Any gas detector needs to be calibrated after a long period of use, even if it is a four-in-one gas detector. Otherwise, when the four-in-one gas detector itself sensor loss, the use of the environment or the influence of interference gas, its accuracy is bound to decline, thus affecting the normal operation of the detection work. Do you know how to calibrate 4-in -1 gas detector ? The following is a brief introduction by Yiyuntian:

four-in-one gas detector calibration method:

1. under the normal detection state of the four-in-one gas detector, press the up and down arrows at the same time to enter the calibration state.

2. at this time, the methane subscript of the four-in-one gas detector flashes, and the methane can be calibrated:

a. press the function key "OK" for a long time, the instrument is zeroed and automatically enters the ventilation state, and the channel displays "-". Methane standard gas can be introduced at this time (please do not ventilate before entering the ventilation state!) , The instrument will automatically compare and judge whether the gas has reached a stable state. The process takes about tens of seconds to one minute. When the gas reaches a stable state, the display screen symbol "---" will become a display value.

B. Use the up and down arrows to adjust the displayed value so that the displayed value is consistent with the concentration of the standard gas.

c. press the function key OK for a long time, and the instrument will store the calibration result. after the calibration of this channel is completed, the instrument will automatically enter the calibration of the next channel, and the subscript of the next channel will start flashing.

D. the same steps can be used to calibrate carbon monoxide, oxygen and hydrogen sulfide.

E. after the instrument enters the calibration state, if there is no ventilation or other operation, the instrument will automatically return to the detection state after five minutes. if one way does not need calibration, press the function key OK You can skip this road and go to the next calibration.

In summary, it is the calibration method of the four-in-one gas detector. In the process of calibration, the standard gas for calibration must be the standard gas from the production unit recognized by the national metrology department, and the concentration value of the standard gas for calibration is preferably half of the range of the instrument. Please do not use the gas concentration with too small relative range for calibration. Each channel must be calibrated separately, and mixed gas cannot be calibrated at the same time.