The principle of gas detectors
Release time:
2025-09-25
Gas detectors detect gas concentrations through various sensor technologies. Common principles include catalytic combustion, electrochemistry, semiconductors, and infrared, etc.
Gas detectors detect gas concentrations through various sensor technologies. Common principles include catalytic combustion, electrochemistry, semiconductors, and infrared, etc.
The working principle of gas detectors
The working principle of gas detectors is mainly based on different types of sensor technologies. The following are several common principles of gas detectors:
Catalytic combustion sensor: This type of sensor detects gas concentration by detecting resistance changes caused by the oxidation combustion of flammable gases. It needs to operate in an oxygen-containing environment and is suitable for the detection of flammable gases, but it is prone to poisoning from certain substances (such as sulfides).
Electrochemical sensor: An electrochemical sensor generates electrical signals through the reaction between gas and electrodes, and usually requires oxygen to maintain its function. Its stability may be disturbed by changes in humidity and pressure, making it suitable for detecting toxic gases.
Semiconductor sensors: They operate based on the resistance changes caused by gas adsorption and have high sensitivity, but their anti-interference ability is relatively weak and they are easily affected by background gases.
Infrared sensor: This type of sensor analyzes gases through infrared spectroscopy and is suitable for the detection of low-carbon chain hydrocarbons and carbon dioxide. It features high sensitivity and rapid response.
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