GB1460746A - Metal oxide gas detectors - Google Patents

Metal oxide gas detectors

Info

Publication number
GB1460746A
GB1460746A GB5856873A GB5856873A GB1460746A GB 1460746 A GB1460746 A GB 1460746A GB 5856873 A GB5856873 A GB 5856873A GB 5856873 A GB5856873 A GB 5856873A GB 1460746 A GB1460746 A GB 1460746A
Authority
GB
United Kingdom
Prior art keywords
sno
doped
composite oxides
coil
alloy
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
GB5856873A
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.)
Maslen C G
Original Assignee
Maslen C G
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 Maslen C G filed Critical Maslen C G
Priority to GB5856873A priority Critical patent/GB1460746A/en
Publication of GB1460746A publication Critical patent/GB1460746A/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
    • 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
    • G01N27/122—Circuits particularly adapted therefor, e.g. linearising circuits

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 Electric Means (AREA)

Abstract

1460746 Semi-conductor gas detector C G MASLEN 11 Feb 1975 [18 Dec 1973] 58568/73 Heading G1N A metal oxide semi-conductor gas detector includes a pair of coaxial wire coils 1, 3 of different radii embedded in the semi-conductor material. The coil 1 is dipped in a slurry of finely divided titanium dioxide, which may be doped with platinum, and binder and heated e.g. by means of the coil to form a layer of metal oxide, the process being repeated until a head 2 is formed. Coil 3 is then wound coaxially as shown and the process repeated until this coil is embedded in semiconductor material 4 which may be different to head 2. The exterior of head 4 may be coated with a refractory layer. The slurry may be a mixture of a fine dispersion of metal having a melting point above 500‹C in either a metal oxide or another refractory material. Semi-conductor materials:- (a) titanium based composite oxides such as TiO 2 , SnO 2 which may be additionally doped with Ru, Pt, Pd, Ir or Rh; (b) tin based composite oxides such as SnO 2 , Al 2 O 3 ; (c) tungsten trioxide doped with Pt, Ir, Ru, Rh or Pd (detecting H 2 ); (d) tin and zinc composite oxides such as ZnO, SnO 2 doped with Pt and Pd; (a) zirconium based composite oxides such as ZrO 2 , yttrium oxide and samarium oxide doped with Pt or Pd; (f) hafrium and tin composite oxides such as HfO 2 , SnO 2 ; (g) zinc, tin and hafrium composite oxides such as SnO 2 , ZnO, HfO 2 coated with layers of Al 2 O 3 , ThO 2 doped with Pt and Co; (h) uranium based composite oxides such as UO 2 , Al 2 O 3 doped with palladium. The materials should preferably exhibit a variation in the slope of their resistivitytemperature characteristics e.g. change of slope, a plateau or a positive temperature coefficient of resistivity region bounded by negative coefficients of resistivity. This may be achieved by the addition of Pt per SnO 2 and ZnO or by forming composite materials (f). Addition of antimony oxide in SnO may also be used. Coil materials Pt; Rh-Pt alloy; Ir-Rh-Pt alloy; Ir-Pt alloy; Ir-Pd alloy; Pd; Ni; Ni-Cr alloy. Operation The detetors are mounted between three or more contacts and connected in the circuit of Fig. 4 wherein a D.C. heating current is supplied to the outer coil to heat it and the conductance between the two coils is measured which can operate an alarm, e.g. L.E.D. or a meter, or used in a servocontrol system.
GB5856873A 1973-12-18 1973-12-18 Metal oxide gas detectors Expired GB1460746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5856873A GB1460746A (en) 1973-12-18 1973-12-18 Metal oxide gas detectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5856873A GB1460746A (en) 1973-12-18 1973-12-18 Metal oxide gas detectors

Publications (1)

Publication Number Publication Date
GB1460746A true GB1460746A (en) 1977-01-06

Family

ID=10481924

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5856873A Expired GB1460746A (en) 1973-12-18 1973-12-18 Metal oxide gas detectors

Country Status (1)

Country Link
GB (1) GB1460746A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014087A1 (en) * 1979-01-22 1980-08-06 Ford Motor Company Limited Exhaust gas sensor
EP0095844A2 (en) * 1982-05-27 1983-12-07 Honeywell Inc. Gas sensor
GB2125218A (en) * 1982-08-05 1984-02-29 Bacharach Instr Co Catalytic gas sensor reference element
GB2137356A (en) * 1983-03-25 1984-10-03 Detection Instr Limited Hydrogen sulphide detector
GB2148514A (en) * 1983-10-08 1985-05-30 Plessey Co Plc Device for measuring the liquid content of a gas
GB2165054A (en) * 1984-09-26 1986-04-03 Atomic Energy Authority Uk Gas sensors
WO1986002731A1 (en) * 1984-10-29 1986-05-09 Commonwealth Scientific And Industrial Research Or Sensors and method for the measurement of oxygen partial pressures in hot gases
FR2583877A1 (en) * 1985-06-21 1986-12-26 Tours Universite OXYGEN PROBE WITH RESISTANCE OF CERIUM OXIDE COMPENSATED
US4720993A (en) * 1984-10-29 1988-01-26 Commonwealth Scientific & Industrial Research Organization Semiconducting oxygen sensors
GB2248306A (en) * 1990-08-06 1992-04-01 Capteur Sensors & Analysers Gas sensing resistance transducer element

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014087A1 (en) * 1979-01-22 1980-08-06 Ford Motor Company Limited Exhaust gas sensor
EP0095844A2 (en) * 1982-05-27 1983-12-07 Honeywell Inc. Gas sensor
EP0095844A3 (en) * 1982-05-27 1984-09-19 Honeywell Inc. Gas sensor
GB2125218A (en) * 1982-08-05 1984-02-29 Bacharach Instr Co Catalytic gas sensor reference element
GB2137356A (en) * 1983-03-25 1984-10-03 Detection Instr Limited Hydrogen sulphide detector
US4890494A (en) * 1983-10-08 1990-01-02 Plessey Overseas Limited Atmospheric sensor
GB2148514A (en) * 1983-10-08 1985-05-30 Plessey Co Plc Device for measuring the liquid content of a gas
GB2165054A (en) * 1984-09-26 1986-04-03 Atomic Energy Authority Uk Gas sensors
US4720993A (en) * 1984-10-29 1988-01-26 Commonwealth Scientific & Industrial Research Organization Semiconducting oxygen sensors
WO1986002731A1 (en) * 1984-10-29 1986-05-09 Commonwealth Scientific And Industrial Research Or Sensors and method for the measurement of oxygen partial pressures in hot gases
FR2583877A1 (en) * 1985-06-21 1986-12-26 Tours Universite OXYGEN PROBE WITH RESISTANCE OF CERIUM OXIDE COMPENSATED
EP0208591A1 (en) * 1985-06-21 1987-01-14 Universite De Tours Oxygen sensor with a compensated resistive element made of cerium oxide
GB2248306A (en) * 1990-08-06 1992-04-01 Capteur Sensors & Analysers Gas sensing resistance transducer element
GB2248306B (en) * 1990-08-06 1995-04-05 Capteur Sensors & Analysers Transducer elements

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PE20 Patent expired after termination of 20 years

Effective date: 19950210