7
2. Set Alarm Threshold
If the measured CO2 value exceeds the selected alarm threshold, an LED will flash, an audible
alarm will sound, and the monitor will vibrate. 3 alarm thresholds can be selected: a 5,000ppm
CO2 alarm, a 5,000ppm TWA CO2 alarm and a 30,000ppm (3%) STEL CO2 alarm, See
Appendix A
to determine which alarm is best for your application.
4.
Press Menu
once to select the alarm function.
5.
Press Next
to change the alarm threshold.
6.
Press Set
to save and return to normal display.
3. Set Temperature Units
Select temperature scale °Centigrade or °Fahrenheit.
1.
Press Menu
2 times to select temperature units.
2.
Press Next
to switch between °C or °F.
3.
Press Set
to save and return to normal display.
4. Calibration
The monitor should be calibrated at least annually and can be calibrated either atmospheric
(outdoor 400 PPM CO2) or Zero with 100% Nitrogen (
𝑁𝑁
2
) 0% CO2.
Both calibrations require the unit to be powered on.
Zero calibration procedure – Place the tubing from the calibration gas directly on the back-left
hand side hole near the clip. This hole is directly above the sensor. Run the Nitrogen until the
ppm level on the LCD displays approximately 0 ppm. Once stabilized, do steps 1-4 (See Below).
Ambient calibration procedure – Expose the unit to outdoor air until it’s stabilized (3-5 minutes).
Then do steps 1-4 (See below).
