Gas detection device with self protection functionality

A gas detection device, including:

• a first inlet channel, configured to input a sample gas;
• a second inlet channel, configured to input a purge gas;
• a detection module, configured to obtain at least one detected concentration value of at least one detection target from the sample gas;
• a switch valve, connected respectively with the first inlet channel, the second inlet channel and the detection module, being switchable between a sampling position and a purging position to communicate the detection module with one of the first inlet channel and the second inlet channel;
• and
• a control module, communicative respectively with the detection module and the switch valve, including a processing unit and a setting unit, the setting unit configured to set at least one setting concentration value, the processing unit controlling the switch valve according to the at least one detected concentration value and the at least one setting concentration value;
• wherein the gas detection device further includes a rack, the rack includes a frame and a plurality of boards assembled to the frame, the frame and the plurality of boards define a receiving space therebetween, and the detection module, the switch valve and the control module are received within the receiving space.