BenQ RP7501K User Manual page 51

Android system interface 47
CO2 Sensor
The concentration value of CO2 sensor may vary depending on the environment such as
temperature, humidity, and placement (by windows or under air conditioning). This
means that the CO2 sensor will always accurately measure the increments between ppm
levels, but the baseline of the measurement may shift over time.
It is normal if the concentration value is slightly higher or lower than its original
calibration.
The CO2 sensor has a self-correction mechanism to make the sensor more in line with
the current installation environment, so that the value can be more accurate.
To start the calibration, please follow the directions.
Auto calibration
To provide correction for the optimal CO2 concentration for the current environment,
the calibration mechanism will collect the CO2 concentration value for 25 consecutive
hours to meet the temperature and humidity of the current space.
During the automatic calibration, do not interrupt or turn off the power supply. Do not
move the IFP and make sure that the device is in an environment with good ventilation,
to ensure a better calibration result.