Flow distribution/non-flow distribution sample inlet carrier gas control system of capillary gas chromatograph instrument

Abstract

The invention discloses a flow distribution/non-flow distribution sample inlet carrier gas control system of a capillary gas chromatograph instrument. The system comprises a system control unit in which parts such as an analog-digital converter, a digital-analog converter, a single chip and an output serial port are arranged, a sample inlet pressure controller connected with the analog-digital converter and the digital-analog converter, a spacing cushion purge flow controller connected with the output serial port, a flow distribution/non-flow distribution sample inlet with one end connected with the sample inlet pressure controller and the other end connected with the spacing cushion purge flow controller, and a chromatographic column connected with the flow distribution/non-flow distribution sample inlet. The system is simple and easy to understand in overall structure, clear in construction, good in anti-jamming capability and easy to maintain; the problems of jamming resistance, high debugging difficulty and the like in the design of a discrete device and a large amount of manpower and material resources in calibration and the like of a sensor part in a production process are avoided.

Description

technical field [0001] The invention relates to the field of chromatograph equipment, in particular to a carrier gas control system for a sample inlet of a capillary gas chromatograph. Background technique [0002] Gas chromatography (GC) is an experimental technique that separates mixtures into individual components and is used to identify and quantify sample components. Unlike physical separations such as distillation and similar techniques, gas chromatography (GC) is a separation technique based on time differences. Vaporized mixtures or gases are passed through tubes containing certain substances based on the retention properties of the substances in the tubes for different compounds. That is, the compounds are separated based on time differences. After the sample passes through the detector, the chromatogram is recorded, and each peak represents a different component in the original mixed sample. A gas chromatography system consists of: a controllable and pure carrier ...

AI Technical Summary

Problems solved by technology

The manual adjustment method of the mechanical valve has lagged behind in some aspects, while the automatic control method of the electronic valve is commonly used in high-end gas chromatography, and the implementation methods are also diversified. The control method is designed with discrete electronic components, and the discrete electronic components are independently designed. The disadvantage is that the reliability is not high, the maintenance is complicated, and the control system design and manufacture are complicated

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