DE102006014679A1 - Magnetic-inductive flow meter for volumetric medium flow measurement, has two sets of measuring electrodes positioned and moved with respect to each other in direction of measuring pipe axis, and circuit summing induced measuring voltages - Google Patents
Magnetic-inductive flow meter for volumetric medium flow measurement, has two sets of measuring electrodes positioned and moved with respect to each other in direction of measuring pipe axis, and circuit summing induced measuring voltages Download PDFInfo
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- DE102006014679A1 DE102006014679A1 DE200610014679 DE102006014679A DE102006014679A1 DE 102006014679 A1 DE102006014679 A1 DE 102006014679A1 DE 200610014679 DE200610014679 DE 200610014679 DE 102006014679 A DE102006014679 A DE 102006014679A DE 102006014679 A1 DE102006014679 A1 DE 102006014679A1
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- 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
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- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Die Erfindung betrifft ein magnetisch-induktives Durchflussmessgerät.The The invention relates to a magnetic-inductive flowmeter.
Magnetisch-induktive Durchflussmessgeräte nutzen für die volumetrische Strömungsmessung das Prinzip der elektrodynamischen Induktion aus: Senkrecht zu einem Magnetfeld bewegte Ladungsträger des Mediums induzieren in gleichfalls im wesentlichen senkrecht zur Durchflussrichtung des Mediums angeordnete Messelektroden eine Messspannung. Diese in die Messelektroden induzierte Messspannung ist proportional zu der über den Querschnitt des Rohres gemittelten Strömungsgeschwindigkeit des Mediums; sie ist also proportional zum Volumenstrom. Die Messspannung wird üblicherweise über ein Messelektrodenpaar abgegriffen, das in dem Bereich des Messrohres angeordnet ist, wo die maximale Magnetfeldstärke herrscht und wo folglich die maximale Messspannung zu erwarten ist. Die Messelektroden sind mit dem Medium entweder galvanisch oder kapazitiv gekoppelt.Electromagnetic Use flowmeters for the volumetric flow measurement the principle of electrodynamic induction from: perpendicular to one Magnetic field moving charge carriers of the In addition, mediums induce substantially perpendicular to Flow direction of the medium arranged measuring electrodes a measuring voltage. These measuring voltage induced in the measuring electrodes is proportional to the over the average flow rate of the medium over the cross section of the tube; it is therefore proportional to the volume flow. The measuring voltage is usually over Measuring electrode pair tapped in the area of the measuring tube is arranged where the maximum magnetic field strength prevails and where consequently the maximum measuring voltage is to be expected. The measuring electrodes are coupled to the medium either galvanically or capacitively.
Probleme hinsichtlich der Messempfindlichkeit eines magnetisch-induktiven Durchflussmessgeräts zeigen sich, wenn das Medium mit Partikeln beladen ist und/oder wenn die Strömungsgeschwindigkeit des Mediums in dem Messrohr relativ klein ist. Prallen Partikel auf die Messelektroden, so erzeugen sie Störimpulse, die sich als Rauschen dem eigentlichen Messsignal überlagern. Im Falle kleiner Strömungsgeschwindigkeiten sind die Messsignale per se relativ klein. Treten dann noch zusätzlich Störsignale auf, so ist der Volumenstrom überhaupt nicht mehr oder nur noch mit einem relativ großen Messfehler bestimmbar.issues with regard to the measuring sensitivity of a magnetic-inductive Flowmeter show up when the medium is loaded with particles and / or when the flow speed of the medium in the measuring tube is relatively small. Bouncing particles on the measuring electrodes, they generate glitches that turn out to be noise overlay the actual measurement signal. In case of low flow rates the measurement signals per se are relatively small. Then occur in addition to interference on, so is the flow rate at all no longer or only with a relatively large measurement error determinable.
Der Erfindung liegt die Aufgabe zugrunde, ein magnetisch-induktives Durchflussmessgerät vorzuschlagen, das in hohem Maße unempfindlich gegenüber Störsignalen ist.Of the Invention is based on the object, a magnetic-inductive Flowmeter to propose, to a large extent insensitive to noise is.
