Calibration Zero Function:
In order to facilitate the user to calibrate the zero point, the sensor has three zero calibration modes:
manual zero calibration, command zero calibration, and automatic zero calibration.
Zero calibration function refers to calibration 400ppm.
Manual zero calibration
Manual calibration of the zero point is to input the low level (0V) of the sensor's HD pin to calibrate the
zero point, and the low level lasts for more than 7 seconds.
Make sure the sensor is stable for more than 20 minutes at 400 ppm before calibrating the zero point.
Command calibration:
Please refer to the serial zero calibration command.
Automatic calibration function:
The automatic calibration function means that the sensor intelligently judges the zero point according to
the environmental concentration and calibrates itself after continuous operation for a period of time.
The calibration cycle is automatically calibrated every 24 hours from the power-on operation. The zero
point for automatic calibration is 400 ppm.
The automatic zero calibration function is suitable for office environment and home environment.
However, it is not applicable to agricultural greenhouses, farms, cold storages, etc. In such places, the
automatic zero calibration function should be turned off. After shutdown, the user should periodically
perform zero-point detection on the sensor, and if necessary, perform a zero calibration or manual zero
calibration.
Precautions
During the welding, installation and use of the sensor, the gold-plated plastic cavity should be
protected from any direction of pressure.
If the sensor needs to be placed in a small space, the space should be well ventilated, especially if the
two diffusing windows should be in a well ventilated position.
Keep the sensor away from heat and avoid direct sunlight or other heat radiation.
