CA2309646A1 - A gas sensor - Google Patents

A gas sensor Download PDF

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Publication number
CA2309646A1
CA2309646A1 CA002309646A CA2309646A CA2309646A1 CA 2309646 A1 CA2309646 A1 CA 2309646A1 CA 002309646 A CA002309646 A CA 002309646A CA 2309646 A CA2309646 A CA 2309646A CA 2309646 A1 CA2309646 A1 CA 2309646A1
Authority
CA
Canada
Prior art keywords
sensor
gas sensor
gas
talk
cheaper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002309646A
Other languages
French (fr)
Other versions
CA2309646C (en
Inventor
John Dodgson
John Edward Andrew Shaw
Malcolm Austen
Monica Backes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric Controls UK Ltd
Original Assignee
Central Research Laboratories Limited
John Dodgson
John Edward Andrew Shaw
Malcolm Austen
Monica Backes
Invensys Energy Management Limited
Invensys Controls Uk Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9723731.7A external-priority patent/GB9723731D0/en
Priority claimed from GBGB9723730.9A external-priority patent/GB9723730D0/en
Priority claimed from GBGB9812667.5A external-priority patent/GB9812667D0/en
Priority claimed from GBGB9812668.3A external-priority patent/GB9812668D0/en
Priority claimed from GBGB9812671.7A external-priority patent/GB9812671D0/en
Application filed by Central Research Laboratories Limited, John Dodgson, John Edward Andrew Shaw, Malcolm Austen, Monica Backes, Invensys Energy Management Limited, Invensys Controls Uk Limited filed Critical Central Research Laboratories Limited
Publication of CA2309646A1 publication Critical patent/CA2309646A1/en
Application granted granted Critical
Publication of CA2309646C publication Critical patent/CA2309646C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors
    • G01N27/4045—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors for gases other than oxygen

Abstract

A gas sensor is described which is particularly well suited as a carbon monoxide (CO) sensor in a self test gas sensor. The sensor includes a number of aspects which may or may not be used in conjunction with one another. A first aspect is an embodiment which reduces electrical interference (or cross-talk) between a test or gas generating cell and a sensing cell. In one embodiment baffles are provided to prevent cross-talk. In another embodiment a switching circuit ensures that a test gas generator is operational only when the gas sensor is disconnected from a current source. A second aspect is an embodiment which includes an improved wick which is in close proximity with an electrode and ensures that the electrolyte is always in contact with the electrode. In an alternate embodiment a solid polymer electrolyte is used between the electrodes. A third aspect is an improved catalyst which reduces the reaction energy and thereby renders the sensor more sensitive. The catalyst is also cheaper than platinum. Overall the gas sensor uses less components than existing gas sensors and is therefore cheaper and easier to assemble and more reliable.
CA002309646A 1997-11-10 1998-11-10 A gas sensor Expired - Fee Related CA2309646C (en)

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
GB9723730.9 1997-11-10
GB9723731.7 1997-11-10
GBGB9723731.7A GB9723731D0 (en) 1997-11-10 1997-11-10 Gas sensors
GBGB9723730.9A GB9723730D0 (en) 1997-11-10 1997-11-10 Gas sensors
GBGB9812667.5A GB9812667D0 (en) 1998-06-11 1998-06-11 A self-test gas sensor
GB9812671.7 1998-06-11
GB9812668.3 1998-06-11
GBGB9812668.3A GB9812668D0 (en) 1998-06-11 1998-06-11 A gas sensor
GBGB9812671.7A GB9812671D0 (en) 1998-06-11 1998-06-11 Method of fabricating an electrode assembly
GB9812667.5 1998-06-11
PCT/GB1998/003363 WO1999024826A1 (en) 1997-11-10 1998-11-10 A gas sensor

Publications (2)

Publication Number Publication Date
CA2309646A1 true CA2309646A1 (en) 1999-05-20
CA2309646C CA2309646C (en) 2004-04-20

Family

ID=27517433

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002309646A Expired - Fee Related CA2309646C (en) 1997-11-10 1998-11-10 A gas sensor

Country Status (6)

Country Link
US (1) US6454923B1 (en)
EP (1) EP1031031B1 (en)
AU (1) AU1044099A (en)
CA (1) CA2309646C (en)
DE (1) DE69841043D1 (en)
WO (1) WO1999024826A1 (en)

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Also Published As

Publication number Publication date
EP1031031A1 (en) 2000-08-30
WO1999024826A1 (en) 1999-05-20
DE69841043D1 (en) 2009-09-17
AU1044099A (en) 1999-05-31
US6454923B1 (en) 2002-09-24
CA2309646C (en) 2004-04-20
EP1031031B1 (en) 2009-08-05

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