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Portable gas detector life and parameter selection points
Portable Gas Detector As the new darling of gas detectors, with the advancement of gas detection technology, portable gas detectors can be equipped with multiple gases (inorganic / required) in one main unit according to customer requirements and different places of use. Organic) sensors for the detection of single gases and multiple gases. Portable gas alarms are characterized by small size, light weight, fast response, and simultaneous multi-gas concentration display.
A, pay attention to regular calibration and detection during the use of portable gas alarms
At present, many gas detectors can replace the detection sensor, but this does not mean that a 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. Combustible gas alarms and toxic gas alarms are also measured in a relatively comparative manner, as are 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 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 an accurate gas concentration value. 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:
B. Pay attention to the detection interference between different sensors.
Although the hybrid gas detector can detect a variety of other gases at the same time, the portable gas detector is not any combination of toxic and harmful gases. One
In general, each gas sensor corresponds to a specific detection gas, but any gas detector cannot be absolutely special effects. 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.
C, pay attention to the life of each portable gas alarm sensor
All types of gas sensors have a certain life span, 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.
D. Pay attention to the concentration measurement range of the gas detection instrument:
Portable gas detectors have a fixed detection range for all types of toxic and hazardous gas detectors. 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 beyond the measurement range, it may cause permanent damage to the sensor. For example, if the LEL detector is used in an environment that exceeds 100% LEL, it is possible to completely burn the sensor. The toxic gas detector can cause damage when used for a long time at a higher concentration. Therefore, if the stationary instrument emits an over-limit signal during use, the measurement circuit should be turned off immediately to ensure the safety of the sensor.
Paying attention to the above items during the use of the portable gas detector will increase its service life and also improve the measurement accuracy!