EP2010869A1 - Capteur de mesure à induction magnétique - Google Patents

Capteur de mesure à induction magnétique

Info

Publication number
EP2010869A1
EP2010869A1 EP07728065A EP07728065A EP2010869A1 EP 2010869 A1 EP2010869 A1 EP 2010869A1 EP 07728065 A EP07728065 A EP 07728065A EP 07728065 A EP07728065 A EP 07728065A EP 2010869 A1 EP2010869 A1 EP 2010869A1
Authority
EP
European Patent Office
Prior art keywords
measuring tube
coil
coil holder
transducer according
magnetic field
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.)
Ceased
Application number
EP07728065A
Other languages
German (de)
English (en)
Inventor
Antonio Magliocca
Werner Wohlgemuth
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.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec 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
Priority claimed from DE200610020265 external-priority patent/DE102006020265A1/de
Application filed by Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP2010869A1 publication Critical patent/EP2010869A1/fr
Ceased 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
    • G01F1/586—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 coils, magnetic circuits, accessories therefor

Definitions

  • the invention relates to a magneto-inductive transducer with a flowed through by a measuring, electrically conductive fluid measuring tube.
  • the volume flow of an electrically conductive fluid measure which flows through a measuring tube of this transducer in a flow direction.
  • a magnetic field of the highest possible density is generated at the transducer by means of a magnetic circuit electrically connected to an exciter electronics of the flow meter, which passes through the fluid within a measuring volume at least partially perpendicular to the flow direction and which closes substantially outside of the fluid.
  • the measuring tube is therefore usually made of non-ferromagnetic material, so that the magnetic field is not adversely affected during measurement.
  • an electric field is generated according to the magneto-hydrodynamic principle in the measuring volume, which is perpendicular to the magnetic field and perpendicular to the flow direction of the fluid.
  • a voltage induced in the fluid can thus be measured.
  • This voltage is a measure of the volume flow.
  • the transducer is constructed so that the induced electric field outside the fluid closes almost exclusively via the evaluation electronics connected to the measuring electrodes.
  • the fluid-contacting, galvanic or the fluid non-contacting, capacitive measuring electrodes can serve.
  • these preferably consist of an outer, esp. Metallic, support tube of specifiable strength and width, which is internally coated with an electrically non-conductive insulating material of predetermined thickness, the so-called liner ,
  • the so-called liner For example, in WO-A 05/057141, WO-A 04/072590, US-A 2005/0000300, US-B 65 95 069, US-A 52 80 727, US-A 46 79 442, the US-A 42 53 340, US-A 32 13 685 or JP-Y 53 - 51 181 each magnetic-inductive transducer described, each pressure-tight in a pipeline insertable metering tube having an inlet-side first end and a second-outlet-side metering tube with an outer shell of the meter tube, and an insulating material-containing tubular liner housed in a lumen of the carrier tube for guiding a flowing and insulated carrier tube Include fluids.
  • the liner serves to chemically isolate the carrier tube from the fluid.
  • the liner In support tubes of high electrical conductivity, esp. In metallic support tubes, the liner also serves as electrical insulation between the support tube and the fluid, which prevents shorting of the electric field via the support tube.
  • the liner which is usually made of a thermoset or thermosetting plastic, for its stabilization, as for example in EP-A 36 513, EP-A 581 017, JP-Y 53-51 181, JP-A 59- 137 822, US-B 65 95 069, US-A 56 64 315, US-A 52 80 727 or US-A 43 29 879 shown, usually open-pored, esp. Metallic, embedded support body.
  • the support bodies are each housed in the lumen of the measuring tube and with this aligned and completely enclosed by the insulating material at least on the fluid-contacting inside.
  • Flowmeter further includes a support frame for holding the measuring tube and for holding a mechanically connected to the transducer electronics housing, which serves to accommodate the above-mentioned excitation and evaluation electronics close to the transducer and protected from environmental influences largely protected.
  • Measuring tube and support frame are fixed to each other only along the inlet side and outlet side along a comparatively narrow connection area.
  • Flowmeters of the type shown in US-A 42 53 340 are characterized i.a. characterized in that they can be made very compact.
  • Magnetic circuit For guiding and coupling the magnetic field in the measuring volume comprises Magnetic circuit usually two coil cores made of magnetically conductive material, which are especially along a circumference of the measuring tube diametrically, spaced apart and each with a free end-side end face, esp. Mirror image, arranged to each other.
  • the magnetic field is coupled into the coil cores by means of a coil arrangement connected to the exciter electronics so that it passes through the fluid flowing between the two end faces at least in sections perpendicular to the flow direction.
  • each of the coil cores is usually additionally magnetically coupled with at least one, one-piece or multi-piece, separate inference giving field conducting element of magnetically conductive material.
  • the Feldleit element extends peripherally to the measuring tube, thus leading the magnetic field around the measuring tube outside.
  • this can be connected, for example, by means of screw and wall screws, as suggested in WO-A 04/072590, to the respective end of the coil core by means of clamping connections.
  • a disadvantage of such a structure is on the one hand to look at the relatively high number of items for a single transducer, which is at the expense of the shortest possible assembly time at the same time required high product quality.
  • it is of particular interest in transducers of the type described not only to precisely position the field coils during assembly of the transducer, but also to ensure that their mounted position to maintain the accuracy over the entire operating time of the respective Meßaufillons within very narrow limits remains unchanged as possible.
