EP1915593A1 - Debitmetre a induction magnetique - Google Patents

Debitmetre a induction magnetique

Info

Publication number
EP1915593A1
EP1915593A1 EP06755156A EP06755156A EP1915593A1 EP 1915593 A1 EP1915593 A1 EP 1915593A1 EP 06755156 A EP06755156 A EP 06755156A EP 06755156 A EP06755156 A EP 06755156A EP 1915593 A1 EP1915593 A1 EP 1915593A1
Authority
EP
European Patent Office
Prior art keywords
measuring
temperature
medium
electrodes
electrical conductivity
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Withdrawn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
EP06755156A
Other languages
German (de)
English (en)
Inventor
Thomas Budmiger
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 EP1915593A1 publication Critical patent/EP1915593A1/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Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a device for measuring the flow of a
  • Medium which flows through a measuring tube in the direction of the measuring tube axis, with a magnet assembly which generates a measuring tube passing through and extending substantially perpendicular to the measuring tube axis alternating magnetic field, with two measuring electrodes, which are positioned in the measuring tube on a connecting line, which is substantially perpendicular to the measuring tube axis and is aligned with the magnetic field, optionally with at least one reference electrode and with an evaluation / control unit, which provides information about the volume or mass flow of the medium in the measuring tube based on the measuring voltage induced in the measuring electrodes and the impedance measured between two electrodes determines the electrical conductivity of the medium.
  • Magnetic-inductive flowmeters whose essential components have been previously mentioned, use for the volumetric flow measurement, the principle of electrodynamic induction: vertically to a magnetic field moving charge carriers of the medium induce in equally substantially perpendicular to the flow direction of the medium arranged measuring electrodes a voltage , This measuring voltage induced in the measuring electrodes is proportional to the mean flow velocity of the medium over the cross section of the measuring tube; it is therefore proportional to the volume flow. In the case of a known density of the medium, it is also possible to make a statement about the mass flow of the medium flowing through the measuring tube.
  • the measuring electrodes are either galvanically or capacitively coupled to the medium.
  • Coil current Ideally, the course of the coil current flowing in the coil or the coils of the magnet arrangement corresponds to the course of the magnetic field, since the measuring or field frequency of the magnetic-inductive flowmeter, ie the frequency with which the switching of the alternating magnetic field occurs. highly dependent on the inductance of the coil arrangement.
  • the object of the invention is to propose a magnetic-inductive flowmeter which makes it possible to determine a state variable derived from the resistance between two electrodes with high precision.
  • the object is achieved in that a temperature measuring unit is provided which provides information about the temperature of the medium, and that the control / evaluation unit based on the measured temperature determines a correction value for the electrical conductivity and a correspondingly corrected value for the electrical Provides conductivity.
  • the temperature measuring unit is provided in the region of the magnet arrangement, wherein the temperature measuring unit determines the temperature of the medium indirectly via the measurement of the current flowing through the magnet coil current.
  • the temperature measuring unit is a temperature sensor which is in direct or indirect contact with the medium.
  • the temperature sensor is a PT-100 or a PT-1000.
  • the temperature sensor is attached to the measuring tube.
  • the measured temperature values can thus be measured externally as measured voltage or current signal or digital, e.g. via a fieldbus, via the HART standard or via the Internet to the control evaluation unit.
  • the control / evaluation unit is preferably housed in the transmitter of the magnetic-inductive flowmeter.
  • Device more temperature measuring units, wherein the control / evaluation unit based on the temperature measured values of the temperature measurement units determines the average temperature of the medium.
  • control / evaluation unit controls the measuring electrodes and / or the reference electrode / reference electrodes so that approximately simultaneously a measured value for the flow and for the electrical conductivity is available.
  • control / evaluation unit, the measuring electrodes and / or the reference electrode / reference controls electrodes in such a way that a measured value for the flow rate and for the electrical conductivity is available alternately.
  • control / evaluation unit determines the correction value for the electrical conductivity ⁇ via the Arrhenius equation.
  • the Arrhenius equation is: [0014] ⁇ "f AG ..
  • an advantageous embodiment provides that the reference electrode or the reference electrodes is arranged or arranged in the region above the connecting line of the measuring electrodes and / or in the region below the connecting line of the measuring electrodes.
  • a corresponding embodiment of the magnetic-inductive flowmeters which are offered and distributed by the applicant under the name PROMAG, known for so-called. Empty tube detection.
  • Fig. 1 a schematic representation of a first embodiment of the device according to the invention
  • Fig. 2 a schematic representation of a second embodiment of the device according to the invention.
  • Fig. 1 shows a schematic representation of a first embodiment of the device according to the invention.
  • the measuring tube 2 is flowed through by the medium 11 in the direction of the measuring tube axis 3.
  • the medium 11 is at least to a small extent electrically conductive.
  • the measuring tube 2 itself is made of a non-conductive material, or it is lined at least on its inner surface with a non-conductive material.
  • the magnetic field B aligned perpendicular to the flow direction of the medium 11 is generated via the diametrically arranged magnet arrangement 6, 7 or via two electromagnets. Under the influence of the magnetic field B, charge carriers located in the medium 11 migrate, depending on the polarity, to the two oppositely poled measuring electrodes 4, 5.
  • the voltage building up on the measuring electrodes 4, 5 is proportional to the averaged over the cross section of the measuring tube 2 flow rate of the medium 11, that is, it is a measure of the volume flow of the medium 11 in the measuring tube 2.
  • the measuring tube 2 is incidentally via connecting elements, for. As flanges, which are not shown separately in the drawing, connected to a pipe system through which the medium 11 passes.
  • the measuring electrodes 4, 5 are in direct contact with the medium 11; However, the coupling can, as already mentioned above, also be configured capacitively.
  • connection lines 12, 13, the measuring electrodes 4, 5 are connected to the control / evaluation unit 8.
  • the connection between the magnet arrangement 6, 7 and the control / evaluation unit 8 takes place via the connection lines 14, 15.
  • the evaluation / control unit 8 is associated with the memory unit 10.
  • the impedance measurement for determining the electrical conductivity 6 of the medium 11 takes place between the two measuring electrodes 4, 5. How such a measurement is to be carried out by way of example can be taken from the two aforementioned prior art documents.
  • the temperature measurement takes place in the direct manner:
  • a temperature measuring unit 17 is provided in the upper region of the measuring tube 2.
  • the temperature measuring unit is preferably a PT-100 or a PT-1000.
  • the temperature measuring unit 17 provides information about the temperature T of the medium 11 to the control / evaluation unit 8.
  • the control / evaluation unit 8 provides information about the electrical conductivity 6 of the medium 11 in addition to the flow information. With knowledge of the temperature T of the medium 11 flowing in the measuring tube 2, the control / evaluation unit 8 provides a corrected value for the electrical conductivity 6 of the medium 11.
  • the temperature dependence of the conductivity 6 of the medium 11 is determined, for example, with the aid of the Arrhenius equation.
  • FIG. 2 shows a schematic representation of a second embodiment of the device 1 according to the invention. From the embodiment shown in FIG. 1, this embodiment differs in two features:
  • the impedance measurement for determining the electrical conductivity 6 of the medium 11 takes place between a measuring electrode 4; 5 and the reference electrode 9, which is arranged in the lower region of the measuring tube 2.
  • the reference electrode 9 is connected via the connecting line 16 with the control / evaluation unit 8.
  • the temperature is measured indirectly by determining the by the
  • the temperature T of the medium 11 is reflected.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

