The basic structure of the gas chromatograph has two parts, namely analysis unit and display unit. The former mainly includes gas source and control metering device, injection device, thermostat and column. The latter mainly include checker and automatic recorder. The column (including the stationary phase) and the detector are the core components of a gas chromatograph.
(1) gas system: gas in the gas chromatographis a continuous operation of the carrier gas pipeline system. The entire gas system requires pure carrier gas, tightness, flow rate and flow rate measurement accuracy.
(2) injection system: injection is the gas or liquid sample is added to the upper end of the column quantitative and uniform.
(3) Separation system: The core of the separation system is a column. Its function is to separate the multi-component sample into individual components. Column is divided into two types of packed column and capillary column.
(4) detection system: The role of the detector is separated from the column components of the sample according to its characteristics and content into electrical signals, amplified, recorded by the recorder into a chromatogram.
(5) signal recording or computer data processing system: In recent years, the main use of gas chromatograph chromatography data processor. Chromatography data processing machine can print the record chromatogram, and can print the same record on a record of the results, such as retention time, the mass fraction of the measured components.
(6) temperature control system: Used to control and measure the column, detector, gasification chamber temperature, gas chromatograph is an important part. Gas chromatographs fall into two categories: one is a gas-solid chromatograph, and the other is a gas-liquid distribution chromatograph. The stationary phases separated by these two types of chromatographs are different, but the structure of the instrument is universal.
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