  • this is not readily available when using trained as separate items coil cores and possibly equally separate pole pieces or to ensure only with considerable material and assembly costs, for example by means of special stops or other additional locking devices for the field coils, coil cores, and the> pole pieces.
  • the magnetic field system should be as easy to assemble and also be of high long-term stability.
  • the invention consists in a magnetic-inductive transducer for a fluid flowing in a pipeline, which is a measuring tube for Guiding the fluid, a measuring electrode arrangement for detecting electrical voltages generated in the flowing fluid, and a magnetic field system attached to the measuring tube for generating a measuring tube and guided therein fluid in operation at least partially penetrating magnetic field, wherein the magnetic field system at least one In operation, at least at times by an electric excitation current has passed through field coil.
  • the measuring transducer according to the invention further comprises a holder for holding the at least one field coil on the outside of the measuring tube coil holder, wherein the measuring tube and coil holder are connected together without joints, so that the coil holder is formed as an integral part of the measuring tube.
  • Coil holder is made of a magnetically conductive material. According to a development, the coil holder is designed as a magnetic field leading coil core of the field coil.
  • Coil holder has at least one eddy currents reducing or avoiding air gap.
  • the at least one provided in the coil holder air gap is formed so that it is substantially perpendicular to a longitudinal axis of the measuring tube.
  • the coil holder a plurality of eddy currents reducing or avoiding, esp. To each other substantially parallel extending, air gaps.
  • the air gaps may be formed, for example, as an annular gap substantially coaxial with each other.
  • the at least one coil holder by means of a plurality of connected to the measuring tube, esp. Rod, sleeve or lamellar, projections is formed.
  • the coil holder forming projections may be laterally spaced apart to form, in particular. As air gaps formed, spaces.
  • the transducer further in a transition region between the coil holder and measuring tube on a magnetic field focusing pole piece.
  • a transition region between the coil holder and measuring tube on a magnetic field focusing pole piece.
  • Magnetic field system further comprises at least one magnetic field outside around the measuring tube around leading, self-contained field guide.
  • the at least one coil holder is also connected without joints to the at least one field-guiding element.
  • the measuring tube has a first flange at an inlet end and a second flange at an outlet end.
  • each of the two flanges is also jointless connected to the measuring tube.
  • the magnetic field system two at least temporarily by an electrical excitation current flowing through it, esp. Essentially identically constructed, field coils. Therefore, the sensor according to a fifth embodiment of the invention comprises a first coil holder serving to support a first field coil of the magnetic field system on the outside of the measuring tube and a second coil holder serving to support a second field coil of the magnetic field system on the outside of the measuring tube.
  • each of the two esp. Essentially identically constructed, coil holders formed as an integral part of the measuring tube and each joint-free connected to the measuring tube.
  • the measuring tube comprises a, esp. Metallic, support tube, which carries the outside of the coil holder.
  • a liner of electrically insulating material esp. A plastic.
  • the support tube and the coil holder made of a cast metal, esp. A cast iron, and exist that the support tube and the> the coil holder made of a sintered metal and that the carrier tube and the coil holder consist of the same, in particular magnetically conductive, material.
  • the support tube has a first flange at an inlet end and a second flange at an outlet end.
  • Each of the two flanges can in turn be jointlessly connected to the support tube and are made of the same material as the carrier ear.
  • a basic idea of the invention is to provide a mounting-friendly, esp. Fast as well as equally precise mountable magnetic field system for magnetic-inductive transducers, characterized in that the actual measuring tube corresponding coil brackets are attached, already in the formation of the measuring tube or of the carrier tube, if used, for example, by casting or sintering, as an integral part thereof.
  • this idea can be further developed in an advantageous manner, that equally the at least one field guide element joins joint-free with the at least one coil holder and is designed as an integral part thereof.
  • An advantage of the invention is that the magnetic field system is easier to install compared to those of conventional sensors of the type described on the one hand due to the reduction in the number of individual components.
  • total potential coupling points are reduced magnetic stray fields.
  • a further advantage of the invention is further to be seen in the fact that due to the now very extensive automation of the production of the magnetic field system scatter individual copies within a production lot as well as practically on the product line in lower tolerance ranges. Equally, thus temporal variances of the magnetic field system, esp. Due to slight slippage of the field coils and the return of the field-leading elements, and associated variations in the measurement accuracy can be significantly reduced.
  • Fig. La, b show schematically a magnetic-inductive transducer
  • Fig. 2a, b show schematically a measuring tube and provided thereon
  • FIG. Ia, b, c, Fig. 3 shows schematically a further variant of a
  • Fig. 4a, b show schematically an embodiment of a winding body of a magneto-inductive transducer provided for field coil.
  • Fig. Ia, b, c show schematically a measurement of a flowing fluid in a pipe serving magnetic-inductive transducer.
  • the transducer can be used, for example, as a primary transducer in-line flow meter and for conductivity measurement.
  • the measuring transducer comprises an at least partially housed in a transducer housing 100 measuring tube 1 of predeterminable shape and size for guiding the fluid to be measured, arranged on the measuring tube 1 magnetic field system 2 for generating and guiding a required for the measurement, the guided in the measuring tube fluid partially passing magnetic field and a likewise arranged on the measuring tube 1 measuring electrode assembly 3 for measuring a voltage induced in the fluid.