L'invention concerne un débitmètre à induction magnétique (1) fournissant des informations concernant la conductibilité électrique (6) du fluide (11) en plus des informations relatives au débit. L'objectif de l'invention est de créer un débitmètre à induction magnétique de ce type qui permette de déterminer la conductibilité électrique avec une grande précision. A cet effet, le débitmètre à induction magnétique (1) selon l'invention est pourvu d'une unité de mesure de température (17) qui fournit des informations concernant la température (T) du fluide (11). A l'aide de la température (T) mesurée, une unité de régulation/évaluation (8) détermine une valeur de correction pour la conductibilité électrique (s(T)) et fournit pour la conductibilité électrique (s) une valeur corrigée au moyen de cette valeur de correction.
EP06755156A 2005-08-17 2006-05-11 Debitmetre a induction magnetique Withdrawn EP1915593A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005039223A DE102005039223A1 (de) 2005-08-17 2005-08-17 Magnetisch-induktive Durchflussmessgerät
PCT/EP2006/062245 WO2007020111A1 (fr) 2005-08-17 2006-05-11 Debitmetre a induction magnetique

Publications (1)

Publication Number Publication Date
EP1915593A1 true EP1915593A1 (fr) 2008-04-30

Family

ID=37004205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06755156A Withdrawn EP1915593A1 (fr) 2005-08-17 2006-05-11 Debitmetre a induction magnetique

Country Status (6)

Country Link
US (1) US7946184B2 (fr)
EP (1) EP1915593A1 (fr)
JP (1) JP2009505085A (fr)
CN (1) CN101287967B (fr)
DE (1) DE102005039223A1 (fr)
WO (1) WO2007020111A1 (fr)

