EP2761257A1 - Appareil de mesure de débit à induction magnétique - Google Patents

Appareil de mesure de débit à induction magnétique

Info

Publication number
EP2761257A1
EP2761257A1 EP12756135.5A EP12756135A EP2761257A1 EP 2761257 A1 EP2761257 A1 EP 2761257A1 EP 12756135 A EP12756135 A EP 12756135A EP 2761257 A1 EP2761257 A1 EP 2761257A1
Authority
EP
European Patent Office
Prior art keywords
coil
measuring tube
core
core sheet
leg
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Withdrawn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
EP12756135.5A
Other languages
German (de)
English (en)
Inventor
Oliver Graf
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
Application filed by Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP2761257A1 publication Critical patent/EP2761257A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • G01F1/588—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 combined constructions of electrodes, coils or magnetic circuits, accessories therefor
    • 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
    • G01F1/60—Circuits therefor

Definitions

  • the present invention relates to a magnetic-inductive flowmeter with a
  • Measuring tube and arranged thereon coil systems each coil system having a coil and a guided through the coil bobbin, that this protrudes from the coil.
  • Magnetic-inductive flowmeters use the principle of electrodynamic induction for volumetric flow measurement and are made of a variety of
  • Media induce a measuring voltage in substantially perpendicular to the flow direction of the medium and perpendicular to the direction of the magnetic field arranged measuring electrodes.
  • the measuring voltage induced in the measuring electrodes is proportional to the average flow velocity of the medium over the cross section of the measuring tube, ie proportional to the flow rate
  • volume flow If the density of the medium is known, the mass flow in the pipeline or in the measuring tube can be determined.
  • the measuring voltage is usually over
  • Electrodes are usually galvanically coupled to the medium; However, magnetic-inductive flowmeters with non-contact capacitive coupling electrodes are also known.
  • the measuring tube can be made of either an electrically conductive, non-magnetic material, e.g. Stainless steel, be made, or consist of an electrically insulating material. If the measuring tube is made of an electrically conductive material, then it must be lined in the area coming into contact with the medium with a liner made of an electrically insulating material. Depending on the temperature and medium, the liner consists, for example, of a thermoplastic, a duroplastic or an elastomeric plastic. However, magnetic-inductive flow meters with a ceramic lining are also known.
  • An electrode can be substantially in an electrode head, at least partially with a medium, which flows through the measuring tube, in contact, and a
  • Subdivide electrode shaft which is almost completely inserted in the wall of the measuring tube.
  • the electrodes are the central components of a magneto-inductive flowmeter. In the design and arrangement of the electrodes, care must be taken that they can be mounted as simply as possible in the measuring tube and that no leakage problems subsequently occur during measuring operation; In addition, the electrodes should be distinguished by a sensitive and at the same time low-interference measurement signal acquisition. In addition to the measuring electrodes, which serve to tap a measuring signal, additional electrodes in the form of reference or ground electrodes are often installed in the measuring tube, which serve to measure an electrical reference potential or to detect partially filled measuring tubes or to detect the medium temperature by means of built-in temperature sensor.
  • the object of the invention is to propose a simple and inexpensive to manufacture magnetic-inductive flowmeter.
  • Fig. 1 shows an inventive magnetic-inductive flowmeter in the
  • Fig. 3 shows the same inventive magnetic-inductive flowmeter
  • FIG. 4 shows a perspective view of a coil system according to the invention of a magnetic-inductive flowmeter according to the invention
  • FIG. 5 shows the coil system of FIG. 4 in cross-section
  • FIG. 6 shows a pole shoe of a coil system according to the invention in plan view
  • FIG. 7 shows a perspective view of a core sheet according to the invention
  • FIG. 8 shows a perspective view of a retaining clip according to the invention in front and rear view
  • FIG. 9 shows schematically the arrangement of four coils on the measuring tube
  • Fig. 10 exemplifies the interconnection of the four coils.
  • FIG. 1 shows a top view of a magnetic-inductive flowmeter according to the invention with a measuring tube 1 and coil systems 2 arranged thereon.
  • Each coil system 2 has a coil 3 and a coil core 4 guided through the coil 3.
  • the spool core 4 protrudes from at least one end face 11 of the spool 3.
