What are the functions of gas detectors in different environments?
Gas sensors can be classified into four major categories based on their principles:
1) Electrical gas sensors, which use the electrical parameters of materials to change with gas concentration, are divided into resistive and non resistive types. Resistive gas sensors mainly include contact combustion, thermal conductivity, semiconductor gas sensors (also known as metal oxide semiconductor gas sensors and organic semiconductor gas sensors), etc. Non resistive gas sensors usually use the current or voltage of materials to change with gas content.
2) Optical gas sensors use the optical properties of gases to detect gas composition and concentration, which can be divided into infrared absorption, visible light absorption photometry, optical interference, chemiluminescence, test paper photoelectric photometry, photoionization, etc.
3) Electrochemical gas sensors utilize electrochemical properties.
4) Polymer gas sensors, made of polymer gas sensing materials, are divided into polymer resistance type, polymer dielectric type, concentration cell type, surface acoustic wave type, quartz oscillator type, etc.
Commonly used gas detectors
Multi functional gas detector is a type of gas detector widely used due to its ability to simultaneously detect multiple gases. As the name suggests, a multifunctional gas detector is an instrument used to detect the content of one or more gases in the environment. The detector uses natural diffusion to detect gases and employs electrochemical and combustion gas sensors, which have excellent sensitivity and repeatability. The multifunctional gas detector can detect four gases: oxygen, combustible gas, carbon monoxide, and hydrogen sulfide, and can store up to 130000 detection data. With the help of software, historical data can be viewed at any time.
