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Helium conservation device for a gas chromatograph

A gas chromatograph, gas source technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of reducing electron ionization sensitivity and low efficiency

Active Publication Date: 2014-12-10
THERMO FINNIGAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a system based on mass spectrometer detection, hydrogen reduces sensitivity to electron ionization (EI) and can lead to dehydrohalogenation reactions in the ion source, while nitrogen leads to charge exchange reactions and is known to be more efficient as a carrier gas. low

Method used

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  • Helium conservation device for a gas chromatograph
  • Helium conservation device for a gas chromatograph
  • Helium conservation device for a gas chromatograph

Examples

Experimental program
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Embodiment Construction

[0021] image 3 One embodiment of the invention is shown. In this embodiment, the lower portion of an SSL injector is designed to allow helium to selectively pass over the end of an analytical column. A gas other than helium is introduced into the injector in a conventional manner to pressurize the inlet and provide a split flow as well as a purge flow of the diaphragm. This novel SSL injector ontology can be used in the system disclosed in FIG. 1 .

[0022] The upper end of a conduit, such as a short section of deactivated, fused silica tubing 38, is positioned within the confines of an injection port liner (not shown). Positioned within this tube 38 is an analytical column 40 . A liner support 42 and base 44 are threaded together at a threaded shank 46 to allow compression of the encapsulated graphite ferrule 48 . This maintains an airtight seal between the fused silica tube 38 and the base 44 . A soft metal gasket 50 is positioned between the base 44 and the terminal en...

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Abstract

A device for conserving helium gas in a gas chromatograph system is characterized in that during the majority of an analytical separation, helium is used as the carrier gas while an auxiliary non-helium gas is used to pressurize the inlet and provide for septum purge and split vent flow. Prior an injection period, a coaxial helium flow is established at the column entrance wherein the coaxial helium flow is less than the column flow. Following the injection and sample transfer period, a coaxial helium flow is established wherein the flow is greater than the column flow.

Description

technical field [0001] The present invention relates to devices for use in gas chromatographs. Background technique [0002] Traditional split / splitless (SSL) or programmed temperature vaporization (PTV) injection ports for gas chromatographs typically consume large volumes of carrier gas as it is used at the split vent and diaphragm wash vent Not for actual analytical separation (column flow). To illustrate, a capillary column flow of about 1 standard cubic centimeter per minute (sccm) has a split flow of 50 sccm or more and a septum purge flow of 5 sccm. A prior art method for reducing this consumption, such as "gas economizers", reduces the fraction after an injection period. However, reducing the shunt to a value that is too low can result in an undesired elevated baseline. This could be caused by a continuous degassing of higher molecular weight contaminants introduced from the sample matrix, degassing of polymeric seals (such as O-rings), injection port septum and / o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/16G01N30/60
CPCG01N2030/127G01N30/16G01N30/10G01N30/7206B01D15/14
Inventor 爱德华·B·麦可利宝洛·马格尼
Owner THERMO FINNIGAN