  • the magnetic field system is designed so that the magnetic field generated therewith passes through the fluid located within the measuring tube at least in sections perpendicular to its flow direction.
  • Electrode arrangement 3 two - here rod-shaped galvanic - measuring electrodes 31, 32.
  • the measuring electrodes 31, 32 here, as shown schematically in Fig. 2c and d, respectively, the fluid in operation contacting Meßelektroden- head for tapping the induced voltage mentioned above and a Meßelektroden- shaft, which serves to connect the sensor assembly to a - not shown here - evaluation electronics of said in-line meter.
  • the two measuring electrodes as seen from the synopsis of Fig. 2a, b, c, d, diametrically opposite each other. Of course, they can also, if necessary, esp.
  • measuring tube 1 When using more than two measuring electrodes on the measuring tube 1 are spaced from each other so that they are not diametrically opposed. This can be the case, for example, if additional measuring electrodes for reference potentials or horizontal mounting position of the measuring tube 1 measuring electrodes for monitoring a minimum level of the fluid in the measuring tube 1 are provided.
  • additional measuring electrodes for reference potentials or horizontal mounting position of the measuring tube 1 measuring electrodes for monitoring a minimum level of the fluid in the measuring tube 1 are provided.
  • galvanic measuring electrodes 31, 32 shown here it is also possible to use capacitive measuring electrodes.
  • the measuring transducer further comprises a magnetic field system 2 attached to the measuring tube 1 with at least one field coil 21.
  • the at least one field coil 21 is connected to a - not shown here - exciter electronics of the in-line measuring device and at least temporarily flowed through by one of them supplied excitation current.
  • the circuit arrangements known to the person skilled in the art or described in the prior art can be used as excitation electronics.
  • the at least one as is apparent from the synopsis of Fig. Ib and Ic, here substantially cylindrical field coil formed by at least one on a substantially sleeve-like, esp. Tubular, winding body 211 wound coil wire.
  • the magnetic field system 2 comprises two field coils 21, 22 which are substantially diametrically opposed to each other and at least temporarily in operation by one, for example the same, electrical excitation current are flowed through.
  • Each of the two in particular essentially identical field coils 21, 22 is, as can also be seen in FIG. 1c, respectively formed by means of a winding body 211, 221, here essentially sleeve-like or cylindrical, onto which a respective coil wire is wound.
  • the transducer For holding the at least one field coil 21 outside the measuring tube 1, the transducer, as, inter alia, from the Fig, Ic, further arranged on the outside of the measuring tube, through a - here by means of the sleeve-shaped winding body 211 formed - central opening of the field coil 21st extending therethrough - here substantially cylindrically shaped - coil mount 23, which can be regarded as a component of the magnet system so far.
  • the field coil 21 is pushed or attached to the coil holder 23 accordingly, so that the latter in Operation is flooded by the within the field coil 21 substantially parallel field lines of the magnetic field.
  • the coil holder 23 itself may also be designed as a coil core for the field coil 21 that conducts the magnetic field and, to that extent, increases the inductance of the field coil 21.
  • the coil holder 23 according to a further embodiment of the invention of a magnetically conductive material having a relative permeability of substantially greater than one, esp. Greater than 10. It is further provided that the measuring tube 1 at least partially consists of a magnetically conductive material.
  • the magnetic field system 2 further comprises at least one of magnetically conductive material existing, with the least one field coil 21 possible low-loss magnetically coupled field-guiding element 25 for guiding the magnetic field outside of the measuring tube.
  • the magnetic yoke-giving Feldleit- element 25 may be formed as a self-contained band and £> of substantially annular.
  • the at least one Feldleit element can be made, for example, as a single one-piece punched or stamped / bent part of transformer or dynamo sheet.
  • at least one Feldleit element but also be formed as a one-piece casting.
  • the at least one field-conducting element 25 made of, for example, ferro-magnetic metal is arranged by means of a sheet-metal ring extending peripherally to the measuring tube 1, in particular coaxially with the measuring tube, and formed, which contacts the coil holder 23 at its distal end to the measuring tube and the self with the coil holder 23, esp. Again releasably connected.
  • the magnetic field system 2 may include, in addition to the at least one field-conducting element 25 if necessary, further field-guiding elements.
  • At least one field-guiding element 25 not as a single sheet metal part, but for the purpose of suppression of eddy currents as a package of several, electrically insulated from each other layered sheet metal parts form, see. also JP-Y 2-28 406, US-A 46 41 537 or WO-A 04/072590.
  • Coil holder 23 for the at least one field coil 21 as an integral part of Measuring tube 1 is formed.
  • measuring tube 1 and coil holder 23 are connected without any joints, esp. Also free of additional welds and solder joints.
  • a coil holder integrated in the measuring tube in this way it can be cast or sintered, for example, together with the measuring tube - in toto or at least in the parts abutting directly within a transition region.
  • melts made of magnetically conductive plastic or metal or sinterable and> the fusible granules and>> the powder serve as a sintered material such as sinterable metals and> the metal oxides or other suitable ceramic materials can be used.
  • the Polschuh forming thickening or depression can equally be formed directly in the production of coil holder and measuring tube, so that the pole piece so far joint-free connected with measuring tube and coil holder and insofar as the coil holder itself is also formed as an integral part of the measuring tube.
