Chapter 3 Detailed Operating Instructions
26
Follow these steps to perform a zero adjustment on the oxygen
sensor:
NOTE: Use a 1 liter per minute flow rate regulator when
calibrating.
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. Using the supplied tubing, connect the bottle of pure nitrogen
to the toxic gas inlet fitting of the calibration adapter.
4. 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
5. Press the RECORD button. The IAQ Monitor will display the
following screen:
▲/▼ For Choices
RECORD Selects
****Clear Data****
Press ON/OFF To Exit
6. Press the UP ARROW button repeatedly until the third line on
the IAQ Monitor displays:
** Toxic Span Adjust **
7. Press the RECORD button. The IAQ Monitor will display the
toxic zero calibration menu:
Apply Zero / Fresh Air
H2S X.Xppm
Press RECORD To Zero
Press ON/OFF To Exit
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