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GB2015175A - Detector for Combustible Gases - Google Patents

Detector for Combustible Gases

Info

Publication number
GB2015175A
GB2015175A GB7906419A GB7906419A GB2015175A GB 2015175 A GB2015175 A GB 2015175A GB 7906419 A GB7906419 A GB 7906419A GB 7906419 A GB7906419 A GB 7906419A GB 2015175 A GB2015175 A GB 2015175A
Authority
GB
United Kingdom
Prior art keywords
detector
combustible gases
quasibridge
impedance
deposit
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
GB7906419A
Other versions
GB2015175B (en
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.)
Johnson Matthey PLC
Original Assignee
Johnson Matthey PLC
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 Johnson Matthey PLC filed Critical Johnson Matthey PLC
Priority to GB7906419A priority Critical patent/GB2015175B/en
Publication of GB2015175A publication Critical patent/GB2015175A/en
Application granted granted Critical
Publication of GB2015175B publication Critical patent/GB2015175B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • 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
    • G01N27/16—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 burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire

Landscapes

  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Immunology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Electrochemistry (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

A detector for combustible gases comprising a quasibridge circuit including first and second resistant thermometer elements one of which has a layer or deposit of a catalytic material connected to a negative feedback amplifier such that the impedance between the amplifier output and earth is substantially zero. <IMAGE>
GB7906419A 1977-11-24 1979-02-23 Detector for combustible gases Expired GB2015175B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7906419A GB2015175B (en) 1977-11-24 1979-02-23 Detector for combustible gases

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4901477 1977-11-24
GB7906419A GB2015175B (en) 1977-11-24 1979-02-23 Detector for combustible gases

Publications (2)

Publication Number Publication Date
GB2015175A true GB2015175A (en) 1979-09-05
GB2015175B GB2015175B (en) 1982-08-04

Family

ID=26266378

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7906419A Expired GB2015175B (en) 1977-11-24 1979-02-23 Detector for combustible gases

Country Status (1)

Country Link
GB (1) GB2015175B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068178A1 (en) * 1981-06-11 1983-01-05 Nissan Motor Co., Ltd. Temperature control system
GB2198845A (en) * 1986-07-17 1988-06-22 Atomic Energy Authority Uk Sensing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068178A1 (en) * 1981-06-11 1983-01-05 Nissan Motor Co., Ltd. Temperature control system
US4471648A (en) * 1981-06-11 1984-09-18 Nissan Motor Company Temperature control system
GB2198845A (en) * 1986-07-17 1988-06-22 Atomic Energy Authority Uk Sensing

Also Published As

Publication number Publication date
GB2015175B (en) 1982-08-04

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee