The issues that need to be noted when using a gas detector are:
① Pay attention to regular calibration and testing
Toxic and harmful gas detectors, like other analytical and detection instruments, are measured using a relative comparison method: first, the instrument is calibrated with a zero gas and a standard concentration of gas, and the standard curve is stored in the instrument. During the measurement, the instrument compares the electrical signal generated by the gas concentration to the electrical signal of the standard concentration, and calculates the accurate gas concentration value. Therefore, zero calibration of the instrument at any time and frequent calibration of the instrument are necessary tasks to ensure accurate measurement of the instrument. It should be noted that many gas detectors can currently replace their detection sensors, 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 requiring a certain activation time for the sensor, the instrument also needs to be recalibrated. In addition, it is recommended to conduct response testing on the standard gas used in various instruments before use, in order to ensure the accuracy and effectiveness of the instruments.
② Pay attention to the detection interference between different sensors
Generally speaking, each sensor corresponds to a specific detection gas, but no sensor is absolutely specific. Therefore, when selecting a gas sensor, it is important to understand as much as possible the detection interference of other gases on the sensor, in order to ensure its accurate detection of specific gases.
③ Pay attention to the lifespan of various sensors
All types of gas sensors have a certain service life, that is, their lifespan. Generally speaking, in portable instruments, combustible gas sensors have a longer lifespan and can be used for about three years; The lifespan of the photoionization detector is four years or more; The lifespan of electrochemical specific gas sensors is relatively short, usually between one to two years; The lifespan of an oxygen sensor is the shortest, around one year (the lifespan of an 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 extend its lifespan to a certain extent). Fixed instruments have a longer lifespan due to their relatively large volume. Therefore, it is necessary to use the sensor within its validity period as much as possible, and if it fails, replace it in a timely manner.
④ Pay attention to the concentration measurement range of the detection instrument
All types of toxic and harmful gas detectors have their fixed detection range. Only by completing the measurement within its measurement range can the instrument ensure accurate measurement. If the measurement exceeds the measurement range for a long time, it may cause long-term damage to the sensor. For example, if a combustible gas detection instrument is accidentally used in an environment exceeding 100% LEL, it may effectively burn the sensor. The use of toxic gas detectors at high concentrations for extended periods of time can also cause damage. Therefore, if a fixed instrument emits an overrun signal during use, the measuring circuit should be immediately closed to ensure the safety of the sensor.
In short, toxic and harmful gas detectors are powerful tools to ensure industrial safety and worker health. We need to consider the specific usage environment and requirements
