Detection Interference Among Different Sensors of Various Gas Detectors
Generally speaking, each sensor corresponds to a specific gas being detected, but no gas detector can be highly effective. Therefore, when choosing a gas sensor, it is important to understand as much as possible the detection interference of other gases on the sensor to ensure accurate detection of specific gases.
Pay attention to the lifespan of various sensors:
All types of gas sensors have a certain service life, that is, 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 between one to two years; The lifespan of oxygen sensors is short, about one year. The lifespan of electrochemical sensors depends on the drying of the electrolyte, so if they are not used for a long time, sealing them in a lower temperature environment can extend their service life to a certain extent. Fixed instruments have a relatively large volume and longer sensor lifespan. Therefore, sensors should be tested at all times and used within their effective period as much as possible. Once they fail, they should be replaced in a timely manner.
Pay attention to the concentration measurement range of the testing instrument:
All types of toxic and harmful gas detectors have their fixed detection range. Only by completing the measurement within its measuring range can the instrument ensure accurate measurement. However, measuring beyond the measurement range for a long time may cause significant damage to the sensor.
For example, if the LEL detector is accidentally used in an environment with more than 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 accuracy of the sensor.
