Product introduction: bus signal transmission, system anti-interference ability, wiring economy, convenient installation; Switching real-time concentration display or time display for monitoring combustible gases and vapors; 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, can accurately indicate the fault location and type; The powerful logic programming ability and the arbitrary configuration of the output module can realize the remote automatic control of various kinds of peripherals, and the four programmable emergency buttons can directly output the control signal manually; It has a powerful memory function of 999 alarm information, 100 fault information and 100 switch information historical data record, and does not lose RS485 bus communication (standard MODBUS protocol) interface when the information is powered off. It can realize communication with the upper control system and the fire gas network system networking, and improve the system integration.