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Sending command method
:
Zero and Span point calibration can be achieved by sending a calibration command to the sensor via the serial
port (URAT). Zero and SPAN point calibration commands are as follows:
Self-calibration:
After the module works for some time, it can judge the zero point intelligently and do the zero calibration
automatically. The calibration cycle is every 24 hours since the module is power on. The zero point is 400ppm.
This method is suitable for office and home environment, not suitable for agriculture greenhouse, farm,
refrigerator, etc.. If the module is used in latter environment, please turn off this function.
9. Notes
9.1 Please avoid the pressure of its gilded plastic chamber from any direction, during welding, installation, and
use.
9.2 When placed in small space, the space should be well ventilated, especially for diffusion window.
9.3 The module should be away from heat, and avoid direct sunlight or other heat radiation.
9.4 The module should be calibrated termly, the suggested period is not longer than 6 months.
9.5 Do not use the sensor in the high dusty environment for long time.
9.6 To ensure the normal work, the power supply must be among 4.5V~5.5V DC rang, the power current must be
not less than 150mA. Out of this range, it will result in the failure of the sensor. (The concentration output is low,
or the sensor can not work normally.)
9.7 During the zero point calibration procedure by manual, the sensor must work in stable gas environment