EP0000182A1 - Dispositif pour la mesure du contenu en électrolyte de l'air - Google Patents

Dispositif pour la mesure du contenu en électrolyte de l'air Download PDF

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Publication number
EP0000182A1
EP0000182A1 EP78100220A EP78100220A EP0000182A1 EP 0000182 A1 EP0000182 A1 EP 0000182A1 EP 78100220 A EP78100220 A EP 78100220A EP 78100220 A EP78100220 A EP 78100220A EP 0000182 A1 EP0000182 A1 EP 0000182A1
Authority
EP
European Patent Office
Prior art keywords
water
electrodes
air
measuring
vessel
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.)
Withdrawn
Application number
EP78100220A
Other languages
German (de)
English (en)
Inventor
Rudolf Brechtel
Johannes Mandl
Hans Friedrich Sobotka
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.)
Arn Georg AG
Original Assignee
ARN GEORG AG
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 ARN GEORG AG filed Critical ARN GEORG AG
Publication of EP0000182A1 publication Critical patent/EP0000182A1/fr
Withdrawn legal-status Critical Current

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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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/23—Pc programming
    • G05B2219/23427—Selection out of several programs, parameters

Definitions

  • the invention works with a closed water circuit, in which the water supplied to the measuring electrodes is deionized again and again, so that, apart from the evaporation losses caused by the measured air, no water has to be replaced. If one operates the measuring device with alternating current at the measuring electrodes and in this way switches off zero point movements, which could be caused by the electrolysis effect during direct current operation, the device can work for a very long time without any maintenance.
  • the device can be used by unskilled personnel. It is only necessary to calibrate the display scale with a calibration gas by qualified specialist personnel.
  • the specified electrode arrangement has a relatively large surface, which is brought into contact with the air to be examined, and is capable of contacting one with a relatively small mutual distance between the electrodes relatively small water flow to work. It is sufficient if the water is added dropwise.
  • the drip amount is preferably kept constant by means of a capillary, which is under a constant liquid pressure, which is generated in a simple manner with the aid of an overflow vessel. From the defined amount of air conducted past the electrodes per unit of time and the resultant evaporation and the defined addition of dripping water, depending on the acid content of the examined air, a certain conductance is set between the electrodes, which can be measured. Range switching of the measuring device can expediently take place on the electronic measuring circuit to which the electrodes are connected.
  • the high sensitivity of the measuring device results on the one hand from the chosen electrode arrangement, and on the other hand from the very small amount of water that is effective on it (fractions of ml).
  • the arrangement is not selectively sensitive to hydrochloric acid, but to all impurities which, when dissolved in water, cause an increase in conductivity between electrodes.
  • the device can thus also be used to control the exhaust gases from hot-dip galvanizing baths or to control the ventilation in laboratories and other types of plants. If the electrode arrangement remains unchanged, all that is required is a corresponding adjustment of the sensitivity of the electronic measuring circuit.
  • the centerpiece of the device according to the invention is a closed, essentially tubular chamber 1, preferably made of glass, in which two cotton-insulated silver wires 2 are arranged close to one another, running approximately perpendicularly.
  • the insulated silver wires 2 are wrapped together with a cotton thread.
  • the insulation and the wrapping thread form a cushion 3, which can be soaked with water.
  • the chamber is provided with a water inlet 4 above the silver wires 2 and with a water outlet 5 at the lower end.
  • the chamber 1 has an air inlet 6 in the lower region and an air outlet 7 in the upper region. Air inlet 6 and air outlet 7 are arranged such that air flowing from the inlet 6 to the outlet 7 inevitably passes along the silver wires 2.
  • a water vessel 9 Arranged above the chamber 1 is a water vessel 9 provided with an upper run 8, the lower outlet 10 of which is connected to the water inlet 4 on the chamber 1 via a capillary 11.
  • the water outlet 5 of the chamber 1 is connected to a collecting container 12.
  • the upper run 8 is connected to the collecting container 12 via a bypass line 13.
  • a water pump 14 pumps the water collected in the container 12 back through a line 15 into the container 9 above the chamber 1.
  • An ion exchanger 16 is arranged in front of or behind the pump 14 in this return line 15.
  • a suction air pump 17 is connected, the outlet 18 leads to the outside.
  • At the air inlet 6 of the chamber 1 is an open end Tube 19 connected, through which the air to be tested is sucked in.
  • the two silver wires 2 are electrically connected to an electronic AC measuring circuit 20, to which a measuring instrument 21 and possibly a warning device is connected.
  • a water level is determined in the vessel 9 from the height h of the upper course 8, which results in a corresponding pressure at the outlet 10 of the vessel 9, so that a constant amount of water is conveyed through the capillary 11, provided that the water level in the vessel 9 is maintained by the pump 14.
  • the pump 14 pumps more water than can drip through the capillary 11, the excess water flows through the overflow 8 directly into the collecting vessel 12.
  • the water dripping from the inlet 4 into the chamber drips onto the electrode arrangement and is taken up by its cotton cushion.
  • the air pump 17 delivers a constant amount of air per unit of time through the pipe 19 and the chamber 1.
  • a conductivity determined by the acid content of the sucked-in air is established between the electronics 2, which is evaluated by the electronic measuring circuit 20 and displayed by the measuring instrument 21.
  • the two measuring electrodes are arranged so close to one another that the water remains between them due to capillary action, a cushion between the electrodes can also be dispensed with.

