How to choose the appropriate toxic and harmful gas detector
At present, with the development of manufacturing technology, portable multi gas (composite) detectors are also a new choice for us. Due to the fact that this detector can be equipped with multiple gas (inorganic/organic) detection sensors on a single host, it has the characteristics of small size, light weight, fast response, and simultaneous display of multiple gas concentrations. More importantly, the pump suction composite gas detector is cheaper and more convenient to use than multiple single diffusion gas detectors. It should be noted that when selecting such detectors, instruments with separate switch functions for each sensor can be chosen to prevent damage to one sensor from affecting the use of other sensors. At the same time, in order to avoid blockage of the suction pump due to water ingress, it is safer to choose instruments with intelligent pump designs that have pump stop alarms.
Precautions when using a gas detector:
1) Pay attention to regular calibration and testing.
Toxic and harmful gas detectors, like other analytical and detection instruments, use a relative comparison method for measurement: first, calibrate the instrument with a zero gas and a standard concentration gas, obtain a standard curve, and store it in the instrument. During measurement, the instrument compares the electrical signal generated by the concentration of the gas to be measured with the electrical signal of the standard concentration to calculate the accurate gas concentration value. Therefore, zeroing the instrument at any time and regularly calibrating the instrument are essential tasks to ensure accurate measurement. It should be noted that many gas detectors currently have replaceable detection sensors, but this does not mean that a detector can be equipped with different detector probes at any time. Whenever replacing the probe, in addition to requiring a certain sensor activation time, the instrument must also be recalibrated. In addition, it is recommended to perform response testing on the standard gas used in various instruments before use to ensure that the instruments truly provide protection.
2) Pay attention to the detection interference between different sensors.
Generally speaking, each sensor corresponds to a specific gas being detected, but no gas detector can be absolutely effective. Therefore, when choosing a gas sensor, it is important to understand as much as possible the detection interference of other gases on the sensor to ensure accurate detection of specific gases.
3) Pay attention to the lifespan of various sensors:
All types of gas sensors have a certain service life, that is, lifespan. Generally speaking, in portable instruments, LEL sensors have a longer lifespan and can be used for about three years; The lifespan of the photoionization detector is four years or longer; The lifespan of electrochemical specific gas sensors is relatively short, usually between one to two years; The lifespan of oxygen sensors is the shortest, about one year. The lifespan of electrochemical sensors depends on the drying of the electrolyte, so if they are not used for a long time, sealing them in a lower temperature environment can extend their service life to a certain extent. Fixed instruments have a relatively large volume and longer sensor lifespan. Therefore, sensors should be tested at all times and used within their effective period as much as possible. Once they fail, they should be replaced in a timely manner.
