GB820567A - Improvements in or relating to methods of and apparatus for detecting the presence of carbon dioxide in a gas, for example in air - Google Patents

Improvements in or relating to methods of and apparatus for detecting the presence of carbon dioxide in a gas, for example in air

Info

Publication number
GB820567A
GB820567A GB2489/56A GB248956A GB820567A GB 820567 A GB820567 A GB 820567A GB 2489/56 A GB2489/56 A GB 2489/56A GB 248956 A GB248956 A GB 248956A GB 820567 A GB820567 A GB 820567A
Authority
GB
United Kingdom
Prior art keywords
carbon dioxide
gas
air
relating
reduction
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
GB2489/56A
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
Publication of GB820567A publication Critical patent/GB820567A/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
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators

Abstract

Carbon dioxide is detected in a gas by passing the gas through an indicator tube containing hydrazine and a reduction-oxidation indicator supported on a granular carrier, the presence of carbon dioxide causing the reagent to change colour. The reduction-oxidation indicator may be a triphenylmethane dyestuff, e.g. methyl violet, and may be dissolved in a polyvalent alcohol, e.g. glycol or glycerine. In an example the carrier is calcium aluminium silicate. The amount of carbon dioxide present may be estimated from the length of the colour change in the tube. The carbon dioxide content of flue gas or the air in coal mines may be measured; the test is also of use in the manufacture of silage, coal gas, or carbon dioxide itself, and in the fermentation of beer.
GB2489/56A 1955-08-12 1956-01-25 Improvements in or relating to methods of and apparatus for detecting the presence of carbon dioxide in a gas, for example in air Expired GB820567A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE820567X 1955-08-12

Publications (1)

Publication Number Publication Date
GB820567A true GB820567A (en) 1959-09-23

Family

ID=6737566

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2489/56A Expired GB820567A (en) 1955-08-12 1956-01-25 Improvements in or relating to methods of and apparatus for detecting the presence of carbon dioxide in a gas, for example in air

Country Status (1)

Country Link
GB (1) GB820567A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2209394A (en) * 1987-09-01 1989-05-10 Draegerwerk Ag Colorimetric test tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2209394A (en) * 1987-09-01 1989-05-10 Draegerwerk Ag Colorimetric test tube

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