Airmonitor Plus uses a high-precision NDIR CO₂ sensor which requires calibration. For best accuracy, perform a quick calibration before first use (and any time readings seem off after transport).
Quick Steps
- Power Up Press the rear button to turn on the Airmonitor.
- Ventilate (Very important) Place the Airmonitor in fresh, well-ventilated air, ideally outdoors in shade or at an open window, for 5 minutes. Keep it away from vehicles, kitchens, or any combustion sources.
- Start Calibration Quickly press the rear button three times. You’ll hear a beep and the CO₂ display will show “--” to indicate calibration has started. After a few seconds, normal readings will resume.
- Auto-Stabilization (Temp/RH) Temperature and humidity sensors self-calibrate over the next few hours during normal use.
Tips for a Reliable Calibration
- Keep the device still during calibration.
- Ensure the battery isn’t critically low (or keep it plugged in).
- If you can’t go outside, use an open window with a breeze for several minutes first.
Troubleshooting
- No beep / “--” doesn’t appear: Make sure the device is on and press the button three times quickly.
- Readings still look off indoors: Repeat the calibration in clean outdoor air and avoid nearby people or emission sources.
- Large temperature jump after moving rooms: Allow 1–3 hours for temperature/humidity to fully settle.
Sep 16, 2025