Gas detector is an instrument tool for detecting gas leakage concentration, mainly referring to portable devices/Handheld gas detector. Mainly using gas sensors to detect the types of gases present in the environment, gas sensors are sensors used to detect the composition and content of gases. It is generally believed that the definition of gas sensors is based on the classification of detection targets, which means that any sensor used to detect gas composition and concentration is called a gas sensor, regardless of whether it uses physical or chemical methods. For example, sensors that detect gas flow are not considered gas sensors, but thermal conductivity gas analyzers are important gas sensors, although they sometimes use generally consistent detection principles.

Although many standard gas detectors were initially designed to detect only one gas, modern multifunctional or multi gas detection equipment can simultaneously detect multiple gases. Some gas detectors can be used as individual units to monitor small workspaces, or can be combined or connected together to form a monitoring and protection system.

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