GX-6000 Operator’s Manual
Appendix G: Infrared Sensors • 203
5 . Reattach the tubing to the open end of the scrubber.
Performing a Demand Zero for Instruments with a
Carbon Dioxide Sensor and a PID Sensor
If your instrument has both an IR CO
2
sensor and a PID sensor, you will need to use both
the carbon dioxide scrubber and the VOC zero filter to perform a demand zero.
1 . Remove the CO
2
scrubber’s tubing from the side that has an arrow pointing to it.
2 . Remove both plugs from the tubing stubs on the VOC zero filter.
3 . Connect the VOC zero filter to the GX-6000’s inlet fitting. The filter does not have a
preferred flow direction.
4 . Connect the CO
2
scrubber to the tubing stub on the other side of the VOC zero filter.
Be sure the arrow on the CO
2
scrubber is pointing toward the VOC zero filter. See
the figure below for the scrubber setup.
Figure 46: CO2 Scrubber and VOC Zero Filter Combination
5 . Wait one minute for the fresh air sample to flow through the scrubber setup.
6 . Press and hold the
▲
AIR button to set the zero reading.
7 . Remove the CO
2
scrubber from the VOC zero filter. Be sure the VOC zero filter’s
tubing stays on the VOC zero filter.
8 . Reattach the CO
2
scrubber’s tubing to the open end of the scrubber.
9 . Remove the VOC zero filter from the GX-6000’s inlet fitting.
10 . Reinstall the plugs on each end of the VOC zero filter.
NOTE:
Do not store the CO
2
scrubber and VOC zero filter connected together. They
must be separated and appropriately plugged for storage.
VOC Zero Filter
CO2 Scrubber
To GX-6000