1. The gas detector also needs to be calibrated regularly to ensure the accuracy of detection. The calibration process is called "calibration". According to GBT50493-20 19 Design Standard for Detection and Alarm of Combustible and Toxic Gases, the calibration cover is used for calibration.

2. Introduce standard gas into the detector, and calibrate the detector after the indicated value is stable. In the setting state, press the "Move Down" button to move the function indicator cursor. When the cursor indicates "Calibration", press the "Confirm" button, and the built-in calibration value of the detector will be displayed at the bottom of the screen.

3. At this time, select the number of digits of the calibration value by "Move Right" and change a value by "Add". After entering the standard gas concentration, press the "Confirm" button and the confirmation screen will be displayed.

4. If the calibration is confirmed at this time, press the "Confirm" button, "SUCC" will be displayed at the bottom of the screen, and the red backlight will light up, and the calibration is successful.

5. If you want to cancel the calibration, press the "Cancel" button, and "Failed" will be displayed at the bottom of the screen to cancel the calibration.