Gas detection device and control method

The invention discloses a gas detection device and a control method. A chromatographic analyzer is arranged in a shell, and a gas storage tank capable of automatically exhausting is arranged on the left side of the chromatographic analyzer; an air suction pipe is fixedly connected to the lower end surface of the air storage tank close to the left side; the air inlet end of the air suction pipe is connected with an air suction pump, and the air inlet end of the air suction pump is connected with a collection pipe on the left side of the shell. The right end of the lower end face space of the gas storage tank is fixedly connected with an exhaust pipe, and a second electromagnetic valve is installed on the exhaust pipe. The gas outlet end of the exhaust pipe is connected with the chromatographic analyzer; the air supply pump is connected to the center of the lower end face of the air storage tank; the gas inlet end of the gas supply pump is connected with an inert gas storage tank through a pipeline; a first ele