85 • Calibrating Using the Single Calibration Method GX-6000 Operator’s Manual
3 . If you suspect any low-level VOC background in the area, you will need
to use the VOC zero filter.
NOTE: If you have both a VOC and a CO
2
sensor installed, you will need to
follow the directions in “Performing a Demand Zero for Instruments
with a Carbon Dioxide Sensor and a PID Sensor” on page 198
instead of following the directions shown below.
a. Remove the plug from each end of the VOC zero filter.
b. Attach the VOC zero filter to the inlet fitting or probe. The filter does
not have a preferred flow direction.
c. Let the instrument draw through the VOC zero filter for 1 minute
before continuing.
4 . To continue with the fresh air adjustment, press and hold the ▲AIR
button.
If you do not want to continue, press and release the DISP/LOCK button
and the unit will return to the Calibration Mode Screen.
5 . The GX-6000 will indicate that it is adjusting the zero reading for a few
seconds and then it will prompt you to release the ▲AIR button.
AIR
AIR CAL
HOLD AIR KEY
AIR
AIR CAL
HOLD AIR KEY
ADJUSTING ZERO
AIR
AIR CAL
RELEASE AIR KEY
ZERO ADJUSTED
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