The sensors and analysers of the atmosphere used in industry can be divided into five types according to the principle of operation. In the list below, they are arranged according to the degree of distribution.
Photoionization sensor of methane gas contamination. They are used to determine organic highly volatile compounds in the air. It is based on the principle of ionization of gases by ultraviolet radiation, during which a weak electric current is created. The amount of current characterizes the degree of gas contamination;
Gas Sensors | What is the Working Principle of Gas Sensors?
A gas detector is a device that detects the presence of gases in an area, often as part of a safety system. This type of equipment is …
Introduction to Gas Sensors
So if I talk about the working principle what happens is if I just zoom it out this gas sensor and say is the sensing material consists ..
Thermochemical gas detector. They have a fairly low threshold of sensitivity and have not found wide application. The principle of their operation is based on the receipt of heat from a chemical reaction, in which the indicator of the device enters when a harmful substance appears in the atmosphere. The resulting heat changes the electrical resistance of the signal circuit;
Optical gas detector. For the wavelength used in the emitter, they are also called infrared. Allow you to determine the presence of complex polyatomic gases in the atmosphere by analyzing the wavelength of the absorbed radiation;
Electrochemical gas pollution sensor. Analyze the conductivity of the chemical solution used in them for direct supplied electric current. Changing the parameters of conductivity, allows you to determine the amount of gas absorbed by the liquid and draw a conclusion about its concentration in the air;
Semiconductor gas pollution sensor. They are used only to determine the concentration of hydrogen sulfide and are based on the semiconductor effect.
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Principle of operation of gas pollution sensors
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