GB1282993A - Gas detecting devices - Google Patents

Gas detecting devices

Info

Publication number
GB1282993A
GB1282993A GB2501370A GB2501370A GB1282993A GB 1282993 A GB1282993 A GB 1282993A GB 2501370 A GB2501370 A GB 2501370A GB 2501370 A GB2501370 A GB 2501370A GB 1282993 A GB1282993 A GB 1282993A
Authority
GB
United Kingdom
Prior art keywords
electrode
conductor
semi
plate
heater
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
GB2501370A
Inventor
Naoyoshi Taguchi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2501370A priority Critical patent/GB1282993A/en
Publication of GB1282993A publication Critical patent/GB1282993A/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
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

1282993 Gas detectors N TAGUCHI 22 May 1970 25013/70 Heading G1N In a device for indicating when the concentration of reducing gas (examples given) or smoke or other suspended particles in air exceeds a limit, the charge in conductivity of a lumped mass of N-type or P-type metal oxide semi-conductor (examples given) upon contact with such gases or particles is utilized to trigger an alarm, a heater being provided to maintain the temperature of the semi-conductor in its most sensitive range. As shown, the lumped mass 56; formed by compression forming, sintering, or brushing with a suspension of powdered semi-conductor material in a suitable medium, is provided on an insulating plate 40 e.g. of ceramic and has electrodes 42, 48, electrode 48 also acting as a heater. In an alternative, Fig. 3 (not shown), the coiled electrode 42 is replaced by an electrode (70) formed by evaporation or baking on the plate 40. The plate 40 may be omitted, Fig.4 (not shown).
GB2501370A 1970-05-22 1970-05-22 Gas detecting devices Expired GB1282993A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2501370A GB1282993A (en) 1970-05-22 1970-05-22 Gas detecting devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2501370A GB1282993A (en) 1970-05-22 1970-05-22 Gas detecting devices

Publications (1)

Publication Number Publication Date
GB1282993A true GB1282993A (en) 1972-07-26

Family

ID=10220812

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2501370A Expired GB1282993A (en) 1970-05-22 1970-05-22 Gas detecting devices

Country Status (1)

Country Link
GB (1) GB1282993A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022366A1 (en) * 1979-07-04 1981-01-14 Matsushita Electric Industrial Co., Ltd. A sensor circuit including a sensing device
GB2137356A (en) * 1983-03-25 1984-10-03 Detection Instr Limited Hydrogen sulphide detector
WO1995008764A1 (en) * 1993-09-23 1995-03-30 The Secretary Of State For Defence Tin oxide based gas sensors and method for their manufacture
US5427740A (en) * 1991-04-05 1995-06-27 British Gas Plc Tin oxide gas sensors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0022366A1 (en) * 1979-07-04 1981-01-14 Matsushita Electric Industrial Co., Ltd. A sensor circuit including a sensing device
GB2137356A (en) * 1983-03-25 1984-10-03 Detection Instr Limited Hydrogen sulphide detector
US5427740A (en) * 1991-04-05 1995-06-27 British Gas Plc Tin oxide gas sensors
WO1995008764A1 (en) * 1993-09-23 1995-03-30 The Secretary Of State For Defence Tin oxide based gas sensors and method for their manufacture
GB2296978A (en) * 1993-09-23 1996-07-17 Secr Defence Tin oxide based gas sensors and method for their manufacture
GB2296978B (en) * 1993-09-23 1997-12-24 Secr Defence Tin oxide based gas sensors and method for their manufacture

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years