  • the coil core 4 which here comprises a plurality of core sheets, projects symmetrically out of both end faces 11 and 12 of the coil 3.
  • the core sheets are L-shaped and aligned with each other so that in a longitudinal section through the coil system, a U-shaped coil core is formed.
  • Two coil systems 2 are in a line 29 parallel to a longitudinal axis of the
  • Measuring tube arranged on the measuring tube 1 that a pole piece 5 between the from the
  • Coil systems 2 outstanding coil cores 4 and the measuring tube 1 is arranged.
  • the coils 3 comprise, for example, a helical shape on a hollow cylindrical
  • the coil cores 4 touch the pole piece 5.
  • the coil core 4 is U-shaped, and thus arranged on the measuring tube 1 and aligned with the measuring tube 1 in that the opening of the U leads to the measuring tube 1 and thus to the pole piece 5.
  • a development of the invention consists in that the coil cores 4 of the coil systems 2 each comprise at least two, in particular at least three core sheets 6, 7 and 8, in particular at least two, in particular three stacks of a plurality of core sheets 6, 7 and 8 passing through the coil 3 are guided. All core sheets 6, 7 and 8 are then configured identically and thus in particular have the same shape and size.
  • the core sheets 6 are formed in accordance with an embodiment of the invention L-shaped.
  • Each core plate 6 then has a first leg 9 and a second leg 10, which are connected to one another in an L-shaped manner. According to one embodiment of the invention are all
  • Core sheets 6, 7 and 8 configured identically and thus each have the same shape and size.
  • the first and second legs 9 and 10 include, for example, an angle of 90 °. The same applies, of course, then for the second core plate 7, the third core plate 8 or any other core sheet.
  • each core plate 6 holes 13 through which they are bolted together.
  • the bores 13 are arranged according to training symmetrically based on the length of the first leg 9 of the core sheet 6, so that in an oppositely oriented core sheet, the first leg flush with the first leg 9 of the
  • the corners are rounded, for example by radii of size R0.5 to R10, depending on the size of the core sheet. However, not rounded are the two corners of the free end of the second leg 10, which end in the assembled state of the
  • each core plate can, as here, have further bores, here with a rectangular cross section, through which the tensioning straps are carried out, firmly connecting the coil system to the measuring tube.
  • an inventive core sheet comprises a metal having a magnetic permeability ⁇ ⁇ of at least 50, especially at least 1000 to 50000. It consists for example of M165 or M330.
  • at least a first core sheet 6 and a second core sheet 7 are passed through the coil such that the first leg 9 of the first core sheet 6 and the first leg 9 of the second Core sheet 7 parallel to each other and that the second leg 10 of the first core sheet 6 and the second leg 10 of the second core sheet 7 parallel to each other, wherein the second leg 10 of the first core sheet 6 and the second leg 10 of the second core sheet 7 on different sides the coil 3 are arranged.
  • FIGS. 4 and 5 make clear the structure of a coil system according to the invention.
  • electrically insulating spacers 16 may be arranged. These are in particular
  • Plastic rings for example of a glass fiber reinforced thermoplastic such. Polyamide PA66. Spacers 16 are used to the distance of the coil 3 to the second
  • the magnetic inductive flowmeter according to the invention has in particular a size between DN700 and DN2400, in particular between DN1350 and DN2400.
  • coil systems can be produced, for example, for nominal sizes DN700 to DN1200 and DN1350 to DN 2400.
  • Electrically insulating is a material having a resistivity greater than 1 * 10 "10 Qmm 2 / m, in particular greater than 1 * 10 " 15 Omm 2 / m , Both details apply
  • Core sheets 6, 7 and 8 are congruent next to each other, the first leg 9 of the first core sheet 6 and the first leg 9 of the second core sheet 7 are arranged axially offset from one another. As a result, a length of the coil system is parallel to the first
  • the first leg 9 are not congruent. Holes, in particular at least two, but already in the core sheets, since these according to the axial displacement of the core sheets to each other in the
  • Core sheets are arranged. On such a coil system is not discussed in the figures. Analogously, in the case of core sheets guided through the coil in stacks, the first legs 9 of the first core sheets 6 and the first legs 9 of the second core sheets 7 are arranged axially offset from one another. Even with this, different sized coil systems can be realized. Through the already introduced holes 13 in the core sheets 6, 7 and 8, the core sheets 6, 7 and 8 are screwed together by means of screws 14. The holes 13 are in the
