How to choose a suitable gas detector and what aspects to start with
To ensure the personal safety of factory employees and save costs, the factory can equip employees with multifunctional gas detectors, which can be carried with them for personal gas detection or placed in gas hazardous areas for area detection. Through the built-in sound and light alarm of the gas detector, it automatically alerts and ensures the safety of employees in a timely manner.
The principle and classification of gas detectors
A gas detector is an instrument that can detect the composition and concentration of various gases in the environment. Currently, there are many brands and categories of gas detectors on the market. When choosing a gas detector, companies should compare and choose the one that is suitable for themselves. Gas detectors are mainly divided into portable gas detectors and fixed gas detectors. The core technology of gas detectors is sensor technology, and the classification of gas detectors varies according to the different detection technologies of gas sensors.
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 sensors, made of polymer gas sensing materials, are divided into polymer resistive, polymer dielectric, and concentrated gas sensors, which utilize electrochemical properties.
(4) Polymer gas sensitive materials such as gas difference batteries, surface acoustic waves, quartz oscillators, etc.