Families Citing this family (12)

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Publication number Priority date Publication date Assignee Title
DE102007007812A1 (de) * 2007-02-16 2008-08-21 Siemens Ag Durchflussmessumformer
DE102007014469A1 (de) * 2007-03-22 2008-09-25 Endress + Hauser Flowtec Ag Verfahren zur vorausschauenden Wartung und/oder Verfahren zur Bestimmung der elektrischen Leitfähigkeit bei einem magnetischinduktiven Durchflussmessgerät
DE102010001993B4 (de) * 2010-02-16 2019-12-19 Ifm Electronic Gmbh Magnetisch-induktives Durchflussmessgerät
CN102221383B (zh) * 2011-03-04 2013-02-27 厦门海旭东方智能科技有限公司 差动磁感应式流量计
US9696188B2 (en) * 2013-03-14 2017-07-04 Rosemount Inc. Magnetic flowmeter with automatic adjustment based on sensed complex impedance
DE102013013991A1 (de) * 2013-07-08 2015-01-08 Krohne Messtechnik Gmbh Magnetisch-induktives Durchflussmessgerät
CN104266696A (zh) * 2014-10-22 2015-01-07 中山欧麦克仪器设备有限公司 一种高精度智能型电磁流量计
US10323969B2 (en) * 2015-08-17 2019-06-18 Scott F Geller Fluid signaling device
DE102016125809A1 (de) 2016-12-28 2018-06-28 Endress+Hauser Flowtec Ag Messanordnung zur Analyse von Eigenschaften eines strömenden Mediums mittels Mikrowellen
DE102018130793B4 (de) * 2018-12-04 2024-01-25 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102019107904B3 (de) * 2019-03-27 2020-08-13 Krohne Messtechnik Gmbh Magnetisch-induktives Durchflussmessgerät mit Leitfähigkeitsmesseinrichtung und Verfahren zum Betreiben eines magnetisch-induktiven Durchflussmessgerätes mit Leitfähigkeitsmesseinrichtung
DE102020200213A1 (de) 2019-12-04 2021-06-10 Siemens Aktiengesellschaft Multifunktionaler Sensor für die Prozessindustrie

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JP2568620B2 (ja) 1988-03-29 1997-01-08 愛知時計電機株式会社 電磁流量計
JPH04340424A (ja) * 1991-05-17 1992-11-26 Yamatake Honeywell Co Ltd 電磁流量計
JPH05256675A (ja) 1992-03-12 1993-10-05 Toshiba Corp 電磁流量計
DE4317366C2 (de) * 1993-05-25 1997-04-17 Ultrakust Electronic Gmbh Verfahren und Vorrichtung zur Bestimmung eines Volumenstromes
JP2002162267A (ja) 2000-11-27 2002-06-07 Shimadzu Corp 電磁流量計
DE10118002B4 (de) * 2001-04-10 2004-12-30 Krohne Meßtechnik GmbH & Co KG Magnetisch-induktives Durchflußmeßverfahren und magnetisch-induktives Durchflußmeßgerät
DE10118001C2 (de) * 2001-04-10 2003-08-28 Krohne Messtechnik Kg Magnetisch-induktives Durchflußmeßgerät und magnetisch-induktives Durchflußmeßverfahren
JP3915459B2 (ja) * 2001-09-20 2007-05-16 横河電機株式会社 電磁流量計
EP1387148A3 (fr) * 2002-08-02 2007-06-20 ABB PATENT GmbH Procédé d' opération d' un système de mesure du débit, ainsi que système de mesure du débit
CN1184483C (zh) * 2002-12-24 2005-01-12 上海大学 集成式浆体浓度流量在线测量方法和***
DE10356007B3 (de) 2003-11-27 2005-07-07 Krohne Meßtechnik GmbH & Co KG Verfahren zum Betreiben eines magnetisch-induktiven Durchflußmeßgeräts
JP2005207755A (ja) 2004-01-20 2005-08-04 Yokogawa Electric Corp 電磁流量計
CN1560569A (zh) * 2004-02-18 2005-01-05 沈阳市传感技术研究所 永磁小口径流量计

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See references of WO2007020111A1 *

Also Published As

Publication number Publication date
US20090205438A1 (en) 2009-08-20
CN101287967B (zh) 2011-08-10
JP2009505085A (ja) 2009-02-05
DE102005039223A1 (de) 2007-02-22
WO2007020111A1 (fr) 2007-02-22
US7946184B2 (en) 2011-05-24
CN101287967A (zh) 2008-10-15

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