Attention should be paid to the following items when using toxic and harmful gas detector:

1. Pay attention to regular calibration and testing. The toxic and harmful gas detector is the same as other analysis and detection instruments, which are determined by the relative comparison method: firstly, the instrument is calibrated with a zero gas and a standard concentration gas, and the standard curve is obtained and stored in the instrument. During the determination, the instrument compares the electric signal generated by the concentration of the gas to be measured with the electric signal of the standard concentration, The accurate gas concentration is calculated. Therefore, it is necessary to zero the instrument at any time and calibrate the instrument regularly to ensure the accuracy of instrument measurement.

2. Pay attention to the simultaneous interpreting of different sensors. Generally speaking, each sensor corresponds to a specific detection gas, but any kind of gas detector can not be excellent. Therefore, when selecting a kind of gas sensor, we should try our best to understand the detection interference of other gases to the sensor to ensure its accurate detection of specific gases.

3. Pay attention to the service life of all kinds of sensors: all kinds of gas sensors have a certain service life, that is, service life. Generally speaking, in portable instruments, the life of the LEL sensor is long, and it can be used for about three years; The lifetime of the photoionization detector is four years or longer; The lifetime of the electrochemical specific gas sensor is relatively short, generally in one to two years; The life of oxygen sensor is short, about one year. The life of an electrochemical sensor depends on the drying of electrolyte, so if it is not used for a long time, its service life can be extended if it is sealed in a low-temperature environment. Because the volume of the fixed instrument is relatively large, the life of the sensor is also longer. Therefore, it is necessary to detect the sensor at any time, use it within the validity period of the sensor as far as possible, and replace it in time in case of failure.