The Application of Toxic and Harmful Gas Detectors in Industry
In reality, many of the gases encountered in industrial and sanitary aspects are mixtures of organic and inorganic gases. However, due to various reasons, our current understanding of toxic and harmful gases is still more concentrated on combustible gas detectors, gas detectors for gases that can cause acute poisoning (such as hydrogen sulfide, hydrocyanic acid, etc.), as well as some common toxic gas (such as carbon monoxide) detectors and oxygen detectors. Therefore, this article will first focus on introducing these types of detectors, and based on the current situation, put forward suggestions on the application of various toxic and harmful (inorganic/organic) gas detectors.
The classification of toxic and harmful gas detectors and the key component of the gas detector is the gas sensor.
Gas sensors can be divided into three major categories according to their principles:
A) Gas sensors utilizing physical and chemical properties: such as semiconductor types (surface control type, volume control type, surface potential type), catalytic combustion type, solid thermal conductivity type, etc.
B) Gas sensors utilizing physical properties: such as thermal conductivity type, optical interference type, infrared absorption type, etc.
C) Gas sensors utilizing electrochemical properties: such as fixed potential electrolysis type, galvanic cell type, diaphragm ion electrode type, fixed electrolyte type, etc.
