... mouth of valve V1 into quantitative tube 1, after sweeping clean, switch V1 from OFF to ON, carrier gas 1 ... sample into analytical column DC200, before components flowing out, switch valve 1 from OFF to ON, C6+ was ... H2S, C3 and above have not flowed out, switch the valve V2 from OFF to ON. Then H2S ... N2, CH4, CO flow into chromatographic column 13X, switch the valve V3 from OFF to ON. Components CO2 ...