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Automatic regulating device for flow pressure of gas chromatograph

A gas chromatograph, automatic adjustment technology, applied in the field of analytical instruments, can solve the problem that the flow rate of the gas chromatograph cannot be automatically controlled, and achieve the effect of low cost and reduced requirements

Inactive Publication Date: 2010-07-07
上海仪电分析仪器有限公司
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a gas chromatograph flow pressure automatic adjustment device to solve the problem that the current gas chromatograph flow cannot be automatically controlled

Method used

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  • Automatic regulating device for flow pressure of gas chromatograph

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Embodiment Construction

[0008] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.

[0009] In order to realize the technical problem of automatic control and display of three-way flow and pre-column pressure in a gas chromatograph (FID), an automatic flow pressure adjustment device is provided according to the following technical scheme. The regulating device includes a pressure stabilizing valve, a needle valve, a proportional valve, a flow sensor, a pressure sensor, and a detection control circuit. The circuit includes a single-chip CPU, an analog-to-digital conversion chip A / D, a digital-to-analog conversion chip D / A, a driver chip DR, a communication interface, and a power supply; wherein the single-chip microcomputer accepts the flow (pressure) setting value through the communication interface, and the single-chip microcomputer passes through according to the set value. Analog-to-digital conversion chip, dri...

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Abstract

The invention discloses an automatic regulating device for flow pressure of a gas chromatograph, which comprises at least one pressure stabilization valve and at least one needle valve. The automatic regulating device also comprises at least one proportional valve, at least one flow sensor and a detection control circuit. The pressure stabilization valve is connected with the needle valve and the proportional valve. An air source of the gas chromatograph passes through the pressure stabilization valve, the needle valve and the proportional valve, is detected by the flow sensor and then enters a detector. The detection control circuit regulates the proportional valve to control the flow according to the data and the preset value provided by the flow sensor. The automatic regulating device for the flow pressure is adopted to substitute for a mechanical regulating valve and a mechanical pressure gage, achieves the flow control precision of the mechanical valve, and meets the basic requirement on automatic operation of the gas chromatograph.

Description

technical field [0001] The invention relates to the technical field of analytical instruments, in particular to an automatic adjustment device for the flow pressure of a gas chromatograph. Background technique [0002] In gas chromatography, hydrogen flame ionization detector (FID) is widely used in the detection of organic compounds. The FID gas chromatograph requires the coordination of the flow rates of carrier gas (nitrogen), combustion gas (hydrogen) and assisted gas (air), and displays the pressure in front of the carrier gas (nitrogen) chromatographic column. At present, the flow rate of most gas chromatographs in China is adjusted by mechanical valves, and mechanical gauges are used for pressure display, which cannot meet the requirements of instrument automation. In order to meet the requirements of instrument automation, electronic flow (pressure) control modules must be used to replace mechanical regulating valves and mechanical pressure gauges. Contents of the...

Claims

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Application Information

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IPC IPC(8): G01N30/32
Inventor 戴星明何国琛
Owner 上海仪电分析仪器有限公司
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