(1) Pay attention to regular calibration and testing.
The toxic and harmful gas detectors are also measured by a relatively comparative method like other analytical detection instruments: first calibrate the instrument with a zero gas and a standard concentration of gas, and obtain the standard curve and store it in the instrument. During the measurement, the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration to calculate an accurate gas concentration value.
Therefore, zeroing the instrument at any time and calibrating the instrument frequently are indispensable tasks to ensure accurate measurement of the instrument. It should be noted that at present, many gas detectors can be replaced by detection sensors, but this does not mean that a detector can be equipped with different sensors at any time. Whenever the sensor needs to be activated for a certain time when the sensor is replaced, the instrument must be recalibrated. In addition, it is recommended that various types of instruments be tested for response to the instrument's calibration gas before use to ensure that the instruments really play a protective role.
(2) Pay attention to the detection interference between various sensors.
In general, each sensor corresponds to a specific detection gas, but the sensor itself has a cross-reaction, which may produce numerical changes to the gas of other components. Therefore, when choosing a gas sensor, you should understand the detection interference of other gases to the sensor as much as possible to ensure its accurate detection of a specific gas.
(3) Pay attention to the life of various sensors:
All kinds of gas sensors have a certain service life. Generally speaking, in portable instruments, the life of LEL combustible sensors is longer, and they can generally be used for about three years; the life of photoionization detectors is four years or longer The life of the electrochemical specific gas sensor is relatively short, generally one year to two years; the life of the oxygen sensor is short, about one year. The life of the electrochemical sensor depends on the drying of the electrolyte, so if it is not used for a long time, it can be extended to a certain life by sealing it in a lower temperature environment. Therefore, the sensor should be detected at any time, as far as possible within the validity period of the sensor, once it fails, replace it in time.
(4) Pay attention to the concentration measurement range of the detection instrument:
All kinds of toxic and harmful gas detectors have their fixed detection range. Only when the measurement is completed within its measurement range can the instrument be accurately measured. If the measurement is exceeded for a long time, the sensor may be damaged.
For example, if the LEL detector is accidentally used in an environment over 100LEL, it may burn the sensor completely. The gas detector can also be damaged if it is used at a higher concentration for a long time. Therefore, if a fixed instrument sends out an overrun signal when it is in use, the measurement circuit should be turned off immediately to ensure the safety of the sensor.
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