Main features, can meet the 1~4 point standard 4~20mA current signal detector access; Compact and convenient, easy to wall mount. Can realize more than 2 sets of side-by-side combined installation, to meet the needs of customers more points (through the basic no-gap combination to achieve 8 points, 12 points 16 points and even more wall hanging needs); Real-time concentration of combustible gas, toxic gas, oxygen (%LEL, 10 ", %VOL) and switching quantity signal monitoring, display function (default setting is combustible gas detection. Detector, no need to set, after installation can be used with power); Each channel is linked to a switching output by default, and the linkage programming can be set through the menu when necessary. Each set has one RS485 digital interface to realize communication with the host computer; Industrial high brightness LED concentration polling display, longer viewing distance, and wider viewing Angle. The concentration is 4 significant digits, providing an accuracy display of 9999~0.001:999 alarms and 999 fault records can be saved respectively.