The toxic gas detector is also measured by a rel […]
The toxic gas detector is also measured by a relatively comparative method, like other analytical instruments. The instrument is first calibrated with a zero gas and a standard concentration of gas, and the standard curve is stored in the instrument. When the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration, the accurate gas concentration value is calculated.
Therefore, zero calibration of the instrument at any time and regular calibration of the instrument are essential tasks to ensure accurate measurement of the instrument. It should be noted that many gas detectors can replace the detection sensor at present, but this does not mean that one detector can be equipped with different detector probes at any time. Whenever the probe is replaced, in addition to a certain sensor activation time, the instrument must be recalibrated. In addition, it is recommended that the instrument be responsive to the instrument before it is used to ensure that the instrument actually protects.
Second, pay attention to the detection interference between different sensors
In general, each sensor corresponds to a specific test gas, but any gas detector cannot be absolutely special. Therefore, when selecting a gas sensor, it should be as close as possible to the detection interference of other gases to the sensor to ensure its accurate detection of a specific gas.
Third, pay attention to the life of various types of sensors
All kinds of gas sensors have a certain service life, that is, life. Generally speaking, in portable instruments, LEL sensors have a long life and can be used for about three years; photoionization detectors have a life span of four years or longer; electrochemical specific gas sensors have a relatively short life span. In one to two years; the life of the oxygen sensor is the shortest, about a year or so. The life of an electrochemical sensor depends on the dryness of the electrolyte, so if it is not used for a long time, it can be extended to a lower temperature environment to extend the service life. Due to the relatively large size of the fixed instrument, the life of the sensor is also longer. Therefore, the sensor should be tested at any time, as much as possible during the life of the sensor, and if it fails, replace it in time.