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Matters needing attention in the use of gas detector
2024-10-12
（2) Pay attention to regular calibration and testing.
toxic and harmfulGas detectorIt is also the same as other analytical and testing instruments, which are measured by a relative comparison method: first, the instrument is calibrated with a zero gas and a standard concentration gas, and the standard curve is stored in the instrument. When measuring, the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration, and calculates the accurate gas concentration value.
Therefore, it is necessary to calibrate the instrument at any time and to calibrate the instrument regularly to ensure the accuracy of the instrument measurement. It should be noted that there are manyGas detectorAll detection sensors can be replaced, but this does not mean that a detector can be equipped with different sensors at any time. Whenever a sensor is replaced, the instrument must be recalibrated in addition to a certain sensor activation time. In addition, it is suggested that all kinds of instruments should be tested with standard gas before use to ensure that the instruments really play a protective role.
(2) Pay attention to the detection interference between various sensors.
Generally speaking, each sensor corresponds to a specific detection gas, but the sensor itself is cross-reactive, which may cause numerical changes to other components of the gas. Therefore, when selecting a gas sensor, we should know as much as possible the detection interference of other gases on the sensor, so as to ensure its accurate detection of specific gases.
(3) pay attention to the life of various types of sensors:
All kinds of gas sensors have a certain service life. Generally speaking, in portable instruments, LEL combustible gas sensors have a long service life, which can be used for about three years. The life of photoionization detector is four years or more. The life of electrochemical specific gas sensors is relatively short, usually one to two years. The life of oxygen sensors is short, about one year. The life of the electrochemical sensor depends on the drying up of the electrolyte, so if it is not used for a long time, it can be sealed in a lower temperature environment to extend the service life. Therefore, it is necessary to detect the sensor at any time, use it as much as possible within the validity period of the sensor, and replace it in time once it fails.
(4) Pay attention to the concentration measurement range of the testing 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. And for a long time beyond the measurement range of measurement, it may cause damage to the sensor.
For example, the LEL detector, if accidentally used in more than 200LEL environment, it is possible to completely burn the sensor. The gas detector, working for a long time at a higher concentration will also cause damage. Therefore, if the fixed instrument sends out an overrun signal during use, the measurement circuit should be closed immediately to ensure the safety of the sensor.
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