  • the coil holder 23 at least one eddy currents reducing or avoiding, esp. Substantially perpendicular to a longitudinal axis of the measuring tube 1 extending, air gap 23 'has. If necessary, the coil holder 23 can of course also, as can be seen from Figures 1c or 2a, b, c, a plurality of eddy currents reducing or avoiding, esp. To each other substantially parallel extending, air gaps have.
  • the air gaps can be formed, for example, as an annular gap substantially coaxial with each other. This can for example be realized in that the at least one coil holder 23 by means of a plurality of connected to the measuring tube, esp.
  • an embedded, esp. Open-pored and the tubular, supporting body can be provided.
  • the support tube 11 coaxially surrounds the liner 12 with possibly embedded support body and thus serves as an outer shaping and shape-stabilizing enclosure measuring tube 1.
  • the liner 12 is designed so that the measuring tube is completely covered by the liner 12 on an inside contacting the fluid flowing through and thus practically alone, the liner 12 is wetted by flowing through the measuring tube 1 fluid, see. This may also be the US-A 32 13 685.
  • the support tube 11 itself may be contacted by the material of the liner.
  • the coil holder 23 is accordingly arranged on the outside of the latter.
  • carrier tube 11 and coil holder 23 consist of the same, esp. Magnetically conductive, material.
  • the support tube 11 and to that extent the coil holder 23 for the at least one field coil 21 may for example consist of a magnetically conductive material, such as steel or another metal.
  • the support tube 11 at least partially made of a cast metal, esp. A cast iron, and £> at least partially made of a sintered metal.
  • the coil holder 23 for the at least one field coil 21 consists at least partially of a cast metal, esp. A cast iron, and at least partially of a sintered metal.
  • a cast metal esp. A cast iron
  • flanges 4, 5 are provided on the measuring tube 1, these can then also be connected without joints with the support tube 11 in an advantageous manner.
  • carrier tube 11, coil holder 23 and flanges 4, 5 equally at least partially each consist of the same, esp. Cast or sintered material.
  • any other for assembly and the operation of the transducer required and placed on the measuring tube 1 components such as mounting aids, brackets or stops for other attachments of the transducer, in the same way as the at least to form a coil holder 23 as an integral part of the measuring tube and equally free of joints to the measuring tube 1, esp.
  • the possibly present carrier ear 11 to form any other for assembly and the operation of the transducer required and placed on the measuring tube 1 components, such as mounting aids, brackets or stops for other attachments of the transducer, in the same way as the at least to form a coil holder 23 as an integral part of the measuring tube and equally free of joints to the measuring tube 1, esp.
  • the possibly present carrier ear 11 to form any other for assembly and the operation of the transducer required and placed on the measuring tube 1 components, such as mounting aids, brackets or stops for other attachments of the transducer, in the same way as the at least to form a coil holder 23 as an integral part of the measuring tube and equally free of joints to the measuring tube 1, esp
  • the magnetic field system usually two at least temporarily provided by an electrical excitation current, esp. Essentially identical, field coils are provided, the transducer according to a corresponding development of the invention in addition to the holders field coil 21 outside the measuring tube. 1 Serving coil holder 23, a further, the holders of a second field coil 22 outside the measuring tube 1 serving coil holder 24.
  • a diameter of the measuring tube 1 connecting the two measuring electrodes extends substantially perpendicular to a diameter of the measuring tube connecting the field coils 21, 22 and their associated coil holders 23, 24 1.
  • a corresponding with the coil holder 24 for the field coil 22 further, esp. in the same way as the pole piece 27 trained, pole piece may be provided in the transducer.
  • the winding body 211, 221 and insofar as the respective thereof carried field coils 21, 22 on the measuring tube 1 can be provided in the magnetic field system 2 further corresponding clamping and £> the holding devices.
  • This can also, esp.
  • the at least one Feldleitelement 25, the coil brackets and the winding body be adjusted so matched that the two field coils 21, 22 are held pressed at least partially by means of at least one Feldleit- element against the measuring tube.
  • the at least one Feldleit element 25 in this case form so that it rests in the installed state of the magnetic field system simultaneously on the contacted end face as well as on a corresponding possibly also lateral support surface of the respective winding body and this so against the measuring tube 10th kept pressed down, at least in sections elastically stretched.
  • the at least one field-conducting element 25 is at least partially permanently elastically stretched and thus permanently exposed to such mechanical stresses that it is permanently held elastically deformed with respect to an initial state.
  • the at least one coil holder 23 is also connected to the at least one field guide element 25 without joints
  • Meßauf choirs thus the measuring tube together with the at least a coil holder and the at least one field-guiding element can be produced in an advantageous manner as a single casting.
  • the setting of the at least one field coil 21, in particular in this embodiment of the invention for example, be carried out in a simple manner that the at least one winding body 211, as shown schematically in Fig. 4a, consists of at least two partial bodies 21 Ia, 21 Ib, the first directly be placed together on the bobbin holder accordingly.
  • the coil wire in turn can then be subsequently applied, for example, to the in-situ composite winding body, that the coil wire initially fixed in sections on the winding body and last then, as shown schematically in Fig. 4b, is rotated by an external electric motor driven friction wheel, about its running surface is brought into contact with a peripheral portion of the winding body, and as a result, the reel wire is wound up accordingly.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

