1. Pay attention to regular calibration and testing
The toxic and harmful gas detector, like other analytical testing instruments, is measured by a relative method: first, use a zero gas and a standard concentration of gas to calibrate the instrument, and obtain a standard curve and store it in the instrument. During the measurement, the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration, and calculates the accurate gas concentration value. Therefore, zero-calibrating the instrument at any time and calibrating the instrument frequently are essential work to ensure the accuracy of the instrument's measurement.
It should be noted that many gas detectors can replace the detection sensor at present, but this does not mean that a detector can be equipped with different detector probes at any time. Whenever a probe is replaced, in addition to a certain sensor activation time, the instrument must be recalibrated. In addition, it is recommended to perform response detection on the standard gas used in the instrument before various instruments are used to ensure that the instrument really plays a protective role.
2. Pay attention to the detection interference between various sensors
Generally speaking, each sensor corresponds to a specific detection gas, but it is impossible for any kind of gas detector to be absolutely special. Therefore, when choosing a gas sensor, it is necessary to understand the detection interference of other gases on the sensor as much as possible to ensure its accurate detection of a specific gas.
3. Pay attention to the life of various sensors
All kinds of gas sensors have a certain service life, that is, life. Generally speaking, in portable instruments, LEL sensors have a longer lifespan and can generally be used for about three years; photoionization detectors have a lifespan of four years or longer; electrochemical specific gas sensors have a relatively short lifespan, generally In one to two years; the oxygen sensor has the shortest lifespan, probably around a year. The life of the electrochemical sensor depends on the drying of the electrolyte, so if it is not used for a long time, sealing it in a lower temperature environment can prolong the service life. Fixed instruments have a longer sensor life due to their relatively large size. Therefore, it is necessary to test the sensor at any time, use it within the validity period of the sensor as much as possible, and replace it in time once it fails.
4. Pay attention to the concentration measurement range of the detection instrument
All kinds of toxic and harmful gas detectors have their fixed detection range. Only when the measurement is completed within its measurement range can the instrument perform the measurement accurately. If the measurement is performed outside the measurement range for a long time, it may cause permanent damage to the sensor.