  • Core sheets 6, 7 and 8 arranged so that in the assembled state of the coil system 2, the holes 13 of the first core sheet 6 are congruent with the holes 13 of the second core sheet 7, so that the first and the second core sheet 6 and 7 together through the holes 13 screw. Similarly, then the third core plate 8 is screwed, since it is arranged congruent with the first core sheet. This is achieved by the symmetry of the holes 13 with respect to the length of the first leg 9 of each core sheet 6,
  • each core sheet 6, 7 and 8 has a first and a second leg 9 and 10, which are L-shaped interconnected, wherein at least a first core sheet 6 and a second core sheet 7 and a third core sheet 8 are guided through the coil 3, that the first leg 9 of the first core sheet 6 and the first leg 9 of the second core sheet 7 and the first leg 9 of the third core sheet 8 parallel to each other through the coil 3 and that the second leg 10th of the first core sheet 6 and the second leg 10 of the second core sheet 7 and the second leg 10 of the third core sheet
  • Core sheets 6, 7 and 8 and the second leg 10 of the first and third core sheets 6 and 8 and the second leg 10 of the second core sheet 7 form a U-shaped coil core, wherein the second core sheet 7 between the first and third core sheet 6 and 8 is arranged and in particular centrally guided by the coil 3 and wherein the pole piece. 5 between at least the second legs 10 of the first and third core sheets 6 and 8 and the measuring tube 1 is arranged.
  • the spool core 4 is quasi divided into three parts. Close the core sheets 6, 7 and 8 respectively parallel to the longitudinal axis 29 of the coil system 2 and here also parallel to the longitudinal axis 22 of the measuring tube 1 flush, so the pole piece 5 is also between the first legs 9 of the second
  • the pole piece 5 is only touched by the second legs 10 of the first and third core sheets 6 and 8.
  • the core sheets 6, 7 and 8 are guided adjacent to each other in such a number in that they fill at least the width of the opening, in particular the opening in total.
  • the screws 14 are in one embodiment by means of threaded sleeves 15 of the core sheets 6, 7 and 8 electrically and / or magnetically isolated.
  • two opposing threaded sleeves 15 by means of the screw, here from screw 14 and nut 17, so biased against each other, that at least one screw 15 axially shortens by a predetermined amount, at least partially assumes the shape of a bellows.
  • Screw sleeves 15 the contact of the core sheets 6, 7 and 8 with the screws 14.
  • the screw sleeves 15 are designed so that the sum of their lengths in the unmounted state, which are in the assembled state in the core stack, exceeds the thickness of the core sheet stack by a predetermined amount.
  • the predetermined amount is smaller than the maximum axial compression of the threaded sleeves 15, without these being deformed outside of the parameters of the invention.
  • the threaded sleeves 15 are inserted from both sides into the core stack. Their ring-shaped tips touch each other. Now, if a screw 14 is inserted through the screw sleeves 15 and screwed, an axially acting force is passed through the screw head into the screw sleeves 15, which causes at least one of
  • the pole piece 5 has a first width 30 parallel to the longitudinal axis of the measuring tube 1, which is smaller or equal to a distance of the two coils 3 to each other.
  • the pole piece 5 is arranged on the measuring tube 1 and aligned with the coils 3, that the first width 30 in the coil 3 of the two coil systems 2 is located.
  • the two coils 3 face each other so that the pole piece 5 between them, in particular between their two opposing end faces 1 1, is located. The distance between the two coils 3 is thus measured between the two opposite end faces 1 1 of the coils.
  • the pole piece 5 has a second width 31 parallel to the longitudinal axis of the measuring tube 1, which is greater than the distance between the two
  • the pole piece 5 encloses the measuring tube 1 at least partially.
  • the region of the reduced first width 30 of the pole piece 5 extends over the width of the coil core 4, in particular over the entire width of the coil 3, perpendicular to the longitudinal axis 29 of the coil systems 2, which lie on the line of their longitudinal axes 29.
  • the area of the reduced first width 30 of the pole piece 5 is wider than the width of the coil systems 2.
  • the pole piece 5 according to the invention according to FIG. 6 thus has a length and a second width 31.
  • the pole piece 5 has the shape of a simply curved shell. In plan view, projected onto the plane of the drawing, the pole shoe 5, apart from the rounded corners and the recesses 32, has a quasi-rectangular cross-section.
  • the recesses 32 are symmetrical and lead to the first width 30 in the region of the recesses 32. Alternative embodiments are conceivable, for example as a double lobe in plan view.
  • the pole piece 5 has a bore 33 for the passage of an electrode, in particular a medium monitoring electrode or a reference electrode.
