Chapter 3 Detailed Operating Instructions
23
2. Allow the sensor to stabilize before beginning calibration. This
is accomplished by observing the output level display at the
main menu and waiting for the level to settle. Stabilization
should take 30 to 60 seconds (2 to 3 hours for the NO and
NH
3
sensors if the bias has not been maintained).
3. Continue on to the calibration procedures.
Toxic Gas Zero
To perform zero adjustment:
1. 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
2. Press the RECORD button. The IAQ Monitor will display the
following screen:
▲/▼ For Choices
RECORD Selects
****Clear Data****
Press ON/OFF To Exit
3. Press the UP ARROW button repeatedly until the third line on
the IAQ Monitor displays:
** Toxic Zero Adjust **
3. 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
4. If you wish to use zero gas instead of fresh air zero please
proceed to Toxic Gas Zero – Using zero gas
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