Discussion on Several Factors Influencing the Use of Gas Detectors
1、 Pay attention to the detection interference between different sensors
Generally speaking, each sensor corresponds to a specific detection gas, but any gas detector cannot be special. Therefore, when selecting a gas sensor, it is important to understand the detection interference of other gases on the sensor as much as possible to ensure its accurate detection of specific gases.
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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 essential tasks to ensure accurate measurement. 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 must also be recalibrated. In addition, it is recommended to conduct response testing on the standard gas used in various instruments before use to ensure that the instruments truly play a protective role
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, LEL sensors have a longer lifespan and can be used for about three years; The service life 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 the oxygen sensor is short, approximately 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 service life to a certain extent. Therefore, it is necessary to detect the sensor at any time and use it within its validity period as much as possible. Once it fails, it should be replaced 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 significant damage to the sensor. For example, if an LEL detector is accidentally used in an environment exceeding 100% LEL, it may completely 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.
At present, there are various combinations of detectors available for us to choose from, including fixed/portable, diffusion/pump suction, single gas/multi gas, inorganic gas/organic gas, and so on. Only by selecting the appropriate gas detection instrument can we truly achieve twice the result with half the effort and prevent potential risks.
