EP4639100A1 - Débitmètre magnéto-inductif - Google Patents

Débitmètre magnéto-inductif

Info

Publication number
EP4639100A1
EP4639100A1 EP23833630.9A EP23833630A EP4639100A1 EP 4639100 A1 EP4639100 A1 EP 4639100A1 EP 23833630 A EP23833630 A EP 23833630A EP 4639100 A1 EP4639100 A1 EP 4639100A1
Authority
EP
European Patent Office
Prior art keywords
measuring
electrode
measuring tube
magnetic
level monitoring
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
EP23833630.9A
Other languages
German (de)
English (en)
Inventor
Oliver Graf
Raphael Hess
Thomas KÜNG
Simon MARIAGER
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 EP4639100A1 publication Critical patent/EP4639100A1/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
    • 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

Definitions

  • the invention relates to a magnetic-inductive flow meter.
  • Magnetic-inductive flow measuring devices are used to determine the flow rate and volume flow of a flowing medium in a pipeline.
  • inline magnetic-inductive flow measuring devices are distinguished from magnetic-inductive flow measuring probes, which are inserted into a side opening of a pipeline.
  • a magnetic-inductive flow measuring device has a magnetic field generating device for generating a magnetic field.
  • a main axis of the magnetic field runs essentially perpendicular to the flow direction of the flowing medium. Saddle or cylinder coils are usually used for this.
  • a magnetic-inductive flow measuring device has a measuring tube for guiding the medium, on the outer surface of which the magnetic field generating device is arranged.
  • a pair of measuring electrodes attached to the surface of the measuring tube picks up an electrical measuring voltage or current perpendicular to the flow direction and the magnetic field.
  • magnetic-inductive flow measuring probes In contrast to a magnetic-inductive flow meter, which comprises a measuring tube for guiding the medium with an attached device for generating a magnetic field penetrating the measuring tube and measuring electrodes, magnetic-inductive flow measuring probes with their usually circular-cylindrical housing are inserted into a side opening of a pipeline and fixed in a fluid-tight manner. A special measuring tube is no longer necessary.
  • the measuring electrode arrangement and coil arrangement on the outer surface of the measuring tube mentioned at the beginning are omitted and are replaced by a device for generating a magnetic field arranged inside the housing and in the immediate vicinity of the measuring electrodes, which is designed in such a way that an axis of symmetry of the magnetic field lines of the generated magnetic field intersects the front surface or the surface between the measuring electrodes perpendicularly.
  • a device for generating a magnetic field arranged inside the housing and in the immediate vicinity of the measuring electrodes, which is designed in such a way that an axis of symmetry of the magnetic field lines of the generated magnetic field intersects the front surface or the surface between the measuring electrodes perpendicularly.
  • Magnetic-inductive flow measuring devices are widely used in process and automation technology for fluids with an electrical conductivity of approximately 5 pS/cm or more. The applicant sells corresponding flow measuring devices in a wide variety of designs for different areas of application, for example under the name PROMAG or MAGPHANT.
  • Magnetic-inductive flowmeters with small nominal diameters suffer from the fact that the measurement inaccuracy increases with a decrease in the conductivity of the medium (less than 10 3 pS/cm).
  • the invention is based on the object of remedying this problem.
  • the magnetic-inductive flow meter according to the invention for determining a flow velocity-dependent measured variable of a flowable medium comprises:
  • a magnetic field generating device for generating a magnetic field penetrating the measuring tube
  • the measuring electrode for tapping a measuring voltage induced in the medium, wherein the measuring electrode is arranged in a measuring electrode opening in the measuring tube, wherein the measuring electrode has a measuring electrode head which is designed to come into contact with the medium,
  • a reference electrode for connecting the medium to a reference potential
  • the reference electrode is arranged in a reference electrode opening in the measuring tube
  • the reference electrode has a reference electrode head which is designed to come into contact with the medium
  • the reference electrode head has a reference electrode diameter D ⁇ fi in a cross-sectional plane A of the measuring tube intersecting the reference electrode and the at least one measuring electrode
  • the measuring electrode head has a measuring electrode diameter D ME in the cross-sectional plane A, characterized in that the reference electrode diameter D ⁇ fi is , in particular at least 10% and preferably at least 25%, smaller than the measuring electrode diameter D ME .
  • the advantage of the solution is that by reducing the reference electrode diameter D RE a significant reduction of the measurement error for media with low conductivity (ie o ⁇ 10 3 fiS/cm) is achieved.
  • a ratio D ME /D RE is greater than 1.3, in particular greater than 1.6 and preferably greater than 2.
