EP0902889A1 - Conduite d'alimentation a isolation minerale - Google Patents

Conduite d'alimentation a isolation minerale

Info

Publication number
EP0902889A1
EP0902889A1 EP98913723A EP98913723A EP0902889A1 EP 0902889 A1 EP0902889 A1 EP 0902889A1 EP 98913723 A EP98913723 A EP 98913723A EP 98913723 A EP98913723 A EP 98913723A EP 0902889 A1 EP0902889 A1 EP 0902889A1
Authority
EP
European Patent Office
Prior art keywords
mineral
inner conductor
insulated
supply line
feed line
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Withdrawn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
EP98913723A
Other languages
German (de)
English (en)
Inventor
Robert Scannell
Annette Kipka
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.)
Heraeus Electro Nite International NV
Original Assignee
Heraeus Electro Nite International NV
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
Priority claimed from DE19808030A external-priority patent/DE19808030A1/de
Application filed by Heraeus Electro Nite International NV filed Critical Heraeus Electro Nite International NV
Publication of EP0902889A1 publication Critical patent/EP0902889A1/fr
Withdrawn legal-status Critical Current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
    • G01N27/26—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
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • 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
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4077—Means for protecting the electrolyte or the electrodes

Definitions

  • the invention relates to a mineral-insulated feed line for a sensor with a jacket and at least one inner conductor arranged in the jacket, which is connected at one end to a sensor element or its feed line, the jacket containing a mineral powder as insulation material.
  • the invention further relates to the use of such a feed line.
  • DE 43 30 447 A1 describes a mineral-insulated supply line for a temperature sensor.
  • This lead has an inner conductor made of a nickel-chromium alloy.
  • a similar feed line is known from DE 69942, in which the inner conductor has wires made of a noble metal, which are surrounded by a jacket made of a nickel-chromium or nickel-chromium-iron alloy.
  • Similar supply lines are known from DE 40 22 051 A1 and from US-A-4,590,669.
  • These mineral insulated supply lines are used for resistance thermometers or as thermocouple wires. They make use of the property of the measuring element that its electrical resistance or thermal voltage depends on the temperature of the material.
  • At least one inner conductor is formed from a metal from the group consisting of tantalum, titanium, niobium, molybdenum, vanadium, zirconium, rhenium, osmium or from an alloy based on at least one of these metals.
  • a supply line is very resistant to high temperatures and corrosion, so that it can even be expediently designed and suitable as a supply line for a heater, which may be comprised by a gas sensor, and the supply line is directly exposed to the hot exhaust gas and its corrosive effect is.
  • the second inner conductor should preferably be made of a known iron-chromium-nickel alloy. If, for example, tantalum is used as the anode, a different material can also be selected for the cathode.
  • the at least one inner conductor has a coating which is catalytically active for reducing gases, preferably made of a noble metal or a noble metal alloy.
  • This coating can be used to catalyze reducing gases (hot exhaust gases), in particular H 2 .
  • the jacket is closed at both ends and only has bushings for the at least one inner conductor, so that the insulation material is protected.
  • the mineral-insulated feed line can be used for a gas sensor for measuring gaseous components in a gas mixture and in particular for the feed line of a heater of the gas sensor.
  • FIG. 1 shows a partial section through a mineral-insulated supply line
  • FIG. 2 shows an arrangement for a corrosion test
  • FIG. 3 shows another arrangement for a corrosion test.
  • the mineral-insulated supply line 1 has a jacket 2, which is made of a common metal, for. B. Inconel is formed.
  • a plurality of inner conductors 4 are arranged within the jacket 2, embedded in an insulating material 3.
  • Magnesium oxide or aluminum oxide, for example, can be used as the insulating material 3.
  • the inner conductors 4 are formed from tantalum. They have a coating 5 made of platinum or palladium, which is used to catalyze reducing gases.
  • the inner conductor serving as the cathode is made of Inconel and the inner conductor serving as the anode is made of titanium (or tantalum).
  • at least one sensor element is connected to the inner conductor on one side.
  • Such a sensor element for measuring gaseous components of a gas mixture has a heater which is connected to an inner conductor 4 (anode - titanium).
  • the inner conductor 4 is traversed by current during the measurement, a relatively high current flowing through the inner conductor used as the supply line to the heater. Nevertheless, the inner conductors are very stable, they do not corrode and therefore on the one hand represent a reliable connection to the sensor element and on the other hand enable reproducible measurements over long periods of time.
  • the corrosion resistance is shown below using exemplary tests.
  • the test was carried out in an arrangement shown in FIG. 2.
  • anode A material to be tested
  • a wire with a diameter of approximately 1.5 mm was placed in an electrolyte E submerged.
  • the electrolyte E was formed from a synthetic exhaust gas condensate.
  • a platinum wire with a diameter of approximately 1.5 mm is used as the cathode K.
  • Both anode A and cathode K are partially in the electrolyte E.
  • the electrolyte E contains 250 mg of 96% H 2 SO 4 , 250 mg of 37% HCl, 1 g of NaCl, the rest of distilled water per liter.
  • the voltage between anode A and cathode K is 15 volts.
  • the current flowing between anode A and cathode K is measured and represents a measure of the anodic resolution, since a current only flows until the anode A is dissolved.
  • Test results for some anode materials are shown in Table 1, the first three materials corresponding to the prior art and the last two materials (tantalum and titanium) being materials according to the invention.
  • Table 1 shows that the materials tantalum and titanium are much more stable in the environment relevant to the invention than the known materials.
  • a second corrosion test compares different mineral-insulated cables.
  • the mineral-insulated cable M has a diameter of approximately 3.5 mm and contains an anode A with a diameter of approximately 0.5 mm and a cathode K, likewise with a diameter of approximately 0.5 mm. It becomes an electrolyte E with the same composition as in the corrosion test 1 used.
  • the mineral-insulated cable M from the moisture-proof end of which at least the anode A and the cathode K protrude, is located with this end in the electrolyte E.
  • the voltage between the anode A and the cathode K is 15 volts.
  • the current flowing between anode A and cathode K is measured and represents a measure of the anodic decomposition (corrosion).
  • Table 2 shows in the first line a test with materials according to the prior art (Inconel), both as anode A and as cathode K. In the following three lines, experiments with anode materials according to the invention are listed, different materials being used as the cathode.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)
  • Resistance Heating (AREA)
  • Insulated Conductors (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne une conduite d'alimentation à isolation minérale pour un capteur comportant une gaine et au moins un conducteur central disposé dans la gaine et connecté à l'une de ses extrémités à un élément de capteur, la gaine contenant une poudre minérale comme matériau d'isolation. Afin d'obtenir une conduite résistante aux températures élevées et à la corrosion pour les capteurs de gaz, au moins un conducteur central est réalisé dans un métal du groupe tantale, titane, niobium, molybdène, vanadium, zircon, rhénium, osmium ou dans un alliage à base d'au moins un de ces métaux.
EP98913723A 1997-03-21 1998-03-17 Conduite d'alimentation a isolation minerale Withdrawn EP0902889A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19712026 1997-03-21
DE19712026 1997-03-21
DE19808030A DE19808030A1 (de) 1997-03-21 1998-02-26 Mineralisolierte Zuleitung
DE19808030 1998-02-26
PCT/EP1998/001528 WO1998043076A1 (fr) 1997-03-21 1998-03-17 Conduite d'alimentation a isolation minerale

