TrolMaster Environmental Sensor Calibration -- CO2

*If the CO2 sensors are not reading correctly, these sensors can easily be calibrated by the user. Follow the procedures below.*

*Note: Check your CO2 calibration once per year to avoid “annual “drift” of the CO2 sensors.

To calibrate the CO2 sensors on the TrolMaster controllers, we recommend using the “outdoor ambient air” method. Outdoors the CO2 level around the world is approximately 410ppm in the year 2021. If the CO2 sensor is operated outdoors, it should always read about 390-430ppm.

Follow the process below to first check, and then recalibrate the CO2.

1)  Temporarily connect your CO2 sensor to the TrolMaster controller using a RJ12 cable long enough to allow the CO2 sensor to be brought outdoors so it can sample outdoor air which is always about 410ppm. Hang the sensor out an open window or door.

2)  Once the sensor is connected and located outdoors, allow the sensor to remain unattended for at least 10-15 minutes.

3)  After 10-15 minutes, check the CO2 reading. If the reading is between 390 and 430 ppm, that is pretty good. You likely do not have to calibrate the sensor.

4)  If the sensor reads below 390 or above 430, you should re-calibrate the CO2 sensor.

5)  Select 410ppm on the calibration page, and then press Enter.

6)  The CO2 sensor will be calibrated. When complete, the controller will return to normal operation. The CO2 sensor can be re-installed.