  • a minimum distance between the measuring electrode and the reference electrode is greater than 5 millimeters, in particular greater than 7 millimeters and preferably greater than 10 millimeters.
  • the task is also solved by the magnetic-inductive flow meter for determining a flow velocity-dependent measured variable of a flowable medium, comprising:
  • a magnetic field generating device for generating a magnetic field penetrating the measuring tube
  • the measuring electrode for tapping a measuring voltage induced in the medium, wherein the measuring electrode is arranged in a measuring electrode opening in the measuring tube, wherein the measuring electrode has a measuring electrode head which is designed to come into contact with the medium,
  • a level monitoring electrode is arranged in a level monitoring electrode opening of the measuring tube; wherein the level monitoring electrode has a level monitoring electrode head, wherein the level monitoring electrode head is designed to come into contact with the medium, wherein the level monitoring electrode head has a level monitoring electrode diameter D F ü in a cross-sectional plane A of the measuring tube intersecting the level monitoring electrode and the at least one measuring electrode, wherein the measuring electrode head has a measuring electrode diameter D ME in the cross-sectional plane A, characterized in that the level monitoring electrode diameter D FÜ is, in particular at least 10% and preferably at least 25%, smaller than the measuring electrode diameter D ME .
  • a minimum distance d 2 between the measuring electrode and the level monitoring electrode is greater than 5 millimetres, in particular greater than 7 millimetres and preferably greater than 10 millimetres,
  • One embodiment provides that a ratio D ME /D Fii is greater than 1.3, in particular greater than 1.6 and preferably greater than 2.
  • a longitudinal plane intersecting the reference electrode and/or the level monitoring electrode divides the measuring tube into a first measuring tube section and a second measuring tube section, wherein two measuring electrodes are arranged in the first measuring tube section, wherein the two measuring electrodes span a central angle a of 30 ⁇ a ⁇ 60°, in particular 40 ⁇ a ⁇ 50°.
  • the measuring tube diameter D MR is less than 80 millimeters, in particular less than 50 millimeters.
  • the measuring electrode and the reference electrode and/or the level monitoring electrode are arranged on the measuring tube in such a way that they are intersected by the common cross-sectional plane A of the measuring tube.
  • Fig. 1 a cross section through a first embodiment of the magnetic inductive flow meter according to the invention
  • Fig. 2 a cross section through a second embodiment of the magnetic inductive flow meter according to the invention.
  • Fig. 3 Measurement data for a conventional magnetic-inductive flow meter and a magnetic-inductive flow meter according to the invention.
  • Fig. 1 shows a cross section through a first embodiment of the magnetic-inductive flow meter 1 according to the invention.
  • the structure and the measuring principle of a magnetic-inductive flow meter 1 are basically known.
  • a flowable medium which has a (minimum) electrical conductivity is passed through a measuring tube 2.
  • the measuring tube 2 comprises a carrier tube 3 which is usually made of steel, ceramic, plastic or glass or at least comprises these.
  • An electrically insulating material is applied to the inner surface of the carrier tube 3.
  • a magnetic field generating device 5 for generating a magnetic field is arranged on the carrier tube 3 in such a way that the magnetic field lines are oriented essentially perpendicular to a longitudinal direction defined by a measuring tube axis of the measuring tube.
  • the magnetic field generating device 5 usually comprises a saddle coil or at least one (cylindrical) coil 6i.
  • a coil core 14i usually extends through a receptacle 15 of the coil 6i.
  • the receptacle 15 is to be understood as the volume which is delimited by the coil wire forming the coil 6i.
  • the receptacle 15 of the coil 6i can thus be formed by a coil holder or by the imaginary enclosed volume. The latter occurs when the coil wire of the coil 6i is wound directly around the coil core 14i.
  • the coil core 14i is made of a magnetically conductive, in particular soft magnetic material.
  • the magnetic field generating device 5 for generating the magnetic field comprises a pole shoe 21 i, which is arranged at one end of the coil core 14 i.
  • the pole shoe 21 i can be a separate component or can be monolithically connected to the coil core 14 i.
  • two diametrically arranged coils 6a, 6b each have a coil core 14a, 14b and a pole shoe 21a, 21 b.
  • the two coil cores 14a, 14b are connected to one another via a field feedback 22.
  • the field feedback 22 connects the opposite sides of the coil cores 14a, 14b to one another.
  • magnetic-inductive flow meters with exactly one coil 6 with exactly one coil core 14 and without field feedback are also known.
  • the coil 6 is connected to an operating circuit 7, which operates the coil 6 with an operating signal.
  • the operating signal can be a voltage with a time-varying profile and is characterized by operating signal parameters, wherein at least one of the operating signal parameters is controllable.
