GB776770A - Improvements in or relating to gas detection method and apparatus - Google Patents
Improvements in or relating to gas detection method and apparatusInfo
- Publication number
- GB776770A GB776770A GB4024/54A GB402454A GB776770A GB 776770 A GB776770 A GB 776770A GB 4024/54 A GB4024/54 A GB 4024/54A GB 402454 A GB402454 A GB 402454A GB 776770 A GB776770 A GB 776770A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxygen content
- current
- circuit
- cell
- meter
- 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
- 238000001514 detection method Methods 0.000 title 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 9
- 229910052760 oxygen Inorganic materials 0.000 abstract 9
- 239000001301 oxygen Substances 0.000 abstract 9
- 239000007789 gas Substances 0.000 abstract 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 5
- 229910052799 carbon Inorganic materials 0.000 abstract 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract 2
- 239000007788 liquid Substances 0.000 abstract 2
- 239000011244 liquid electrolyte Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 239000011701 zinc Substances 0.000 abstract 2
- 229910052725 zinc Inorganic materials 0.000 abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 1
- 230000032683 aging Effects 0.000 abstract 1
- 235000019270 ammonium chloride Nutrition 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 210000003298 dental enamel Anatomy 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000000835 electrochemical detection Methods 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 239000012466 permeate Substances 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 abstract 1
- 239000010935 stainless steel Substances 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
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
- G01N27/403—Cells and electrode assemblies
- G01N27/404—Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid, e.g. Clark-type oxygen sensors
Abstract
776,770. Electric tests. MINE SAFETY APPLIANCES CO. Feb. 11, 1954 [Feb. 26, 1953], No. 4024/54. Class 37. A cell for the electrochemical detection of the percentage oxidizing component (e.g. oxygen) of a gas mixture comprises a zinc electrode, and a carbon electrode whose surface is insulated except for a small window area, the gas being passed through a central bore of the carbon electrode to permeate through the untreated window area and react with a liquid electrolyte, producing an E.M.F. which is indicative of the percentage oxygen content of the gas mixture, and is measured in a circuit giving a substantially linear response characteristic. Cell construction.-The cell container 1 (Fig. 1), of insulating material contains a liquid dielectric, a zinc electrode 3 supported by a stainless steel rod 4, and a carbon electrode 5 whose external surface is coated with enamel 5b except for recessed windows 6, which may be one to four in number depending on the percentage oxygen content to be measured. The gas is passed through a hole 5a running through the middle of the carbon electrode 5, the gas and the liquid electrolyte diffusing through the window 6 of the carbon rod 5 to give an output voltage dependent on the percentage oxygen content. The liquid dielectric is a 2-5 per cent solution of ammonium chloride with hydrochloric or sulphuric acid added to a pH of 3.0. Measuring circuit.-In one embodiment (Fig. 14), the output current of the cell 1 is made proportional to the percentage oxygen content by backing off the current at zero oxygen content with an auxiliary battery 16, which produces a substantially constant P.D. across the tapped-off part of a potentiometer 17 to oppose the zero current, whereupon the current shown in meter 22 is made substantially proportional to the oxygen content of the gas passing through the cell 1 by a predetermined choice of circuit component values. In another method using the same circuit and based on the fact that the percentage oxygen content is proportional to the electrical power developed, the voltage on meter 27 and the current on meter 22 are made constant by adjustment of potentiometers 17 and 21, whereupon the oxygen content is proportional to the current in the auxiliary circuit as indicated by meter 25. The circuit may also include an adjustable shunt resistor 28 (Fig. 11), across the auxiliary battery 16 to simulate the ageing of the cell 1, and a zero adjusting circuit 31 which supplies a small zeroizing current through the meter 22. Specifications 749,147 and 776,771 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US776770XA | 1953-02-26 | 1953-02-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB776770A true GB776770A (en) | 1957-06-12 |
Family
ID=22139451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4024/54A Expired GB776770A (en) | 1953-02-26 | 1954-02-11 | Improvements in or relating to gas detection method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB776770A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1278763B (en) * | 1956-02-27 | 1968-09-26 | Mine Safety Appliances Co | Circuit arrangement for measuring the concentration of a depolarizing component of a gas mixture |
| DE2945777A1 (en) * | 1979-11-13 | 1981-05-21 | GIMAT Gesellschaft für Industrielle Mess- und Automationstechnik mbH, 8121 Polling | Potentiometric oxygen meter - using prim. zinc air cell as measuring and reference electrode |
-
1954
- 1954-02-11 GB GB4024/54A patent/GB776770A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1278763B (en) * | 1956-02-27 | 1968-09-26 | Mine Safety Appliances Co | Circuit arrangement for measuring the concentration of a depolarizing component of a gas mixture |
| DE2945777A1 (en) * | 1979-11-13 | 1981-05-21 | GIMAT Gesellschaft für Industrielle Mess- und Automationstechnik mbH, 8121 Polling | Potentiometric oxygen meter - using prim. zinc air cell as measuring and reference electrode |
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