Introduction to Combustible Gas Detector

Combustible gas is a state of combustible substance that can be uniformly mixed with air (or oxygen) within a certain concentration range to form a premixed gas. When it encounters a fire source, it releases a large amount of energy during the combustion process. There are many combustible gases, such as hydrogen (H2), carbon monoxide (CO), methane (CH4), ethane (C2H6), propane (C3H8), butane (C4H10), ethylene (C2H4), propylene (C3H6), butene (C4H8), acetylene (C2H2), propyne (C3H4), butyne (C4H6), hydrogen sulfide (H2S), (PH3), etc.

Explanation of Combustible Gas Detector

Bus and branch lines refer to the connection method between the controller and the detector. If each detector requires a wire to communicate with the controller, this connection method is called a branch line connection. If several detectors can share a single wire to communicate with the controller, this connection method is called bus connection. In a bus system, binary is used for encoding devices on the bus, with 8 being the high bit and 1 being the low bit. When turned to the ON side, it is 0, and when turned to the OFF side, it is 1. The encoding formula is as follows: code number=1 × N1 2 × N2 4 × N3 8 × N4 16 × N5.

Types of combustible gas detectors

Gas detectors are classified according to their detection objects, including combustible gas (including methane) detection alarms, toxic gas detection alarms, and oxygen detection alarms. According to the principle of detection, combustible gas detection includes catalytic combustion type, semiconductor type, thermal conductivity type, and infrared absorption type; Toxic gas detection includes electrochemical and semiconductor types, etc; Oxygen detection has electrochemical types, etc. Classified by usage, there are portable and fixed types. Classified by usage location, there are conventional and explosion-proof types. Classified by function, there are gas detectors, gas alarms, and gas detection alarms. Classified by sampling method, there are diffusion type and pump suction type.