  • the magnetic field built up by the magnetic field generating device 5 is generated by a direct current of alternating polarity clocked by an operating circuit 7. This ensures a stable zero point and makes the measurement insensitive to influences from electrochemical interference.
  • the two coils 6a, 6b can be connected separately to the operating circuit 7 or connected in series or parallel to one another.
  • a device 8 for tapping the induced measuring voltage is arranged on the measuring tube 2.
  • the device 8 for tapping the induced measuring voltage is formed by two measuring electrodes 17a and 17b arranged opposite one another to form a galvanic contact with the medium.
  • magnetic-inductive flow meters are known which have measuring electrodes arranged on the outer wall of the carrier tube 3 which do not come into contact with the medium.
  • the measuring electrodes 17a, 17b are arranged diametrically and form an electrode axis or are cut by a transverse axis which runs perpendicular to the magnetic field lines and the longitudinal axis of the measuring tube 2.
  • devices 8 for tapping the induced measuring voltage which have more than two measuring electrodes are also known.
  • the flow velocity-dependent measured variable can be determined using the measured voltage.
  • the flow velocity-dependent measured variable includes the flow velocity, the volume flow and/or the mass flow of the medium.
  • a measuring circuit 23 is set up to detect the induced measuring voltage applied to the measuring electrodes 17a, 17b, the respective electrical potentials present or a difference between the electrical potentials present, and an evaluation circuit 24 is designed to determine the flow velocity-dependent measured variable.
  • the evaluation circuit 24 can be part of the measuring transducer or the measuring sensor.
  • the measuring electrodes 17a, 17b are usually made of metal.
  • the support tube 3 is often made of an electrically conductive material, such as steel.
  • the inner wall is lined with an insulating material, for example a (plastic) liner 4.
  • an electrode 19, 20, which is ideally mounted at the highest point in the measuring tube 2 serves as a Level monitoring electrode 19 is used to detect partial filling of the measuring tube 1. It is also designed to forward this information to the user and/or to take the level into account when determining the volume flow.
  • a reference electrode 20, which is usually mounted diametrically opposite to the level monitoring electrode 19 or at the lowest point of the measuring tube cross-section, is used to set a controlled electrical potential in the medium.
  • the reference electrode 20 is generally used to connect the flowing medium to an electrical ground potential.
  • the operating circuit 7, controller circuit 10, measuring circuit 23 and evaluation circuit 24 can be part of a single electronic circuit or form individual circuits.
  • the measuring, operating and/or evaluation circuit 7, 23, 24 is set up to carry out the method according to the invention.
  • the operating circuit is set up to generate the operating signal and to provide it to the magnetic field generating device.
  • the measuring circuit is set up to determine the measurement voltage values and to forward them to the evaluation circuit.
  • the evaluation circuit is set up to determine the current zero point and to take this into account for determining the flow velocity-dependent measurement variable.
  • the magnetic-inductive flowmeter has at least one measuring electrode 17 for tapping a measuring voltage induced in the medium.
  • the measuring electrode 17 is arranged in a measuring electrode opening in the measuring tube 2.
  • the measuring electrode 17 has a measuring electrode head 30 and a measuring electrode shaft.
  • the measuring electrode head 30 is designed to come into contact with the medium.
  • the measuring electrode shaft extends through the measuring electrode opening.
  • the measuring electrode head 30 has a measuring electrode diameter D ME in the cross-sectional plane A.
  • the measuring electrode head 30 does not necessarily have to be circular, but can also be elliptical in shape with a longest extension in the longitudinal direction of the measuring tube.
  • the magnetic-inductive flowmeter has a reference electrode 20 for connecting the medium to be conveyed to an electrical reference potential.
  • the reference electrode 20 is arranged in a reference electrode opening in the measuring tube 2. It has a reference electrode head 32, which is designed to come into contact with the medium, and a reference electrode shaft.
  • the reference electrode shaft extends through the reference electrode opening.
  • the reference electrode is arranged in the measuring tube 2 in such a way that a reference electrode longitudinal axis runs parallel to the main field axis of the generated magnetic field.
  • a measuring electrode axis intersecting the measuring electrodes 17a, 17b intersects the reference electrode longitudinal axis perpendicularly.
  • the reference electrode head 32 has a reference electrode diameter D ⁇ fi in a cross-sectional plane A of the measuring tube intersecting the reference electrode and the at least one measuring electrode.
