Chapter 3 Detailed Operating Instructions
18
We recommend using span calibration gases as follows:
Programmed CO
2
Span Gas
CO
2
Sensor Range Concentration Recommended
0 to 5,000 ppm 1,000 or 5,000 ppm CO
2
0 to 20,000 ppm at least 15,000 ppm CO
2
Follow these steps to calibrate the CO
2
sensor:
1. Unscrew and remove the toxic sensor cap (see the IAQ Monitor
instrument diagram in the beginning of this chapter ).
2. Slide the calibration adapter over the wand until the "O" ring in
the bottom of the adapter slides over the handle of the wand.
3. Turn the IAQ Monitor on. It will display the present readings.
4. Wait for the sensors to stabilize (when the readings level off, the
sensor is stabilized)
5. Using the supplied tubing, connect a source of Nitrogen (N
2
) to
the CO
2
inlet fitting of the Calibration Adapter.
6. Press the UP ARROW button (press the UP ARROW button
one more time if the backlight was off). The IAQ Monitor will
display the following screen:
Press Record
for Function Menu
▲/▼ To Continue
7. Press the RECORD button. The IAQ Monitor will display the
following screen:
▲/▼ For Choices
RECORD Selects
****Clear Data****
Press ON/OFF To Exit
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