| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas detection apparatus and a gas detection method which are capable of quickly discriminating natural gas from underground methane.SOLUTION: A search mode for detecting combustible gas in sampled gas, a methane detection mode for, when detecting the combustible gas in the search mode, supplying a predetermined quantity of the sampled gas to a column together with carrier gas and detecting methane from gas passed through the column, and a non-methane detection mode for, after detecting the methane in the methane detection mode, supplying the carrier gas to the column from an opposite direction and detecting gas returned from the column are executed. When detecting the methane in the methane detection mode and detecting the combustible gas other than the methane in the non-methane detection mode, leakage of natural gas is determined. It is possible to quickly discriminate natural gas from underground methane. |