  • the measuring electrode head 30 has a measuring electrode diameter D ME in the same cross-sectional plane A. To reduce the measurement error, it is essential that the diameters are adjusted.
  • the reference electrode diameter D ⁇ fi is, in particular, at least 10% and preferably at least 25% smaller than the measuring electrode diameter D ME . Accordingly, a ratio DME/DRE is greater than 1.3, in particular greater than 1.6 and preferably greater than 2.
  • a ratio R D RE /D MR for which 0.05 ⁇ R ⁇ 0.25, in particular 0.1 ⁇ R ⁇ 0.2 and preferably 0.13 ⁇ R ⁇ 0.17 applies.
  • a minimum distance d r between the measuring electrode 17a or 17b and the reference electrode 20 is required, which is greater than 5 millimeters, in particular greater than 7 millimeters and preferably greater than 10 millimeters.
  • the magnetic-inductive flowmeter 1 shown also has, in addition to the reference electrode 20, a level monitoring electrode 22 which is arranged in a level monitoring electrode opening of the measuring tube 2.
  • a level monitoring electrode 22 which is arranged in a level monitoring electrode opening of the measuring tube 2.
  • magnetic-inductive flowmeters without reference electrodes and magnetic-inductive flowmeters without level monitoring electrodes 22 are also part of the invention.
  • the measuring electrodes 17a, 17b, the reference electrode 20 and the level monitoring electrode 22 are arranged on the measuring tube 2 in such a way that they are intersected by the common cross-sectional plane A of the measuring tube 2.
  • the cross-sectional plane A is a plane of symmetry for the electrodes arranged on the measuring tube 2.
  • the level monitoring electrode 22 has a level monitoring electrode head 34, which is designed to come into contact with the medium when it is guided in the pipe, and a level monitoring electrode shaft which extends in the level monitoring electrode opening.
  • the level monitoring electrode head 34 has a level monitoring electrode diameter D F ü in the cross-sectional plane A of the measuring tube 2.
  • the level monitoring electrode diameter Dgla is in particular at least 10% and preferably at least 25% smaller than the measuring electrode diameter D ME .
  • Fig. 2 shows a cross section through a second embodiment of the magnetic-inductive flow meter 101 according to the invention.
  • the magnetic-inductive flow meter 101 differs from the embodiment of Fig. 1 essentially only in the number of measuring electrodes 107a-d, the positioning in the measuring tube and contact with the measuring circuit 123.
  • a longitudinal plane intersecting the reference electrode 120 and/or the level monitoring electrode 22 divides the measuring tube 2 into a first measuring tube section I and an equally large second measuring tube section II.
  • the first measuring tube section I according to the invention, at least two measuring electrodes 107a, 107b, or as shown in the embodiment shown, exactly two measuring electrodes 107a, 107b are arranged.
  • the second measuring tube section II at least two measuring electrodes 107c, 107d, or as shown in the embodiment shown, exactly two measuring electrodes 107c, 107d, are also arranged according to the invention.
  • the two measuring electrodes 107a, 107b and also the two measuring electrodes 117c, 117d are arranged on the measuring tube in such a way that their respective measuring electrode longitudinal axes span a central angle a of 30 ⁇ a ⁇ 60°, in particular 40 ⁇ a ⁇ 50°.
  • the measuring electrodes of a measuring tube section form a group and are electrically connected or short-circuited to one another.
  • the measuring circuit 123 is therefore not connected separately to the electrodes, but only to one measuring electrode of each group or to an electrically conductive connecting body connecting the at least two measuring electrodes of a group.
  • two further measuring electrodes can be provided, which - also as shown in Fig. 1 - lie on a measuring electrode axis that intersects the main axis of the magnetic field lines perpendicularly.
  • Fig. 3 shows measurement results for a conventional magnetic-inductive flow meter and a magnetic-inductive flow meter according to the invention.
  • the curve X was recorded with a conventional magnetic-inductive flow meter in which the two measuring electrodes, the level monitoring electrode and the reference electrode, each have a circular cross-section and an identical diameter. From a conductivity value of 10 3 pS/cm, the measurement error increases with decreasing conductivity until it reaches a measurement error value of -3.5% at a conductivity of 10 pS/cm.
  • the curve Y was recorded with a magnetic-inductive flow meter according to the invention in which the diameters of the level monitoring electrode and the reference electrode were chosen to be significantly smaller than the diameters of the measuring electrodes.
  • the diameter of the measuring electrodes in the cross section is 8 millimeters and the diameter of the reference electrode and the level monitoring electrode is 4 millimeters.
  • the series of measurements results in a maximum measurement error of approx. -0.8% for the curve Y.
  • the measured errors of the two magnetic-inductive flowmeters differ only insignificantly. LIST OF REFERENCE SYMBOLS magnetic-inductive flow meter 1 measuring tube 2

