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A thermal conductivity detector

A thermal conductivity detector and heating wire technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of samples that damage chromatographic separation, unavailability of separation and analysis, and achieve the effect of low fluid resistance

Inactive Publication Date: 2016-07-13
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the arrangement, orientation and design of the two measuring resistors prevent flow through the measuring channel and can destroy or damage the chromatographically separated sample, rendering it unusable for further separation and analysis

Method used

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  • A thermal conductivity detector
  • A thermal conductivity detector
  • A thermal conductivity detector

Examples

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Embodiment Construction

[0027] figure 1 A gas chromatograph is shown in which a carrier gas 1 is delivered to an injector 2 which is filled with a sample of a gas mixture 3 to be analyzed and which is then introduced into a separation device 4 such as a single separation column or a complete Separation column system. The separated components or substances of the gas mixture emerging sequentially from the separation device 4 travel to a thermal conductivity detector 5 . There, the separated gas components are conveyed in the measuring channel 6 through an electrothermal heating wire 7 arranged therein. Depending on the thermal conductivity of the respectively flowing gas components compared to the thermal conductivity of the carrier gas, more or less heat is transferred from the heating wire 7 to the channel walls so that the heating wire 7 is cooled or heated accordingly. As a result, the resistance of the heating wire 7 changes, which change is detected in the evaluation device 8 of the detector ...

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Abstract

The invention relates to a thermal conductivity detector (5) comprising: a measurement channel (6), an electrically heatable heating filament (7) extending longitudinally along the center of the measurement channel (6) so that a fluid (23) passing through the measurement channel (6) flows around the filament (7), evaluation means (8) for detecting electrical resistance changes of the heating filament (7) and providing an output (9) representative of the presence and amount of various fluid components passing the heating filament (7), and a bypass channel (13) for bypassing the measurement channel (6), said bypass channel (13) having a lower fluidic resistance than the measurement channel (6). To improve the detection capability, the thermal conductivity detector (5) further comprises: a flow sensor (24) for measuring the flow of the fluid in the bypass channel (13) and providing an output (37) indicative of the measured flow, and correcting means (38) for correcting the output (9) of the evaluation means (8) using the output (37) of the flow sensor (24).

Description

technical field [0001] The invention relates to a thermal conductivity detector, comprising: [0002] - measuring channels, [0003] - a heating wire capable of being electrically heated, extending longitudinally along the center of the measuring channel such that fluid passing through the measuring channel flows around the wire, [0004] - evaluation means for detecting a change in resistance of the heating wire and providing an output indicative of the presence and amount of each fluid component passing through the heating wire, and [0005] - A bypass channel for bypassing the measuring channel, said bypass channel having a lower fluid resistance than the measuring channel. Background technique [0006] Such thermal conductivity detectors are known from US3,768,301A, GB2131180A or EP2431737A1. [0007] Thermal conductivity detectors such as known from US6,896,406B2, WO2009 / 095494A1 or DE102009014618A1 are used to detect a certain liquid or gaseous substance (fluid) bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/66B01L3/00G01N30/62G01N27/18G01F1/708G01F1/7084
CPCB01L3/5027G01F1/7084G01N27/185G01N30/62G01N30/66B01L2300/1827B01L2300/0663G01N2030/025G01N2030/625G01N27/18G01N2030/621
Inventor 乌多·格勒特
Owner SIEMENS AG
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