Flow regulator device for analyzing loop and its application in chromatography

A technology of flow regulator and pressure regulator, which is applied in flow control of electric devices, analysis materials, control/regulation system, etc., and can solve problems such as air flow sensitivity, gas characteristic sensitivity, and the regulator cannot be used for analysis circuits, etc.

Inactive Publication Date: 2005-05-25
DANI INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of this flow regulator is that it is sensitive to gas properties in addition to gas flow; as a result, changes in filament temperature not only indicate changes in the flow rate of the analyte gas, but can also depend on changes in gas composition; as a result, This type of regulator cannot be used in an analytical circuit whose function is precisely to determine the gas composition

Method used

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  • Flow regulator device for analyzing loop and its application in chromatography
  • Flow regulator device for analyzing loop and its application in chromatography
  • Flow regulator device for analyzing loop and its application in chromatography

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Embodiment Construction

[0016] As seen in the figure, the flow regulator device of the present invention comprises a fluid restrictor R of constant characteristic, which can consist, for example, of a pipe of length L and diameter D, exhibiting at its inlet end a pressure Pi, at its The outlet port exhibits a pressure Pu≤Pi.

[0017] From the Poisuille equation, it can be known that the gas flow F flowing through the restrictor R at a very low linear velocity and passing through the two ends of the pressure difference AP = Pi-Pu is given by the following formula:

[0018] F=k(Pi 2 -Pu 2 ) / Pu

[0019] where k=k'D 4 / ηL

[0020] Here k' is a constant of proportionality, D is the pipe diameter, L is its length, and η is the gas viscosity.

[0021] The flow regulator of the invention utilizes two regulators 2 and 4 at the ends of the restrictor R for regulating the pressures Pi and Pu at the respective ends.

[0022] More specifically, with reference to the flow direction F, the upstream regulator ...

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Abstract

A flow regulator device for an analytical circuit, characterised by comprising: a fluid restriction of defined characteristics related to the field of application of the analytical circuit, a direct-pressure regulator positioned upstream of said restriction, a back pressure regulator positioned downstream of said restriction.

Description

technical field [0001] The present invention relates to flow regulator devices for analytical circuits and their use in chromatography. Background technique [0002] In technical chromatography, it is often necessary to control the flow through an analytical circuit both in the sense of keeping the flow constant and varying it in the desired manner for the purpose of the analysis. [0003] The need to keep the flow constant during chromatography is related to the fact that the hydraulic column load varies with temperature during the analysis; while the need to vary the flow in the desired manner is related to handling the sample differently related to this need. [0004] To control the flow through a column of an analytical loop, a pressure regulator is currently used in series with the column. A control program is provided for this purpose, which varies the gas pressure to compensate for changes in column load due to changes in temperature etc., which in turn are associat...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N30/02G01N30/32G01N30/34G01N30/46G05D7/06G05D16/06
CPCG01N30/32G01N30/34G01N30/466G01N2030/025G01N2030/324G05D16/0402Y10T137/0379Y10T137/2531
Inventor斯特凡诺·布尔西耶纽塔米歇尔·金泰尔
OwnerDANI INSTR