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GB1447488A - Gas detectors - Google Patents

Gas detectors

Info

Publication number
GB1447488A
GB1447488A GB3894672A GB3894672A GB1447488A GB 1447488 A GB1447488 A GB 1447488A GB 3894672 A GB3894672 A GB 3894672A GB 3894672 A GB3894672 A GB 3894672A GB 1447488 A GB1447488 A GB 1447488A
Authority
GB
United Kingdom
Prior art keywords
gas detectors
detectors
gas
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.)
Expired
Application number
GB3894672A
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.)
British Gas Corp
Original Assignee
British Gas Corp
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
Application filed by British Gas Corp filed Critical British Gas Corp
Priority to GB3894672A priority Critical patent/GB1447488A/en
Publication of GB1447488A publication Critical patent/GB1447488A/en
Expired 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
    • 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
    • G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
    • G01N33/0032—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array using two or more different physical functioning modes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
GB3894672A 1972-08-21 1972-08-21 Gas detectors Expired GB1447488A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3894672A GB1447488A (en) 1972-08-21 1972-08-21 Gas detectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3894672A GB1447488A (en) 1972-08-21 1972-08-21 Gas detectors

Publications (1)

Publication Number Publication Date
GB1447488A true GB1447488A (en) 1976-08-25

Family

ID=10406671

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3894672A Expired GB1447488A (en) 1972-08-21 1972-08-21 Gas detectors

Country Status (1)

Country Link
GB (1) GB1447488A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173886A (en) * 1978-06-27 1979-11-13 British Gas Corporation Gas detectors
DE3329432A1 (en) * 1983-08-12 1985-02-28 Auergesellschaft Gmbh, 1000 Berlin GAS DETECTOR
EP0231073A2 (en) * 1986-01-15 1987-08-05 Gas Measurement Instruments Ltd. Apparatus for detecting gaseous hydrocarbons
EP0440906A1 (en) * 1990-02-03 1991-08-14 Auergesellschaft Gmbh Circuit arrangement for a gas sensor
WO1993007477A1 (en) * 1991-09-30 1993-04-15 Siemens Aktiengesellschaft Exhaust gas sensor using planar technology to regulate motor vehicle engines
US6431016B1 (en) * 1997-07-05 2002-08-13 Osmetech Plc Apparatus and methods for gas sampling

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173886A (en) * 1978-06-27 1979-11-13 British Gas Corporation Gas detectors
DE3329432A1 (en) * 1983-08-12 1985-02-28 Auergesellschaft Gmbh, 1000 Berlin GAS DETECTOR
EP0231073A2 (en) * 1986-01-15 1987-08-05 Gas Measurement Instruments Ltd. Apparatus for detecting gaseous hydrocarbons
EP0231073A3 (en) * 1986-01-15 1989-08-30 Gas Measurement Instruments Ltd. Apparatus for detecting gaseous hydrocarbons
EP0440906A1 (en) * 1990-02-03 1991-08-14 Auergesellschaft Gmbh Circuit arrangement for a gas sensor
WO1993007477A1 (en) * 1991-09-30 1993-04-15 Siemens Aktiengesellschaft Exhaust gas sensor using planar technology to regulate motor vehicle engines
US6431016B1 (en) * 1997-07-05 2002-08-13 Osmetech Plc Apparatus and methods for gas sampling

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Legal Events

Date Code Title Description
414F Notice of opposition given (sect. 14/1949)
414A Case decided by the comptroller ** specification amended (sect. 14/1949)
SPA Amended specification published
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19931120