Publications (1)

Publication Number Publication Date
EP0902889A1 true EP0902889A1 (fr) 1999-03-24

Family

ID=26035123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98913723A Withdrawn EP0902889A1 (fr) 1997-03-21 1998-03-17 Conduite d'alimentation a isolation minerale

Country Status (6)

Country Link
US (1) US6300571B1 (fr)
EP (1) EP0902889A1 (fr)
JP (1) JP2001524252A (fr)
KR (1) KR20000015858A (fr)
BR (1) BR9804787A (fr)
WO (1) WO1998043076A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2831269B1 (fr) * 2001-10-23 2004-01-02 Thales Sa Ensemble de capteur fonctionnant a haute temperature et procede de montage
US8187006B2 (en) * 2009-02-02 2012-05-29 Apex Technologies, Inc Flexible magnetic interconnects
US20110224907A1 (en) * 2010-03-11 2011-09-15 Petrospec Engineering Ltd. Mineral insulated cable for downhole sensors
FR2972289B1 (fr) * 2011-03-01 2013-03-01 Schneider Electric Ind Sas Conducteur de courant
FR3107141B1 (fr) * 2020-02-07 2022-06-03 Thermocoax Cie « Câble blindé à isolant minéral pour ultra haute températures, élément chauffant et câble de transmission, application et procédé de fabrication »

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928071A (en) * 1974-10-04 1975-12-23 Gen Electric Hermetically sealed primary battery
US4267029A (en) * 1980-01-07 1981-05-12 Pennwalt Corporation Anode for high resistivity cathodic protection systems
US4373375A (en) * 1980-12-19 1983-02-15 General Electric Company Hydrogen sensor
DE3300694A1 (de) * 1983-01-11 1984-08-09 Siemens AG, 1000 Berlin und 8000 München Bipolare elektrode fuer medizinische anwendungen
FR2555352B1 (fr) * 1983-11-21 1987-02-20 Thermocoax Cie Cable blinde a isolant mineral et procede de fabrication permettant d'obtenir un tel cable
FR2575321B1 (fr) * 1984-12-21 1988-01-15 Thermocoax Cie Cable blinde a isolant mineral
US5336851A (en) * 1989-12-27 1994-08-09 Sumitomo Electric Industries, Ltd. Insulated electrical conductor wire having a high operating temperature
CA2058147C (fr) * 1991-04-26 1995-08-01 Kazuo Sawada Fil electrique isole
US5156688A (en) * 1991-06-05 1992-10-20 Xerox Corporation Thermoelectric device
JPH06996A (ja) * 1992-06-19 1994-01-11 Hitachi Koki Co Ltd 液滴吐出器
DE59305849D1 (de) * 1992-07-31 1997-04-24 Hoechst Ag Planarer Sensor aus Keramikmaterial zum Nachweis von brennbaren Gasen
US5340455A (en) * 1993-01-22 1994-08-23 Corrpro Companies, Inc. Cathodic protection system for above-ground storage tank bottoms and method of installing
DK94393D0 (da) * 1993-08-18 1993-08-18 Risoe Forskningscenter Fremgangsmaade til fremstilling af calciumdoteret lanthanchromit
DE4338539A1 (de) * 1993-11-11 1995-05-18 Hoechst Ceram Tec Ag Verfahren zum Herstellen von keramischen Heizelementen
DE59409959D1 (de) * 1994-01-05 2001-12-20 Heraeus Electro Nite Int Elektrisch leitende verbindung
US5536478A (en) * 1994-12-01 1996-07-16 Corning Incorporated Electrical leads for a fluid heaters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9843076A1 *

Also Published As

Publication number Publication date
US6300571B1 (en) 2001-10-09
BR9804787A (pt) 1999-08-17
KR20000015858A (ko) 2000-03-15
JP2001524252A (ja) 2001-11-27
WO1998043076A1 (fr) 1998-10-01

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