3.6 UPSTREAM AEROSOL MEASUREMENTS (DOP OR PAO)
Note: Do not perform the steps in this section until completing section 3.1, Initialization.
Note: If there is a concern that the zero baselines may have drifted, the operator may re-
zero the instrument at any time by positioning the selector valve to the clear position,
pressing the <0> button, and pressing <ENTER>.
WARNING: The unit should be placed on a flat, stable surface with the area to be
monitored within reach of the sample lines.
1. Insert the UPSTREAM sample line into the upstream aerosol / air mixture.
Note: The sample line should be as close to the upstream side of the filter as possible.
2. Turn the Selector Valve to the UPSTREAM position. This switches the sample airflow to
the UPSTREAM sampling port on the front panel. The % LEAKAGE display indicates
the upstream concentration as compared to the reference that was set in the initialization
section.
Note: Adjust aerosol for desired challenge aerosol concentration.
3.7 MEASURING % LEAKAGE - USER DEFINED REFERENCE (USER)
1. Insert the UPSTREAM sample line into the upstream aerosol/air mixture.
Note: The sample line should be as close to the upstream side of the filter as possible.
2. Turn the Selector Valve to the UPSTREAM position. This switches the sample airflow to
the UPSTREAM sampling port on the front panel. The % LEAKAGE display indicates
the upstream reading.
3. Press the <100> button and press <ENTER>. The unit will begin scanning for a 100%
reference value.
Note: If error E4 is given then 100% calibration failed. The most likely reason this would
happen is if there is not enough aerosol present to take an accurate reading. Press
<ENTER> to clear the error. The unit defaults back to the previous reference setting.
4. After the 100% reference value has been successfully captured, the <0> LED will blink,
indicating that the 0% reference must be calibrated.
5. Switch the selector valve to CLEAR and press the <ENTER> button. The unit will scan
for the 0% reference value.
Revision A
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