... many valves and columns, TCD system analysis H2, O2, CH4, CO, C2H6, CO2, H2S, C2H4, C3H8, C3H6, C4, C5, C6+ and ect ... + was flow back to TCD, examined. Components O2, N2, CH4, CO, CO2 and C2 flow out from DC200 and flow into chromatographic ... valve V2 from ON to OFF. Before CO2 and C2 flowing out, O2, N2, CH4, CO flow into chromatographic column 13X, switch ...