There are several factors that influence 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 no gas detector can be special. Therefore, when selecting a gas sensor, efforts should be made to understand the detection interference of other gases on the sensor, in order 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 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, zeroing the instrument at any time and regularly calibrating 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. At any time, when replacing the probe, in addition to requiring a certain amount of sensor activation time, 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 lifespan of the photoionization detector is four years or longer; The lifespan of electrochemical specific gas sensors is relatively short, usually one to two years; The lifespan of oxygen sensors is the shortest, 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, sensors should be tested at all times and used as much as possible within their validity period. If they fail, they 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 safety damage to the sensor. For example, if an LEL detector is accidentally used in an environment exceeding 100% LEL, it may completely burn out the sensor. Toxic gas detectors, when used at high concentrations for extended periods of time, can also cause damage. Therefore, if a fixed instrument emits an over limit signal during use, the measurement circuit should be immediately turned off 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, etc. Only by selecting the appropriate gas detection instrument can we truly achieve twice the result with half the effort and prevent potential problems.
