubing is
properly attached. Check for leaks where the tubing connects to a
barb. Try a different filter or put two filters in-line if nothing else
works.
Classifier
Check Button