197 • IR CO
2
Start Up and Normal Operation GX-6000 Operator’s Manual
IR CO
2
Start Up and Normal Operation
For instructions to startup and use a GX-6000 that includes an infrared CO
2
sensor, reference “Start Up” on page 19, “Measuring Mode, Normal
Operation” on page 29, and “Measuring Mode, Alarms” on page 36. Follow
these instructions keeping the following special considerations in mind:
• A background level of CO
2
exists in fresh air. Table 25 below indicates a
typical gas reading in fresh air.
• When you perform a demand zero during start up, operation, or
calibration, you must use the CO
2
scrubber provided with the instrument
to remove background CO
2
from the air being sampled. See “Performing
a Demand Zero for Carbon Dioxide Sensors” below.
If you have a PID sensor in your instrument, see “Performing a Demand
Zero for Instruments with a Carbon Dioxide Sensor and a PID Sensor” on
page 198.
• Since there is a background of CO
2
in air, do not use the AUTO ZERO
feature that can be turned on and off in Maintenance Mode. The factory
setting for the feature is OFF.
Performing a Demand Zero for Carbon Dioxide Sensors
When setting the zero reading, the carbon dioxide scrubber shipped with the
GX-6000 allows you to eliminate carbon dioxide normally found in fresh air.
To perform a demand zero, do the following:
1 . Remove the tubing from the side of the scrubber that does not have an
arrow pointing to it.
Table 25: Carbon Dioxide Fresh Air Readings
Sensor Range
Approximate Fresh Air
Reading
0 - 10 %vol 0.04 %vol
0 - 10,000 ppm 400 ppm
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