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JPS57198854A - Identifying and detecting device for gas - Google Patents

Identifying and detecting device for gas

Info

Publication number
JPS57198854A
JPS57198854A JP8377681A JP8377681A JPS57198854A JP S57198854 A JPS57198854 A JP S57198854A JP 8377681 A JP8377681 A JP 8377681A JP 8377681 A JP8377681 A JP 8377681A JP S57198854 A JPS57198854 A JP S57198854A
Authority
JP
Japan
Prior art keywords
circuit
gas
voltage
attenuating
signal
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.)
Pending
Application number
JP8377681A
Other languages
Japanese (ja)
Inventor
Kiyoshi Nakajima
Haruichi Otani
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.)
Riken Keiki KK
Original Assignee
Riken Keiki KK
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 Riken Keiki KK filed Critical Riken Keiki KK
Priority to JP8377681A priority Critical patent/JPS57198854A/en
Publication of JPS57198854A publication Critical patent/JPS57198854A/en
Pending 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
    • 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 Fluid Adsorption Or Reactions (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

PURPOSE:To enable city gas which consists of mainly LNG, LPG and hydrogen to be clearly identified and detected even if they are in a low concentration, by adapting the fact that an output property to various kinds of gases differs with an element temperature of a gas detecting element which consists of mainly a metalic oxide semiconductor. CONSTITUTION:Gas to be measured is brought into contact with a detecting element of a gas detecting mechanism 1 through installation of a suction pump 5 for gas to be measured, and with the heater of the mechanism 1 actuated, a gas detecting element 2 is brought to a given temperature. According to an instruction from a process control circuit 7, a comparision circuit 10 compares a signal voltage from a hold circuit 8 for storing the output signal voltage from the mechanism 1 with a reference voltage to discriminate the pressure of gas. A comparision circuit 12 compares a voltage from an attenuating circuit 11 for attenuating the signal voltage from the circuit 8 with the voltage signal from the mechanism 1, and a comparision circuit 14 compares a voltage from an attenuating circuit 13 for attenuating the signal voltage the mechanism 1 with the signal volatge from the circuit 8. The outputs of the comparison circuits 10, 12, and 13 are computed (15) to display the computing results in a display circuit 16.
JP8377681A 1981-06-02 1981-06-02 Identifying and detecting device for gas Pending JPS57198854A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8377681A JPS57198854A (en) 1981-06-02 1981-06-02 Identifying and detecting device for gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8377681A JPS57198854A (en) 1981-06-02 1981-06-02 Identifying and detecting device for gas

Publications (1)

Publication Number Publication Date
JPS57198854A true JPS57198854A (en) 1982-12-06

Family

ID=13812006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8377681A Pending JPS57198854A (en) 1981-06-02 1981-06-02 Identifying and detecting device for gas

Country Status (1)

Country Link
JP (1) JPS57198854A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60198446A (en) * 1984-03-23 1985-10-07 Hitachi Ltd Gas detector
JPS6148756A (en) * 1984-08-17 1986-03-10 Mitsubishi Electric Corp Gas detecting device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55132940A (en) * 1979-04-05 1980-10-16 Asahi Glass Co Ltd Atmosphere gas measuring device
JPS55157097A (en) * 1979-05-23 1980-12-06 Matsushita Electric Ind Co Ltd Detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55132940A (en) * 1979-04-05 1980-10-16 Asahi Glass Co Ltd Atmosphere gas measuring device
JPS55157097A (en) * 1979-05-23 1980-12-06 Matsushita Electric Ind Co Ltd Detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60198446A (en) * 1984-03-23 1985-10-07 Hitachi Ltd Gas detector
JPH0532695B2 (en) * 1984-03-23 1993-05-17 Hitachi Ltd
JPS6148756A (en) * 1984-08-17 1986-03-10 Mitsubishi Electric Corp Gas detecting device
JPH0435029B2 (en) * 1984-08-17 1992-06-09 Mitsubishi Electric Corp

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