PARTICLE MASS COUNTER / EN
20
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 in
count mode.
4. Verify the data on the display:
On average, not more than one particle greater
than 0.5
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”.
