Nanxiye Machinery Manufacturing Co., Ltd. is a heavy mining machinery enterprise integrating machining, casting, forging and riveting, electrical facilities and maintenance business. In the process of mechanical processing, flammable and harmful gases are produced, including carbon monoxide, carbon dioxide, sulfur dioxide, nitrogen, hydrogen sulfide, hydrogen, methane and other gases. The project uses the ASD5300C, ASD5300 detector and JB-TB-ASD5100 alarm controller.