Gas detection method, program, control system, and gas detection system

The purpose of the present invention is to suppress deterioration of a filter unit. The gas detection method comprises a first treatment, a second treatment and a third treatment. In the first to third treatments, the path of the gas is switched between the first to third paths. The first route is a route passing through the first passages (31, 41), the sensor chamber (100), and the second passages (32, 42) in this order. The second route is a route that sequentially passes through the sample gas supply path (R1) that does not pass through the filter unit (20), and the sensor chamber (100), and that causes gas to be discharged from the sensor chamber (100) without passing through the filter unit (20). The third route is a route that sequentially passes through the first passages (31, 41) and the sensor chamber (100) and that causes gas to be discharged from the sensor chamber (100) without passing through the filter unit (20). 本发明的目的是抑制过滤器单元的劣化。该气体检测方法包括第一处理、第二处理和第三处理。在第一处理至第三处理中，在第一路线至第三路线之间切换气体的路线。第一路线是顺次通过