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

Abstract

L'invention concerne un débitmètre magnéto-inductif (1, 101) pour déterminer une variable de mesure dépendant de la vitesse de flux d'un milieu fluide, ledit débitmètre comprenant : - un tube de mesure (2) pour guider le milieu, - un dispositif de génération de champ magnétique (5) ; - au moins une électrode de mesure (17), l'électrode de mesure (17) étant placée dans une ouverture d'électrode de mesure dans le tube de mesure (2), l'électrode de mesure (17) ayant une tête d'électrode de mesure (30) qui est conçue pour venir en contact avec le milieu, - une électrode de référence (20) pour connecter le milieu à un potentiel de référence, l'électrode de référence (20) étant agencée dans une ouverture d'électrode de référence dans le tube de mesure (2), l'électrode de référence (20) ayant une tête d'électrode de référence (32) qui est conçue pour venir en contact avec le milieu, la tête d'électrode de référence (32) ayant dans un plan transversal A du tube de mesure croisant l'électrode de référence et ladite électrode de mesure, un diamètre d'électrode de référence D RE , la tête d'électrode de mesure (30) ayant, dans le plan transversal A, un diamètre d'électrode de mesure D ME , caractérisé en ce que le diamètre d'électrode de référence D RE est en particulier plus petit d'au moins 10 % et de préférence d'au moins 25 % que le diamètre d'électrode de mesure D ME .
EP23833630.9A 2022-12-20 2023-12-13 Débitmètre magnéto-inductif Pending EP4639100A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022134109.7A DE102022134109A1 (de) 2022-12-20 2022-12-20 Magnetisch-induktives Durchflussmessgerät
PCT/EP2023/085602 WO2024132779A1 (fr) 2022-12-20 2023-12-13 Débitmètre magnéto-inductif

Publications (1)

Publication Number Publication Date
EP4639100A1 true EP4639100A1 (fr) 2025-10-29

Family

ID=89452443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23833630.9A Pending EP4639100A1 (fr) 2022-12-20 2023-12-13 Débitmètre magnéto-inductif

Country Status (5)

Country Link
US (1) US20260219082A1 (fr)
EP (1) EP4639100A1 (fr)
CN (1) CN120344825A (fr)
DE (1) DE102022134109A1 (fr)
WO (1) WO2024132779A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH684806A5 (de) * 1992-12-11 1994-12-30 Schlaepfer Messtechnik Ag Prom Füllgradmessung von leitenden Flüssigkeiten in einem Rohr.
DE10356007B3 (de) * 2003-11-27 2005-07-07 Krohne Meßtechnik GmbH & Co KG Verfahren zum Betreiben eines magnetisch-induktiven Durchflußmeßgeräts
DE102008059067A1 (de) * 2008-11-26 2010-06-02 Krohne Ag Magnetisch-induktives Durchflußmeßgerät
DE102012205122B4 (de) * 2012-03-29 2024-06-20 Robert Bosch Gmbh Kapazitives Ortungsgerät
DE102017105547A1 (de) * 2017-03-15 2018-09-20 Krohne Ag Verfahren zur Bestimmung des Strömungsprofils, Messwertumformer, magnetisch-induktives Durchflussmessgerät und Verwendung eines magnetisch-induktiven Durchflussmessgeräts
DE102018131167A1 (de) * 2018-12-06 2020-06-10 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102018132935A1 (de) * 2018-12-19 2020-06-25 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät und Messstelle

Also Published As

Publication number Publication date
US20260219082A1 (en) 2026-07-30
CN120344825A (zh) 2025-07-18
DE102022134109A1 (de) 2024-06-20
WO2024132779A1 (fr) 2024-06-27

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