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Assembly for controlled feeding and delivery of gas mixture into an analysis chamber

A technology of gas mixture and analysis chamber, which is applied in the direction of analyzing, measuring devices, and analyzing materials through chemical reactions of materials, and can solve problems such as inability to ensure measurement accuracy and inability to completely suppress quenching effects

Active Publication Date: 2012-05-30
AVL EMISSION TEST SYST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the disadvantage of both embodiments is that the quenching effect cannot be completely suppressed by dilution and the accuracy of the measurement cannot be ensured

Method used

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  • Assembly for controlled feeding and delivery of gas mixture into an analysis chamber
  • Assembly for controlled feeding and delivery of gas mixture into an analysis chamber

Examples

Experimental program
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Embodiment Construction

[0017] The figure shows a dosing device which has a dosing line 2 into which a gas mixture can flow via an inlet 4 . A flow limiter 6 is arranged in the metering line 2 for the defined regulation of the delivery volume flow and the outlet pressure depending on the constant inlet pressure and the composition of the gas mixture.

[0018] A branch 8 is located downstream of the flow restrictor 6, at which a bypass 10 branches off from the dosing conduit 2, so that the mixed gas flow is integrated into two subflows according to its viscosity, density and the cross-section of the conduits 2, 10 available.

[0019] Downstream of the branch 8, a first capillary 12 is arranged in the dosing conduit 2, through which a partial flow of the gas mixture from the dosing conduit flows into the analysis chamber 14, which in the present embodiment is designed as The reaction chamber of the chemiluminescence analysis device.

[0020] From there the subflow flows into the discharge conduit 16 ,...

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Abstract

Quench gases that are present when measuring nitrogen oxides by chemiluminescence lead to a distortion of the measurement results. Therefore, an assembly for the controlled feeding and delivery of a gas mixture into an analysis chamber (14) is proposed, comprising at least one metering line (2), a first capillary (12) arranged in the at least one metering line (2), an analysis chamber (14) into which the gas mixture flows from the metering line (2), and an outlet line (16). The metering assembly comprises a flow limiter (6), downstream of which the first capillary is arranged in the measuring line (2), wherein a bypass line (10), in which a nozzle (22) is arranged and which opens into the outlet line (16) downstream of the analysis chamber (14), branching off the metering line (2) between the flow limiter (6) and the first capillary (12). With such an embodiment, the distortion of the measurement results due to the quench effect is compensated by the assembly, which results in an increase of the flow through the reaction chamber.

Description

technical field [0001] The invention relates to a device for the controlled supply and delivery of a gas mixture into an analysis chamber, the device having at least one dosing conduit, a first capillary, an analysis chamber and an outlet conduit, wherein the first capillary is arranged in In the dosing conduit, the gas mixture flows from the dosing conduit into the analysis chamber. Background technique [0002] Such devices are known, for example, from the field of gas chromatography or chemiluminescence analysis. [0003] The measuring principle of chemiluminescent analysis is based on the spontaneous reaction of nitric oxide with ozone. Nitric oxide and ozone are converted into nitrogen dioxide and oxygen, wherein a part of the formed nitrogen dioxide molecules are in an excited state after the reaction. Upon transition to the ground state, excess energy is emitted in the form of optically measurable radiation, the intensity of which is directly proportional to the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N1/38
CPCG01N21/76G01N35/00G01N2021/6432
Inventor N.克雷夫特
Owner AVL EMISSION TEST SYST GMBH