HG2100 is a 4-8 channel combustible gas alarm controller. Comprised of a universal metal casing, switch power motherboard, interface board, alarm, and other components (with optional batteries for each). The gas alarm controller (hereinafter referred to as the controller) can form an industrial gas alarm control system with RS485 signal output gas detector. When there is a measured gas or liquid in the air that evaporates, the detector generates a current signal proportional to the concentration of the measured gas in the air. This signal is transmitted to the controller for processing and displays the concentration of the measured gas. When the concentration of the measured gas reaches or exceeds the set value, the controller will emit sound and light alarm signals and output relevant control signals to activate the corresponding control device, thereby avoiding the occurrence of major accidents. This product adopts a modular design and, when used in conjunction with appropriate detectors, can monitor various gases such as combustible gases, toxic gases, and oxygen.