  • the magneto-inductive flowmeter is projected into a plane which runs parallel to the measuring tube axis and covers perpendicularly to a further plane in which the measuring tube axis and the longitudinal axes 29 of the coils 3 overlap, according to FIG Embodiment of the invention, excluding the coil cores 4 of the coil 3, the pole piece 5.
  • Coil systems 2 only touched by the second legs of the first and third core sheets or by the second legs of the core sheets of the first and third core sheet stack.
  • an inventive magnetic-inductive element For positioning a coil system 2 on the measuring tube or a plurality of coil systems 2 or even all coil systems 2, an inventive magnetic-inductive
  • Brackets 34 For example, one or more brackets 34.
  • a coil system 2 is positioned on the measuring tube.
  • an additional strap 35th used, which detects the coil system 2 on the measuring tube 1
  • the brackets 34 act only in the assembly phase additionally as a holder for the coil systems 2.
  • two brackets 34 are used per coil system.
  • a headband 34 is shown in perspective in two views. To position four coil systems on the measuring tube, eight retaining clips 34 are used, for example, two for each coil system. Nevertheless, there are eight common parts.
  • the measuring tube 1 of a magnetic-inductive flowmeter according to the invention has in particular a size between DN700 and DN2400, in particular between DN1350 and DN2400.
  • opposing coils 3 are in particular connected so that their polarity with simultaneous excitation is equal to the two opposite end faces 1 1 of the coils 3 of the two coil systems. 2
  • the coils are so connected, that in each case arranged on one side of the measuring tube in a line coils have the same polarity with simultaneous excitation at the two opposite end faces of the coils, and that the polarity with simultaneous excitation at the two opposite end faces of the coils on one half of Measuring tube vice versa is the polarity with simultaneous excitation at the two themselves
  • a magnetic-inductive flow device is inexpensive to manufacture.
  • FIGS. 9 and 10 show a magnetic-inductive flow device with the described position of the coil systems and the interconnection of their coils. Since the coils are identical, their position and interconnection can also be recognized on the schematically sketched terminal lugs for their electrical connection.
  • A stands for the beginning of the winding of a coil and E for the end.
  • SP1, SP2, SP3 and SP4 identify the four coil systems.
  • two further electrodes are provided in the measuring tube wall. The measuring electrodes lie in a line perpendicular to the measuring tube axis in a plane with this and perpendicular to the plane, which is spanned by the longitudinal axes of the coil systems.
  • the other electrodes are, for example, a
  • FIG. 2 shows the magnetic-inductive flowmeter from FIG. 1, which comprises a measuring tube 1 and at least one coil system 2 according to the invention, from the side in a partial section and in a cross section.
  • the coil systems 2 are encapsulated by a housing 23 enclosing them. Nevertheless, the housing 23 has a low overall height - a further advantage of the invention.
  • the housing 23 has a low overall height - a further advantage of the invention.
  • Coil systems 2 a lower height in the radial direction of the measuring tube 1, as flanges 24 of the measuring tube 1. Only a device for connecting a transmitter 26 may protrude beyond.
  • the device 26 also includes bushings for contacting the coil systems and the electrodes.
  • the coil systems 2 are arranged in particular on the measuring tube 1, that the second legs of the core sheets to the measuring tube 1 show. Measuring electrodes 26, a so-called medium monitoring electrode 27 and a reference electrode 28 protrude into the measuring tube 1 of this example.
  • FIG. 3 shows the magnetic-inductive flowmeter with encapsulated coil systems from FIG. 1 and FIG. 2 in perspective.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Appareil de mesure de débit à induction magnétique qui comporte un tube de mesure (1) et des systèmes à bobine (2) situés sur ledit tube, chaque système à bobine (2) comportant une bobine (3) et un noyau (4) introduit dans la bobine (3) de manière telle qu'il fait saillie par rapport à la bobine (3). Selon l'invention, deux systèmes à bobine (2) sont disposés sur le tube de mesure (1), sur une ligne parallèle à l'axe longitudinal du tube de mesure (1), de manière telle qu'un épanouissement polaire (5) est situé entre les noyaux (4) faisant saillie par rapport aux systèmes à bobine (2) et le tube de mesure (1).
EP12756135.5A 2011-09-27 2012-08-16 Appareil de mesure de débit à induction magnétique Withdrawn EP2761257A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011083549A DE102011083549A1 (de) 2011-09-27 2011-09-27 Magnetisch-induktives Durchflussmessgerät
PCT/EP2012/066040 WO2013045171A1 (fr) 2011-09-27 2012-08-16 Appareil de mesure de débit à induction magnétique

