... V1 into quantitative tube 1, after sweeping clean, switch V1 from OFF to ON, carrier gas 1 takes sample into analytical column DC200 ... , before components flowing out, switch valve 1 from OFF to ON, C6+ was flow back to TCD, examined. Components ... , CH4, CO flow into chromatographic column 13X, switch the valve V3 from OFF to ON. Components CO2 and C2 will be detected by ...