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PARTICLE COUNTER / EN
16
09/15/17 Version No. 00
7-2-1 Purging the Particle Counter:
Before taking particle samples, the meter should be purged using the zero
count filter.
Purging the meter will make sure the readings are accurate.
To purge the meter:
1. Fit the filter adapter onto the end of the zero
count filter. Note the arrow on the filter
denoting airflow direction.
2. Connect the adapter directly onto the end of
the isokinetic probe.
3. Operate the unit for approximately 5 minutes.
4. Verify the data on the display:
On the average, not more than one particle
greater than 0.3
µ
m in five minutes or not
more than one particle per 0.5 cubic foot
should be apparent.
Once the unit has been purged, resume
normal use. Remove the zero count filter
from the isokinetic probe.
In a clean-room application, the zero count filter
verifies that the meter is not false counting due
to sensor leakage, internal or external
interference or any other reason. In other
applications, the zero count filter purges the
sensor immediately after a high-concentration
sampling. If the unit fails, see “Purging the
Meter Sensor”.
7-2-2 Collect samples:
Important Caution: Remove the isokinetic probe cap so that the
isokinetic probe is not obstructed. Not doing
so can damage the meter.