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  • 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)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Sampling And Sample Adjustment (AREA)
EP78100220A 1977-06-22 1978-06-22 Dispositif pour la mesure du contenu en électrolyte de l'air Withdrawn EP0000182A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2728152 1977-06-22
DE19772728152 DE2728152C3 (de) 1977-06-22 1977-06-22 Vorrichtung zum Messen des Elektrolytgehalts von Luft

Publications (1)

Publication Number Publication Date
EP0000182A1 true EP0000182A1 (fr) 1979-01-10

Family

ID=6012106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100220A Withdrawn EP0000182A1 (fr) 1977-06-22 1978-06-22 Dispositif pour la mesure du contenu en électrolyte de l'air

Country Status (2)

Country Link
EP (1) EP0000182A1 (fr)
DE (1) DE2728152C3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479466A2 (fr) * 1990-10-03 1992-04-08 British Nuclear Fuels PLC Appareil de contrôle de ruthénium

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB797835A (en) * 1955-04-04 1958-07-09 John Frederick Zwicky Improvements relating to gas-detecting apparatus
DE1066040B (de) * 1960-02-18 Bergwerks v rband GmbH Essen Kray Gasanalyse gerat
FR1398748A (fr) * 1963-10-03 1965-05-14 Air Liquide Procédé de dosage de traces de gaz ionisables
DE1808055A1 (de) * 1968-11-09 1970-05-27 Chemie Technik Gmbh Verfahren und Vorrichtung zum Messen von Gasspuren in gasfoermigen Medien,insbesondere von aggressiven Gasen und Daempfen
FR2267546A1 (en) * 1974-04-10 1975-11-07 Philips Nv Gas analysis by conductimetric cell - using recycled deionised water with ion exchange resin under reduced pressure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2943488A (en) * 1957-05-27 1960-07-05 Robertshaw Fulton Controls Co Humidistat
US3308648A (en) * 1963-09-12 1967-03-14 Chemetron Corp Gas measuring method and apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1066040B (de) * 1960-02-18 Bergwerks v rband GmbH Essen Kray Gasanalyse gerat
GB797835A (en) * 1955-04-04 1958-07-09 John Frederick Zwicky Improvements relating to gas-detecting apparatus
FR1398748A (fr) * 1963-10-03 1965-05-14 Air Liquide Procédé de dosage de traces de gaz ionisables
DE1808055A1 (de) * 1968-11-09 1970-05-27 Chemie Technik Gmbh Verfahren und Vorrichtung zum Messen von Gasspuren in gasfoermigen Medien,insbesondere von aggressiven Gasen und Daempfen
FR2267546A1 (en) * 1974-04-10 1975-11-07 Philips Nv Gas analysis by conductimetric cell - using recycled deionised water with ion exchange resin under reduced pressure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479466A2 (fr) * 1990-10-03 1992-04-08 British Nuclear Fuels PLC Appareil de contrôle de ruthénium
EP0479466A3 (en) * 1990-10-03 1992-11-25 British Nuclear Fuels Plc Ruthenium monitor

Also Published As

Publication number Publication date
DE2728152C3 (de) 1981-11-05
DE2728152A1 (de) 1979-01-04
DE2728152B2 (de) 1981-02-26

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Inventor name: SOBOTKA, HANS FRIEDRICH

Inventor name: BRECHTEL, RUDOLF

Inventor name: MANDL, JOHANNES