Publications (1)

Publication Number Publication Date
EP2761257A1 true EP2761257A1 (fr) 2014-08-06

Family

ID=46801456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12756135.5A Withdrawn EP2761257A1 (fr) 2011-09-27 2012-08-16 Appareil de mesure de débit à induction magnétique

Country Status (5)

Country Link
US (1) US9360356B2 (fr)
EP (1) EP2761257A1 (fr)
CN (1) CN103827639B (fr)
DE (1) DE102011083549A1 (fr)
WO (1) WO2013045171A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011083550A1 (de) * 2011-09-27 2013-03-28 Endress + Hauser Flowtec Ag Schraubhülse
DE102011083549A1 (de) * 2011-09-27 2013-03-28 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102014113409A1 (de) * 2014-09-17 2016-03-17 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät mit einem Magnetsystem mit mindestens vier Spulen
DE102014113843A1 (de) * 2014-09-24 2016-03-24 Endress+Hauser Flowtec Ag Messrohr für ein Durchflussmessgerät und ein magnetisch-induktives Durchflussmessgerät
DE102015116672A1 (de) * 2015-01-05 2016-07-07 Krohne Ag Durchflussmessgerät
DE102015113390B4 (de) * 2015-08-13 2022-09-08 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät zur Ermittlung des Vorliegens eines vollausgebildeten rotationssymmetrischen Strömungsprofils
DE102017121155A1 (de) 2017-09-13 2019-03-14 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102019123413A1 (de) * 2019-09-02 2021-03-04 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
GB2588201B (en) * 2019-10-15 2024-08-14 Flodatix Ltd Apparatus for monitoring fluid flow in a pipe using electromagnetic velocity tomography
DE102019134599A1 (de) * 2019-12-16 2021-06-17 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät

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US2741121A (en) * 1952-06-17 1956-04-10 Vitro Corp Of America Means for minimizing electrostatic voltages in a flowmeter
DE1772087U (de) * 1956-09-28 1958-08-14 Siemens Ag Ein- oder mehrfenstriger eisenkern fuer transformatoren, wandler od. dgl.
US3191436A (en) 1961-12-27 1965-06-29 North American Aviation Inc Electromagnetic flowmeter
DE1772087A1 (de) 1968-03-28 1971-01-21 Agfa Gevaert Ag Unterwassergehaeuse
US4899592A (en) * 1985-06-06 1990-02-13 The Dow Chemical Company Flat linear flowmeter
EP0309932B1 (fr) 1987-10-01 1992-04-15 Endress + Hauser Flowtec AG Débitmètre électromagnétique
ES2101404T3 (es) * 1993-10-14 1997-07-01 Flowtec Ag Detectores de flujo magnetico-inductivos.
DE10322082A1 (de) 2003-05-15 2004-12-02 Endress + Hauser Flowtec Ag, Reinach Magnetisch-induktiver Durchflußaufnehmer
US6983661B2 (en) * 2003-05-15 2006-01-10 Endress + Hauser Flowtec Ag Electromagnetic flow sensor
DE102004063020B4 (de) * 2004-12-22 2007-10-18 Krohne Ag Magnetisch-induktives Durchflußmeßgerät
US7363811B2 (en) * 2005-04-07 2008-04-29 Endress + Hauser Flowtec Ag Measurement pickup
DE102011083549A1 (de) * 2011-09-27 2013-03-28 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102011083548A1 (de) * 2011-09-27 2013-03-28 Endress + Hauser Flowtec Ag Spulensystem eines magnetisch-induktives Durchflussmessgerät

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DE2120287A1 (de) * 1970-05-08 1971-11-18 Thorn Automation Ltd Spule mit einem Kern

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See also references of WO2013045171A1 *

Also Published As

Publication number Publication date
WO2013045171A1 (fr) 2013-04-04
DE102011083549A1 (de) 2013-03-28
CN103827639B (zh) 2016-06-15
CN103827639A (zh) 2014-05-28
US20140230565A1 (en) 2014-08-21
US9360356B2 (en) 2016-06-07

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