Zero Count Test
248083408-1 Rev 1
B-1
B
Zero Count Test
How to Run
the Test
This is the Zero Count Test procedure. A Purge (Zero Count) Filter
must be attached to the instrument and 6 five-minute samples must be
taken. There should be no more than 1 count, average, per five-minute
sample. The purge filter should be a 0.1 micron filter at 0.1 CFM.
1.
Connect the instrument to the monitoring system.
2.
Attach the Purge Filter to the sample inlet.
3.
Apply power to the instrument.
4.
Allow the instrument to sample through a 30 minute period. This
time allows the unit to warm up and purge any residual particles
that might be inside it.
5.
Configure the unit to sample for 5 minutes.
6.
Allow the instrument to sample 6 five-minute periods.
7.
If the average count for the total of the six sample periods is NOT
less than one per five minute period or if more than one count
occurs in ANY five-minute sample period, allow the instrument
to sample for an additional 30 minutes to purge it and repeat the
test.
8.
If the instrument still fails the Zero Count Test, call Lighthouse
Technical Support for assistance.
After the instrument meets the requirements of the Zero Count test, turn
it off, remove the Purge Filter and return the instrument to its normal
location and operating status.
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