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To detect combustible gas, which sensor should choose?
As the main energy source in production and life, combustible gas can be seen everywhere in industrial production and daily life. Common flammable gases include hydrogen, carbon monoxide, methane, propane, ethylene, hydrogen sulfide, etc... Moreover, many flammable gases are also toxic and harmful gases, such as carbon monoxide, hydrogen sulfide, chlorine, etc.
Dec 26,2022
As the main energy source in production and life, combustible gas can be seen everywhere in industrial production and daily life. Common flammable gases include hydrogen, carbon monoxide, methane, propane, ethylene, hydrogen sulfide, etc... Moreover, many flammable gases are also toxic and harmful gases, such as carbon monoxide, hydrogen sulfide, chlorine, etc.
Once these combustible gases exceed a certain concentration, they may explode and cause fire accidents. For their detection, specific analysis should be carried out in specific situations.
Different application scenarios have different requirements for gas detectors, and also have different requirements for their core components - gas sensors. How to choose a suitable combustible gas sensor for our detector?
How to choose a combustible gas sensor?
Combustible gas sensors mainly include semiconductor type, catalytic combustion type, electrochemical type and infrared type, which are suitable for combustible gas detection in different scenarios.
1 Semiconductor type
In general domestic places, it is usually required to be able to quickly detect the leakage of combustible gas when the concentration is low. A single point of alarm can be achieved. And it must be able to meet the requirements of long-term maintenance-free, convenient for home use.
The semiconductor combustible gas sensor has a lower detection limit and a longer service life, and only the gas adsorption and desorption process exists during the detection process. Serious cooking fumes in the kitchen are less likely to remain on the surface of sensitive materials, making it the best choice for home alarms.
2 Catalytic combustion type
Catalytic combustion gas sensor is currently the most widely used sensor in the world. It has a fast response speed. Up to the lower explosion limit concentration (LEL), the output of the sensor is almost proportional to the gas concentration, so the accuracy and repeatability are very high. It is suitable for quantitative detection in coal mine, petroleum, chemical industry, gas and other fields.
However, catalytic combustion sensors work at a high temperature, and the catalyst is easily deactivated. At the same time, the silicone and sulfide released from adhesives and rubber products in the surrounding environment can easily poison the catalyst and cause the sensor to fail. In industrial places, the standard gas is generally used to regularly calibrate the alarm and adjust the magnification to prevent the sensitivity of the catalytic sensor from degrading and causing a large decrease in accuracy.
3 Electrochemical type
Due to the high toxicity of carbon monoxide, the alarm point generally does not exceed 200ppm. In order to prevent false alarms or missed alarms, it is best to use electrochemical gas sensors with high sensitivity and precision. It is suitable for the detection of low concentration carbon monoxide in the process of artificial gas and incomplete combustion.
4 Infrared
The infrared combustible gas sensor uses the principle of non-dispersive infrared (NDIR) to detect hydrocarbon combustible gases in the air. It has the advantages of good selectivity, strong anti-interference ability, and not easy to be poisoned, and does not need frequent recalibration. In recent decades, it has played an important role in industrial safety and gas detection.
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