EP0235222A1 - Transducteur pour debitmetres a induction magnetique - Google Patents

Transducteur pour debitmetres a induction magnetique

Info

Publication number
EP0235222A1
EP0235222A1 EP19860905270 EP86905270A EP0235222A1 EP 0235222 A1 EP0235222 A1 EP 0235222A1 EP 19860905270 EP19860905270 EP 19860905270 EP 86905270 A EP86905270 A EP 86905270A EP 0235222 A1 EP0235222 A1 EP 0235222A1
Authority
EP
European Patent Office
Prior art keywords
ceramic
measuring
metal
transducer
measuring tube
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.)
Pending
Application number
EP19860905270
Other languages
German (de)
English (en)
Inventor
Helmut Engelhardt
Franz Bittner
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.)
Rheometron AG
Original Assignee
Rheometron 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 Rheometron AG filed Critical Rheometron AG
Publication of EP0235222A1 publication Critical patent/EP0235222A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/584—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of electrodes, accessories therefor

Definitions

  • the invention relates to a transducer for electromagnetic flowmeters, which consists of an electrically insulating ceramic measuring tube with sintered-in metallic measuring electrodes.
  • Magnetic-inductive flowmeters are assigned to a tubular measuring sensor, which is attached between the connecting flanges of a pipeline and through which a conductive liquid flows transversely to the direction of a magnetic field.
  • the voltage which is proportional to the flow velocity, is tapped at two measuring electrodes and fed to a measured value converter via current conductors.
  • the measuring tube of the transducer consists either of a metal tube provided on the inner jacket with an insulating layer or of a plastic tube or of a ceramic tube which is used because of its suitability for high temperatures and its resistance to aggressive liquids. In applications where the measuring electrodes with the flowing If the medium comes into direct contact (contact electrodes), the electrode is inserted radially into the jacket of the measuring tube, special sealing measures being taken.
  • the object of the invention is to equip a measuring transducer of the generic type with capacitive surface electrodes which are an integral part of the measuring tube and the ceramic mass between the electrode surfaces and the medium flowing through is as thin as possible.
  • each measuring electrode consists of a metal network which is embedded coaxially in the ceramic mass of the measuring tube shell and is sintered in tightly.
  • the use of a metal net enables a dense sintering into the ceramic mass, as would not be possible with a metal foil.
  • the metal nets with the associated connecting wires are preferably used when shaping the ceramic raw material mass, e.g. B. pressing, isostatic pressing or the like. Embedded in this raw material mass and densely sintered in ceramic firing.
  • the sintered-in metal meshes prevent the formation of cracks or the spalling of ceramic mass in the ceramic measuring tube due to different thermal expansion between the metallic electrode material and the ceramic material.
  • the ceramic mass covering the inner surface of the metal nets can therefore be very thin, for example 1 to 5 mm thick, in order to achieve high measuring accuracy.
  • the sintered ones can therefore be very thin, for example 1 to 5 mm thick, in order to achieve
  • Metal nets are an integral part of the measuring tube, so that the mounting of the sensor is considerably simplified.
  • the connections of the metal networks can be designed differently.
  • the metal net is preferably provided with a connecting wire which protrudes radially from the measuring tube jacket and is likewise tightly sintered into the ceramic mass.
  • the metal net usually consists of platinum wire, which connects to the ceramic mass at a correspondingly high firing temperature.
  • Fig. 1 is equipped with two metallic surface electrodes ceramic measuring tube and
  • FIG. 2 shows the object of FIG. 1 in a side view and partially cut open to show a surface electrode.
  • the ceramic measuring tube 1 shown in FIGS. 1 and 2 is part of a transducer for a magnetic-inductive flow meter.
  • the ceramic measuring tube 1 consists of a ceramic material with essentially electrically insulating properties.
  • the ceramic material is selected so that the measuring tube 1 has a high resistance to temperature changes, strength, abrasion resistance and corrosion resistance.
  • These materials also referred to as hard ceramics, include, for example, the material group referred to as oxide ceramics, but also silicon nitride or the like.
  • Two metal nets 2 constructed from wires 3 and 4 are provided as measuring electrodes; the wires 3 and 4 are preferably made of platinum or platinum alloys. However, other metals that can be sintered into the ceramic mass without losing their metallic, current-conducting property are also suitable.
  • the network can be of any design, but the distance between the wires should be so large that sufficient ceramic mass remains between them.
  • the metal networks 2 are included one connecting wire 5, preferably also made of platinum.
  • the wires 3 and 4 can be fastened to one another by spot welding, and the connecting wire 5 can be welded to the metal net 2.
  • the pulverulent ceramic raw material is filled into a press mold, the two metal nets 2 being inserted in the predetermined position.
  • the green body is then compacted with the help of stamp presses or by isostatic pressing and fired or sintered in a ceramic-tight manner depending on the type of raw material.
  • stamp presses or by isostatic pressing and fired or sintered in a ceramic-tight manner depending on the type of raw material.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Pour équiper d'électrodes de surface capacitives un transducteur pour débitmètres à induction magnétique, qui comporte un tube gradué en céramique électriquement isolant avec des électrodes de mesure métalliques vitrifiées, des réseaux métalliques (2) de platine sont noyés et vitrifiés de manière hermétique dans la masse de la céramique du tube gradué (1). Ces réseaux métalliques (2) sont pourvus de fils de raccordement (5) faisant saillie sur l'enveloppe du tube et également vitrifiés de manière hermétique dans la masse de la céramique.
EP19860905270 1985-08-23 1986-08-19 Transducteur pour debitmetres a induction magnetique Pending EP0235222A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3530133 1985-08-23
DE3530133 1985-08-23

Publications (1)

Publication Number Publication Date
EP0235222A1 true EP0235222A1 (fr) 1987-09-09

Family

ID=6279173

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860905270 Pending EP0235222A1 (fr) 1985-08-23 1986-08-19 Transducteur pour debitmetres a induction magnetique

Country Status (4)

Country Link
EP (1) EP0235222A1 (fr)
JP (1) JPH0648207B2 (fr)
AU (1) AU6337286A (fr)
WO (1) WO1987001197A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289725A (en) * 1991-07-31 1994-03-01 The Foxboro Company Monolithic flow tube with improved dielectric properties for use with a magnetic flowmeter
EP1089060A1 (fr) * 1999-09-22 2001-04-04 Weihong Liu Débitmetre électrodynamique
DE102022210183A1 (de) * 2022-09-27 2024-03-28 Siemens Aktiengesellschaft Verfahren zum Herstellen einer Messröhre Durchflussmessgerät, Computerprogrammprodukt und Verwendung eines Durchflussmessgeräts

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286522A (en) * 1963-08-13 1966-11-22 Vincent J Cushing Magnetoelectric flowmeter apparatus
FR2368018A1 (fr) * 1976-10-14 1978-05-12 Otic Fischer & Porter Debitmetre electromagnetique de precision
DE2950039C2 (de) * 1979-12-13 1982-11-25 Krohne Meßtechnik GmbH & Co KG, 4100 Duisburg Elektroden für elektromagnetische Durchflußmesser
JPS58196419A (ja) * 1982-05-12 1983-11-15 Yokogawa Hokushin Electric Corp 電磁流量計の測定管の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8701197A1 *

Also Published As

Publication number Publication date
AU6337286A (en) 1987-03-10
JPH0648207B2 (ja) 1994-06-22
WO1987001197A1 (fr) 1987-02-26
JPS63501033A (ja) 1988-04-14

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Legal Events

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Inventor name: ENGELHARDT, HELMUT

Inventor name: BITTNER, FRANZ