gas chromatographThe detector is a device that converts the concentration or quality (content) of each component separated by a chromatographic column into an easy-to-measure electrical signal (such as voltage, current, etc.) and performs signal processing. It is the eye of a gas chromatograph. It is usually composed of three parts: detection element, amplifier, and digital-to-analog converter. The components separated by the chromatographic column enter the detector in turn, and are converted into corresponding electrical signals according to the change of their concentration or quality with time. After amplification, the chromatogram is recorded and displayed. The performance of the detector will directly affect the accuracy of the analysis results of the gas chromatograph. According to the response principle of the gas chromatograph detector, it can be divided into concentration detector and mass detector.

(1) Concentration detector: It measures the instantaneous change of the component concentration in the carrier gas, that is, the response value of the gas chromatograph detector is proportional to the concentration of the component, such as the thermal conductivity detector and the electron capture detector.

(2) Mass detector: It measures the speed change of the sample carried in the carrier gas entering the detector, that is, the response signal of the gas chromatograph detector is proportional to the mass of the component entering the detector per unit time, such as hydrogen flame ionization detector and flame photometric detector.

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