GB690701A - Improvements in and relating to the determination, recording or control of impurities, especially oxygen, in industrial gases, or in liquids - Google Patents
Improvements in and relating to the determination, recording or control of impurities, especially oxygen, in industrial gases, or in liquidsInfo
- Publication number
- GB690701A GB690701A GB480450A GB480450A GB690701A GB 690701 A GB690701 A GB 690701A GB 480450 A GB480450 A GB 480450A GB 480450 A GB480450 A GB 480450A GB 690701 A GB690701 A GB 690701A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- solution
- gas
- carbon dioxide
- component
- 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
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
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4162—Systems investigating the composition of gases, by the influence exerted on ionic conductivity in a liquid
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Gas Separation By Absorption (AREA)
Abstract
<PICT:0690701/III/1> The amount of a component of a gas mixture is automatically determined and recorded by feeding an electrolyte solution, capable of absorbing and reacting with the component, at constant head through a special orifice in vessel 1, via cooling zone 2, to conductivity cell 3, mixing it (e.g. in coils 6 61) with the gas to be tested, leading the solution via a second cooling zone 12 to second conductivity cell 13 connected in a Wheatstone network with the other cell, and using the electromotive force developed across the bridge (or the change in resistance necessary to balance the bridge) to record the amount of the component present. The special orifice is circular, and has frusto-conical convergent inlet and divergent outlet ducts, and a knife edge of thickness not exceeding 5/1000 inch. The cross-section of the cooling zones and conductivity cells has a breadth: length ratio of not more than 1 : 3, and preferably 1 : 5 to 1 : 10. Gas is fed to the apparatus at constant rate from inlet 7 via capillary flowmeter 8 and capillary tubes 11, 111 to the coils. In one form of electrical circuit Fig. 2. (not shown), the two cells are in parallel in the Wheatstone network, the other arm including standard and variable resistances; output from the bridge passes through a rectifier to a recording ammeter. In an alternative arrangement, Fig. 5, (not shown), the cells are in series, the resistance of both arms of the bridge may be varied, and the bridge system is connected to a self-balancing recorder, which may be of the electronic type. A mechanical valve controlling the supply of the component to the gas mixture may be operated by the output from the bridge through a relay. In the determination of oxygen, e.g. in commercial carbon dioxide, an aqueous solution of chromous sulphate containing hydrochloric acid is preferably used as the electrolyte; also suitable are solutions of vanadium, cobalt, and molybdenum sulphates. The chromous sulphate solution may be prepared by reacting sulphuric acid in an inert atmosphere with metallic chromium and a small piece of a more electropositive metal, e.g. zinc or aluminium; the solution is filtered, diluted, and stored under carbon dioxide. Carbon dioxide may be determined in gas mixtures using aqueous caustic potash, sulphur dioxide using a solution of bromine and sulphuric acid, and carbon monoxide by preliminary oxidation to carbon dioxide; other gaseous components which may be measured are hydrogen sulphide and ammonia. The oxyenf content of boiler feed water may be measured by expelling oxygen from the water, and mixing it with an inert gas. Specification 641,978 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB480450A GB690701A (en) | 1950-02-24 | 1950-02-24 | Improvements in and relating to the determination, recording or control of impurities, especially oxygen, in industrial gases, or in liquids |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB480450A GB690701A (en) | 1950-02-24 | 1950-02-24 | Improvements in and relating to the determination, recording or control of impurities, especially oxygen, in industrial gases, or in liquids |
Publications (1)
Publication Number | Publication Date |
---|---|
GB690701A true GB690701A (en) | 1953-04-29 |
Family
ID=9784124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB480450A Expired GB690701A (en) | 1950-02-24 | 1950-02-24 | Improvements in and relating to the determination, recording or control of impurities, especially oxygen, in industrial gases, or in liquids |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB690701A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1090004B (en) * | 1957-09-30 | 1960-09-29 | Friedrich Toedt Dr Ing | Device for determining the concentration of electrochemically oxidizable or reducible components in gas mixtures |
DE1179295B (en) * | 1959-07-23 | 1964-10-08 | Philips Nv | Bridge circuit for measuring the electrical conductivity of an electrolyte |
-
1950
- 1950-02-24 GB GB480450A patent/GB690701A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1090004B (en) * | 1957-09-30 | 1960-09-29 | Friedrich Toedt Dr Ing | Device for determining the concentration of electrochemically oxidizable or reducible components in gas mixtures |
DE1179295B (en) * | 1959-07-23 | 1964-10-08 | Philips Nv | Bridge circuit for measuring the electrical conductivity of an electrolyte |
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