The gas detector is a special instrument for monitoring the concentration value of gas leakage, including portable gas detector, hand-held gas detector, fixed gas detector, online gas detector, etc. The gas sensor is mainly used to monitor the type of gas in the regional environment. The gas sensor is used to monitor the composition and content of gas.

Classification by usage
1. Portable harmful gas detector
The instrument integrates the sensor, measuring circuit, display, alarm, rechargeable battery, suction pump, etc. into a shell to generate an integrated instrument with small volume, light weight, easy to carry, sampling by suction, and monitoring anytime and anywhere. The pocket instrument is a portable instrument. Generally, there is no pump for diffusion sampling. It is powered by dry battery and the equipment is small.
2. Fixed harmful gas detector
This instrument is fixed on the site and can continuously and automatically detect corresponding harmful gases. If the harmful gas exceeds the limit, the system will automatically alarm. Some can also control the exhaust fan automatically. Fixed instruments and equipment can be divided into integral type and split type.
Split-type fixed hazardous gas detector: sensor and signal transmission line are installed in the enclosure of explosion-proof equipment, commonly known as probe, and installed on site (dangerous place); The second part mainly includes data analysis, secondary information display, alarm control and power supply. It is installed as a controller, usually called auxiliary instrument and equipment, and installed in the control room (safe place).
Probe diffusion sampling monitoring, secondary instrument information display alarm.
Integrated fixed harmful gas detector: in addition to on-site installation, like portable instruments and equipment, 220 V AC power supply, continuous automatic detection and alarm, most of which are diffusion sampling.