Le capteur de mesure comprend un tube de mesurage (1) servant à introduire le fluide, un ensemble d'électrodes de mesurage (3) pour détecter les tensions électriques générées dans le fluide qui s'écoule ainsi qu'un système de champ magnétique (2) attaché à l'extérieur au tube de mesurage pour produire un champ magnétique traversant au moins partiellement le tube de mesurage ainsi que le fluide introduit dedans pendant le fonctionnement, qui induit un champ électrique dans le fluide qui s'écoule, sachant que le système à champ magnétique présente pour le moins une bobine de champ (21) traversée au moins temporairement pendant le fonctionnement par un courant d'excitation électrique. Le capteur de mesure selon l'invention comprend d'autre part un support de bobines (24) servant à supporter au moins une bobine de champ à l'extérieur d'un tube de mesurage, sachant que le tube de mesurage et le support de bobines sont reliés ensemble sans jointures, de telle manière que le support de bobines est configuré comme un composant intégral du tube de mesurage.
EP07728065A 2006-04-27 2007-04-27 Capteur de mesure à induction magnétique Ceased EP2010869A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200610020265 DE102006020265A1 (de) 2006-04-27 2006-04-27 Magnetisch-induktiver Meßaufnehmer
DE102006047781 2006-10-06
PCT/EP2007/053598 WO2007125018A1 (fr) 2006-04-27 2007-04-27 Capteur de mesure à induction magnétique

