The double gas alarm controller is a smart controlled system that is practical and easy operated. It can be connected to the gas sensor that with 4-20mA signal output, to realize remote control and system integration. It is compatible to different kinds of gas sensors, mainly use for areas that need to measure combustible or toxic gases, which can show the gas concentration directly, and when the gas concentration reaches to the alarm point, the controller will alarm with sound and light. The controller is also with relay output, which can control the exhaust fan and other devices, to realize intelligent and automatic operation.