BenQ RP8603 User Manual page 51

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Android system interface
CO Sensor
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The concentration value of CO sensor may vary depending on the environment such as
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temperature, humidity, and placement (by windows or under air conditioning). This means
that the CO sensor will always accurately measure the increments between ppm levels,
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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 CO sensor has a self-correction mechanism to make the sensor more in line with
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the current installation environment, so that the value can be more accurate.
If your display is not used or stored for a long time, please calibrate before using the CO
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senor. To start the calibration, follow the directions.
Auto calibration
To provide correction for the optimal CO concentration for the current environment,
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the calibration mechanism will collect the CO concentration value for 25 consecutive
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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 display and make sure that the display is in an environment with good
ventilation, to ensure a better calibration result.