Publications (1)

Publication Number Publication Date
EP2010869A1 true EP2010869A1 (fr) 2009-01-07

Family

ID=38229811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07728065A Ceased EP2010869A1 (fr) 2006-04-27 2007-04-27 Capteur de mesure à induction magnétique

Country Status (4)

Country Link
US (1) US7908932B2 (fr)
EP (1) EP2010869A1 (fr)
RU (1) RU2411454C2 (fr)
WO (1) WO2007125018A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP5385064B2 (ja) * 2009-09-09 2014-01-08 アズビル株式会社 電磁流量計
DE102010001393A1 (de) * 2010-01-29 2011-08-04 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102011009062A1 (de) 2011-01-20 2012-07-26 Krohne Ag Magnetkreisvorrichtung für ein magnetisch-induktives Durchflussmessgerät
DE102013109993A1 (de) * 2013-09-11 2015-03-12 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät, Spulenkern und Feldspule
TWI625507B (zh) * 2015-10-08 2018-06-01 壓電股份有限公司 柯氏力式質量流量計
DE102017115156B4 (de) * 2017-07-06 2022-03-03 Endress+Hauser Flowtec Ag Verfahren zum Herstellen einer Spulenhalterung eines magnetisch-induktiven Durchflussmessgeräts und ein magnetisch-induktives Durchflussmessgerät
US11365995B2 (en) * 2018-09-28 2022-06-21 Georg Fischer Signet Llc Magnetic flowmeter including auxiliary electrodes upstream and downstream of the pair of measuring electrodes and an adjustable brace
CN117122759B (zh) * 2023-09-07 2024-05-03 南京汉科明德医疗科技有限公司 一种磁吸式压力监测装置、体外循环系统及测压方法

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Also Published As

Publication number Publication date
RU2411454C2 (ru) 2011-02-10
WO2007125018A1 (fr) 2007-11-08
US7908932B2 (en) 2011-03-22
US20090308175A1 (en) 2009-12-17
RU2008146767A (ru) 2010-06-10

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