GB536059A - Improvements in or relating to method of and apparatus for selective testing of combustible gases - Google Patents

Improvements in or relating to method of and apparatus for selective testing of combustible gases

Info

Publication number
GB536059A
GB536059A GB28740/39A GB2874039A GB536059A GB 536059 A GB536059 A GB 536059A GB 28740/39 A GB28740/39 A GB 28740/39A GB 2874039 A GB2874039 A GB 2874039A GB 536059 A GB536059 A GB 536059A
Authority
GB
United Kingdom
Prior art keywords
filament
resistance
testing
gas
resistances
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
GB28740/39A
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.)
MSA Safety Inc
Original Assignee
Mine Safety Appliances Co
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 Mine Safety Appliances Co filed Critical Mine Safety Appliances Co
Publication of GB536059A publication Critical patent/GB536059A/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
    • G01N27/14—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

Abstract

536,059. Gas analysis. MINE SAFETY APPLIANCES CO. Oct. 26, 1939, No. 28740. Convention date, Nov. 4, 1938. [Class 1 (i)] In apparatus for testing for combustible gases, of the type wherein the gas is burned on an electrically heated filament arranged in a Wheatstone bridge or like circuit, a resistance is provided in the circuit whereby a predetermined change in the temperature of the filament may be made thus adapting it for the estimation of gases with different ignition points. In Fig. 1 the Wheatstone bridge comprises the testing filament 16, compensating filament 14 and resistances 10, 12, and is supplied with current from battery 28 through adjustable resistance 32 which compensates for variations of battery voltage. Resistance 36 reduces the filament voltage to that appropriate to the lower ignition point ; it can be short-circuited by switch 38. Resistance 26 in parallel with the galvanometer serves to calibrate the instrument to give direct readings of gas percentages. In a modification (not shown) two such resistances are provided which may be alternatively used so that the same calibration serves for both filament temperatures. The galvonometer may be switched over into the dotted position for the purpose of testing or adjusting the battery voltage. Specification 522,942 is referred to.
GB28740/39A 1938-11-04 1939-10-26 Improvements in or relating to method of and apparatus for selective testing of combustible gases Expired GB536059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US536059XA 1938-11-04 1938-11-04

Publications (1)

Publication Number Publication Date
GB536059A true GB536059A (en) 1941-05-01

Family

ID=21985386

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28740/39A Expired GB536059A (en) 1938-11-04 1939-10-26 Improvements in or relating to method of and apparatus for selective testing of combustible gases

Country Status (1)

Country Link
GB (1) GB536059A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870025A (en) * 1985-09-30 1989-09-26 Ford Motor Company Method of sensing methane gas-I

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4870025A (en) * 1985-09-30 1989-09-26 Ford Motor Company Method of sensing methane gas-I

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