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Gas sensor and its method of manufacture

A technology of gas sensor and manufacturing method, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as electrolyte leakage

Inactive Publication Date: 2006-04-12
CENTRO RESEARCH LABORATORIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No matter how carefully the area around each hole and between the electrodes is sealed, there is a risk of electrolyte leaking through the seal

Method used

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  • Gas sensor and its method of manufacture
  • Gas sensor and its method of manufacture
  • Gas sensor and its method of manufacture

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example

[0048] Example: For a PTFE sheet, such as Mupor (registered trademark) type 131 (MUPOR LTD., Alness, UK), thickness 0.2 mm, average pore size 2 μm, impregnation material polypropylene (material from Whitaker Technical Plastics Ltd., Macclesfield, UK) Loaded with 40wt% carbon black particles with an average agglomerate size rating of 200μm, approximately 200N / cm at 200-240°C 2 The pressure was kept under 10 s, and good conductivity through the film was obtained using hot pressing technique. This creates a low resistance junction through the membrane to the Pt / PTFE gas diffusion electrode, which is porous with an average pore size equal to that of the membrane and mounted on the opposite side of the membrane. In the gas sensor shown in the embodiment, such an electrode and contact can be used to detect carbon monoxide.

[0049] image 3 Shown is a gas sensor 100 comprising a housing 102 containing a container 104 of liquid electrolyte. The upper end of the container 104 has a...

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Abstract

The invention relates to a gas sensor and its method of manufacture. Electrochemical gas sensors usually comprise an external housing, which acts as a reservoir for electrolyte; a wick to keep electrodes wetted with the electrolyte and external electrical terminals, for making electrical contact with the electrodes. Typically a gas permeable / microporous membrane has been used to seal a gas sensor in order to prevent leakage of electrolyte. A problem with existing sensors has been that there was a risk of electrolyte leaking through the membrane around the region where electrical connector passed therethrough. The present invention overcomes this by providing a method of urging conductive polymer through the membrane under controlled conditions of heat and pressure, thereby ensuring the integrity of the membrane remains intact whilst defining an electrically / conductive pathway therethrough.

Description

technical field [0001] The present invention relates to a gas sensor and a manufacturing method thereof. The present invention particularly relates to electrochemical sensors for the detection of carbon monoxide (CO) gas, but is not limited to such sensors. Background technique [0002] Electrochemical gas sensors that detect oxidizing or reducing gases such as carbon monoxide typically include a detection electrode, a counter electrode, and a diffusion membrane. The diffusion membrane allows the analyte gas to flow to the detection electrode. In one type of gas sensor, such as that described in the applicant's co-pending international application WO-A1-9614576, the detection electrode and counter electrode are located on a gas permeable membrane in contact with the electrolyte. [0003] Depending on the physical structure, electrochemical gas sensors typically include a housing that acts as a container for the electrolyte; a core that holds the electrolyte in contact with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/49G01N27/404G01N27/416
CPCG01N27/404G01N27/49
Inventor 约翰·R·道奇森马尔科姆·T·奥斯汀
Owner CENTRO RESEARCH LABORATORIES INC
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