Four-gas detection device based on wireless fidelity

The utility model discloses a four-gas detection device based on wireless fidelity, which is characterized in that the four-gas detection device comprises a controller, a radio transmission unit, a serial port unit, a digital display unit, a power supply unit, a gas sensor unit and a concentration limit alarm unit, wherein the gas sensor unit consists of a carbon monioxide sensor, a hydrogen sulfide sensor, a methane sensor, an oxygen sensor, a first conditioning circuit, a second conditioning circuit, a third conditioning circuit, a fourth conditioning circuit and a time division multiplex one-out-of-four electric analog switch. Besides, a rechargeable battery pack is arranged in the four-gas detection device, the four-gas detection device can be carried by an operator or hung on a working area, and four gas concentrations acquired in environments can be displayed digitally by means of triggering of local keys and can be transmitted to a dispatching room wirelessly, thereby increasing response speed of mines