Product introduction: bus signal transmission, system anti-interference ability, wiring economy, convenient installation; Users can choose a real-time gas concentration (%LEL/ppm/%VOL) monitoring interface or time display interface according to their needs. Two alarm values and three alarm modes (up/down/poles) can be set at will; Automatic calibration automatic tracking of sensor aging status; Automatic fault monitoring, which can accurately indicate the fault location and type: powerful logic programming ability and arbitrary configuration of the output module can achieve remote automatic control of various kinds of peripherals, 4 programmable emergency buttons can be directly manual. Output control signal: with 999 alarm information 100 fault information and 100 switch information historical data record powerful memory function, information power failure does not lose: RS485 bus communication (standard MODBUS protocol) interface, can achieve communication with the upper control system and fire gas network system networking, improve system integration.