The heat detector is designed to detect ambient temperature, generally it connect with main controller. The main controller checks the current. When ambient temperature reaches preset value or the temperature flare up to rise, the LED indicates alarm, and the current increase. Be suitable for the industrial and civil building where there is explosive and combustible gas. Specification: 1)detecting temperature method: Rate of rise and fixed temperature 2)voltage: 12VDC~30VDC 3)alarm temperature: 65. o C 4)static current: 40μA~80μA 5)working humidity: 10~90% 6)installing method: Ceiling installation 7)The power current should not exceed 30mA 8)After installing and switching on power, the detector is in operation state. When it detects that the ambient temperature is higher than preset alarm value or the temperature flare up to rise, the LED always light