Regular Calibration and Testing Are Essential for Gas Detectors
Gas detectors are operated and measured using a relative comparison method, first calibrating the gas detector with a zero gas and a standard concentration of gas. Toxic and harmful gas detectors are also similar to other analytical gas detectors. The standardized curve is stored in a gas detector. During measurement, the gas detector compares the electrical signal generated by the concentration of the gas to be measured with the electrical signal of the standard concentration, and calculates the accurate gas concentration value.
Therefore, it is essential to perform zero calibration on the gas detector at any time and regularly calibrate the gas detector to ensure accurate measurement. It should be noted that many gas detectors currently have replaceable detection sensors, but this does not mean that a detector can be equipped with different detector probes at any time. Whenever replacing the probe, in addition to requiring a certain sensor activation time, it is also necessary to recalibrate the gas detector operation. In addition, it is recommended to perform response testing with standard gas before using various gas detectors to ensure that the gas detectors truly function for maintenance.
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.
