How to calibrate the Folium CO₂ sensor

To keep CO₂ readings accurate, calibrate the Folium CO₂ sensor outdoors every 6 months using these instructions below.

Step	Calibration	Notes
1	Take the Folium sensor(s) outside and wait 5 minutes for the sensor(s) to stabilise.	Note: The time is to allow for the sensor to start accurately reading it’s new environment. Avoid breathing towards the unit for these steps as the additional CO₂ contained in exhaled human breath can cause the calibration to be incorrect.
2	Press and hold the Power Button on the bottom of the Folium sensor for approx. 30 seconds until the unit lights up orange.	Note: If the button is only pressed or is released early the unit will flash green and the user will have to wait until the flashing stops to restart the calibration.
3	When the orange flashing finishes with a green flash the calibration is complete.	Note: the calibration technique assumes atmospheric CO₂ is 400ppm and that the sensors CO₂ sensor is reading atmospheric conditions.
4	Repeat calibration every 6 months.	** **

If you accidently release the power button during the calibration period, the lights will light up green. Please wait for this to stop and then try again.