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介绍一种可同时分析负压样品中常量O2，N2，CO和微量CO2的自制专用气相色谱仪。仪器在负压下取样，经活塞升压后进样。在流程中样品气同时进入并列的色谱柱，再分别检测。常量组分使用热导地（TCD）检测，微量组分使用氦离子化检测器（HelD）检测。CO2的检测灵敏度为10-6（V／V）量级。实验表明，仪器结构简单、操作方便、稳定性好，适合于负压气样的在线分析。负压气样中全组分的分析方法具有推广价值。
A self-made gas chromatograph that can analyze constants O2, N2, CO and trace CO2 in negative pressure samples simultaneously is introduced. Instruments under negative pressure sampling, the pressure after the injection of the piston. In the process of sample gas simultaneously into the side by side column, and then were detected. The constant components were detected using the Thermal Conductivity (TCD) and the trace components were detected using Helium Ionization Detector (HelD). CO2 detection sensitivity of 10-6 (V / V) on the order of magnitude. Experiments show that the instrument has the advantages of simple structure, convenient operation and good stability, and is suitable for on-line analysis of negative pressure gas samples. Negative pressure gas sample analysis of all components with promotional value.