Gas detector mainly detects the concentration of gas leak instrument tools, used in chemical, metallurgical, petrochemical, municipal gas and environmental testing sites and other places. Of course, in the specific use also need to pay attention to a variety of issues, such as detection of interference, measurement range.
1, pay attention to regular calibration and testing
Toxic and harmful gas detector with other analytical instruments as well, are measured by a relatively comparative method: first with a zero gas and a standard concentration of gas calibration of the instrument, the standard curve was stored in the instrument, When measured, the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration to calculate the accurate gas concentration value. Therefore, calibration of the instrument at any time, regular calibration of the instrument is an essential measure to ensure the accuracy of the instrument work. It should be noted that: At present, many gas detectors can replace the detection sensor, however, this does not mean that one detector can be equipped with different detector probes at any time. At any time, in addition to requiring some sensor activation time to replace the probe, the instrument must be recalibrated. In addition, it is recommended that various types of equipment before use, the instrument with a standard gas response test to ensure that the instrument really play a protective role.
2, pay attention to the detection of interference between different sensors
In general, each sensor corresponds to a specific test gas, but any one of the gas detectors can not be absolutely special effects. Therefore, the choice of a gas sensor, should be as much as possible to understand the detection of other gases on the sensor interference, to ensure that it for the specific detection of specific gases.
3, pay attention to the life of various types of sensors
All kinds of gas sensors have a certain useful life, that is, life expectancy. In general, LEL sensors have a long lifetime in portable instruments and can generally be used for about three years; photoionization detectors have a lifetime of four years or longer; and electrochemical specific gas sensors have a relatively short life expectancy In one year to two years; the shortest oxygen sensor life, about a year or so. The life expectancy of electrochemical sensors depends on which of the electrolyte dry up, so if not for a long time, the seal on the lower temperature environment can extend the life of a certain. Due to the relatively large size of the stationary instrument, the life of the sensor is also longer. Therefore, the sensor should be tested at any time, as far as possible the use of the sensor during the expiration of the timely replacement.
4, pay attention to the concentration of measuring instruments measuring range
Various types of toxic and hazardous gas detectors have their fixed detection range. Only in the measurement range to complete the measurement, to ensure that the instrument accurately measured. For a long time beyond the measurement range for measurement, the sensor may cause permanent damage.
For example, LEL detectors, if inadvertently used in more than 100% LEL environment, may completely burn the sensor. The toxic gas detector, prolonged use at higher concentrations can also cause damage. Therefore, the use of fixed equipment in the event of overrun signal, immediately turn off the measurement circuit to ensure the safety of the sensor.
In short, Toxic and Hazardous Gas Detectors are a powerful tool to ensure industrial safety and the health of workers. We should according to the specific use of the environment and the needs of the occasion, select the appropriate gas detector. At present, we can choose from a variety of detectors including fixed / portable, diffusion / pumping, single / multiple gases, inorganic / organic gases, and more. Only by choosing the right gas detection equipment, can we truly do more with less, take preventive measures.
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