FR2260796A1 - Measuring instrument for combustible gas concentrations in air - is unaffected by changes in gas mixture conductivity or ambient temp. - Google Patents

Measuring instrument for combustible gas concentrations in air - is unaffected by changes in gas mixture conductivity or ambient temp.

Info

Publication number
FR2260796A1
FR2260796A1 FR7404435A FR7404435A FR2260796A1 FR 2260796 A1 FR2260796 A1 FR 2260796A1 FR 7404435 A FR7404435 A FR 7404435A FR 7404435 A FR7404435 A FR 7404435A FR 2260796 A1 FR2260796 A1 FR 2260796A1
Authority
FR
France
Prior art keywords
measuring instrument
unaffected
changes
air
bridge
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
FR7404435A
Other languages
French (fr)
Other versions
FR2260796B1 (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.)
Vysoka Skola Chemicko Technologicka V Praze
Original Assignee
Vysoka Skola Chemicko Technologicka V Praze
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
Priority to DE19742404014 priority Critical patent/DE2404014A1/en
Priority to CH122174A priority patent/CH566002A5/xx
Application filed by Vysoka Skola Chemicko Technologicka V Praze filed Critical Vysoka Skola Chemicko Technologicka V Praze
Priority to FR7404435A priority patent/FR2260796A1/en
Publication of FR2260796A1 publication Critical patent/FR2260796A1/en
Application granted granted Critical
Publication of FR2260796B1 publication Critical patent/FR2260796B1/fr
Granted 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
    • 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
    • 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
    • G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital
    • G01N33/0067—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital by measuring the rate of variation of the concentration

Abstract

Gas concentration is measured by burning at a catalytic electrically heated element connected in a measuring bridge. The bridge is connected to a derivation device which is connected in turn through an integrating device to a measuring instrument, e.g. a voltmeter. The integrating device is connected to a time control circuit which is also connected to the bridge. Two identical electric heating elements are used, one for making the measurement, and the other as a comparison, and the other two arms of the bridge comprise resistors.
FR7404435A 1974-01-29 1974-02-11 Measuring instrument for combustible gas concentrations in air - is unaffected by changes in gas mixture conductivity or ambient temp. Granted FR2260796A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19742404014 DE2404014A1 (en) 1974-01-29 1974-01-29 ARRANGEMENT FOR MEASURING THE CONCENTRATION OF COMBUSTION GASES IN THE AIR BY CATALYTIC BURNING
CH122174A CH566002A5 (en) 1974-01-29 1974-01-29
FR7404435A FR2260796A1 (en) 1974-01-29 1974-02-11 Measuring instrument for combustible gas concentrations in air - is unaffected by changes in gas mixture conductivity or ambient temp.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19742404014 DE2404014A1 (en) 1974-01-29 1974-01-29 ARRANGEMENT FOR MEASURING THE CONCENTRATION OF COMBUSTION GASES IN THE AIR BY CATALYTIC BURNING
CH122174A CH566002A5 (en) 1974-01-29 1974-01-29
FR7404435A FR2260796A1 (en) 1974-01-29 1974-02-11 Measuring instrument for combustible gas concentrations in air - is unaffected by changes in gas mixture conductivity or ambient temp.

Publications (2)

Publication Number Publication Date
FR2260796A1 true FR2260796A1 (en) 1975-09-05
FR2260796B1 FR2260796B1 (en) 1977-06-10

Family

ID=27172801

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7404435A Granted FR2260796A1 (en) 1974-01-29 1974-02-11 Measuring instrument for combustible gas concentrations in air - is unaffected by changes in gas mixture conductivity or ambient temp.

Country Status (3)

Country Link
CH (1) CH566002A5 (en)
DE (1) DE2404014A1 (en)
FR (1) FR2260796A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2356135A1 (en) * 1976-06-22 1978-01-20 Auergesellschaft Gmbh MOUNTING FOR THE MEASURING BRIDGE OF A GAS DETECTOR
FR2424817A1 (en) * 1978-05-03 1979-11-30 Bobst Sa DEVICE FOR ADJUSTING THE MINIMUM CONCENTRATION OF SOLVENT VAPOR IN A GAS GIVEN BY PRINTING INK

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0507895D0 (en) * 2005-04-19 2005-05-25 City Tech Gas sensor assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2356135A1 (en) * 1976-06-22 1978-01-20 Auergesellschaft Gmbh MOUNTING FOR THE MEASURING BRIDGE OF A GAS DETECTOR
FR2424817A1 (en) * 1978-05-03 1979-11-30 Bobst Sa DEVICE FOR ADJUSTING THE MINIMUM CONCENTRATION OF SOLVENT VAPOR IN A GAS GIVEN BY PRINTING INK

Also Published As

Publication number Publication date
FR2260796B1 (en) 1977-06-10
CH566002A5 (en) 1975-08-29
DE2404014A1 (en) 1975-08-07

Similar Documents

Publication Publication Date Title
GB1023231A (en) Improvements in and relating to gas detecting devices
ATE117083T1 (en) METHOD AND DEVICE FOR MEASURING THE THERMAL CONDUCTIVITY OF GASES.
US2596992A (en) Apparatus for gas analysis
FR2260796A1 (en) Measuring instrument for combustible gas concentrations in air - is unaffected by changes in gas mixture conductivity or ambient temp.
GB1500584A (en) Method and apparatus for determining the moisture content of different kinds of materials
FR2305720A1 (en) Measuring and recording cutaneous temperature - involves using probe containing thermal resistors for measurement and controlling probe body temperature
US3497323A (en) Apparatus for measuring the concentration of combustible gases and vapors
ES463041A1 (en) Method and apparatus for measuring oxygen content of gaseos mixture
DE68922098T2 (en) Method and device for measuring the concentration of a paramagnetic gas.
ATE82801T1 (en) DEVICE FOR DETECTING GASEOUS HYDROCARBONS.
US3370457A (en) Gas detector
SU138076A1 (en) Electric gas analyzer
US3187559A (en) Combustion gas analyzer
SU146908A1 (en) The method of controlling the concentration of inhaled drugs during inhalation anesthesia
SU579569A1 (en) Gas detector
Minter The thermal conductivity method of gas analysis.
SU700829A1 (en) Thermoelectric device for inspection of metals and alloys
GB971507A (en) Improvements in or relating to electrical measuring apparatus
GB687427A (en) An improved instrument for measuring temperature, air velocities, rate of cooling and the thermal conductivity of gases
Pritchard A modified" thermal conductivity" gas analyser for measuring methane in air or carbon dioxide
SU924503A1 (en) Device for measuring displacements
GB1320954A (en) Selective combustion process for hydrogen-containing comustibles and apparatus therefor
GB1450776A (en) Flammable gas detector
SU397829A1 (en) METHOD OF SELECTIVE ANALYSIS
SU78131A1 (en) Apparatus for determining the level of liquid and gas interface

Legal Events

Date Code Title Description
ST Notification of lapse