Avoid factors that may affect the normal operation of the gas detector.
1. Pay attention to regular calibration and testing.
Just like other analytical and testing instruments, toxic and harmful gas detectors use the relative comparison method for measurement. First, calibrate the instrument with a zero gas and a gas of standard concentration to obtain a standard curve, which is then stored in the instrument. During measurement, the instrument compares the electrical signal generated by the concentration of the gas to be measured with that of the standard - concentration gas, and calculates the accurate gas concentration value. Therefore, zero - calibrating the instrument at any time and regularly calibrating it are essential for ensuring accurate measurement. It should be noted that currently, many gas detectors allow for the replacement of detection sensors. However, this does not mean that a detector can be randomly paired with different detector probes. Whenever the probe is replaced, in addition to the necessary sensor activation time, the instrument must be recalibrated. Moreover, it is recommended to test the instrument's response with a standard gas before using various types of instruments to ensure that they can truly play a protective role.
2. Pay attention to the detection interference among different sensors.
Generally speaking, each sensor corresponds to a specific gas for detection, but no gas detector can be completely specific. Therefore, when selecting a gas sensor, one should try to understand the detection interference of other gases on this sensor to ensure accurate detection of the specific gas.
3. Pay attention to the lifespan of various sensors:
All types of gas sensors have a certain service life. Generally, in portable instruments, the LEL sensor has a relatively long lifespan, usually about three years; the photoionization detector can last for four years or more; the lifespan of electrochemical specific - gas sensors is relatively shorter, generally between one and two years; the oxygen sensor has the shortest lifespan, about one year. The lifespan of electrochemical sensors depends on the drying up of the electrolyte inside. So, if not used for a long time, sealing it and placing it in a lower - temperature environment can extend its service life to a certain extent. Since fixed - type instruments are relatively larger in size, the sensors in them also have a longer lifespan. Therefore, the sensors should be regularly tested, used within their validity period as much as possible, and replaced promptly once they become invalid.