Die Aufgabe wird durch ein Messgerät gelöst, das folgende Komponenten aufweist:
- – Ein Messrohr, das von einem Medium im wesentlichen in Richtung der Messrohrachse durchflossen wird;
- – Eine Magnetanordnung, die ein das Messrohr durchsetzendes und im wesentlichen senkrecht zur Messrohrachse verlaufendes, alternierendes Magnetfeld erzeugt;
- – Zumindest zwei Messelektrodenpaare mit jeweils einer ersten Messelektrode und mit einer zweiten Messelektrode, wobei die erste Messelektrode und die zweite Messelektrode eines jeden Messelektrodenpaares entweder auf einer Verbindungslinie angeordnet sind, die senkrecht zur Messrohrachse und senkrecht zum Magnetfeld ausgerichtet ist, oder die in Richtung der Messrohrachse zueinander versetzt zueinander positioniert sind. Die Messelektroden sind übrigens so ausgestaltet, dass sie mit dem Medium kapazitiv oder galvanisch koppeln.
- – Eine Schaltung, welche die an den Messelektrodenpaaren abgegriffenen induzierten Messspannungen summiert. Bevorzugt handelt es sich bei der Schaltung um eine Serienschaltung, welche die an den Messelektrodenpaaren abgegriffenen induzierten Messspannungen addiert.
- – Eine Regel-/Auswerteeinheit, die anhand der mittels der Schaltung gebildeten Summenspannung den Volumen- und/oder den Massedurchfluss des Mediums durch das Messrohr bestimmt.
- - A measuring tube, which is traversed by a medium substantially in the direction of the measuring tube axis;
- A magnet arrangement which generates an alternating magnetic field passing through the measuring tube and running substantially perpendicular to the measuring tube axis;
- - At least two pairs of measuring electrodes each having a first measuring electrode and a second measuring electrode, wherein the first measuring electrode and the second measuring electrode of each measuring electrode pair are arranged either on a connecting line which is perpendicular to the measuring tube axis and perpendicular to the magnetic field, or in the direction of the measuring tube axis are mutually offset from each other. Incidentally, the measuring electrodes are designed in such a way that they capacitively or galvanically couple with the medium.
- A circuit which sums the induced measuring voltages tapped at the measuring electrode pairs. The circuit is preferably a series circuit which adds the induced measured voltages tapped off at the measuring electrode pairs.
- - A control / evaluation unit, which determines the volume and / or mass flow of the medium through the measuring tube based on the sum voltage formed by the circuit.
Mittels der Summenbildung über die Messspannungen, die in die einzelnen Messelektrodenpaare induziert werden, wird bei vergleichbarer Magnetfeld stärke eine erhöhte Messempfindlichkeit des erfindungsgemäßen Durchflussmessgeräts bezüglich eines Durchflussmessgeräts des Standes der Technik erreicht. Da die abgegriffene und zur Bestimmung des Volumenstroms herangezogene Summen-Messspannung quantitativ größer ist als die Messspannung eines Messelektrodenpaares ist, haben Störsignale einen weniger starken Einfluss auf die Messgenauigkeit als im Falle des bekannten Durchflussmessgeräts mit lediglich einem Messelektrodenpaar. Anstatt die induzierte Messspannung mit nur einem Messelektrodenpaar am Ort der größten Magnetfeldstärke zu erfassen, werden mit mehreren zusätzlichen Messelektrodenpaaren Signalspannungen an unterschiedlichen Orten, an denen unterschiedliche Magnetfeldstärken herrschen, erfasst. Die an den Messelektrodenpaaren abgegriffenen Messspannungen werden erfindungsgemäß addiert, so dass die resultierende, zur Bestimmung des Volumenstroms herangezogene Gesamtspannung einerseits größer ist, andererseits aber auch – wie bereits erwähnt – aus Messspannungen besteht, die an verschiedenen Orten abgegriffen werden. Daher haben lokal auftretende Störungen, die z.B. durch Partikel erzeugt werden, die auf eine Messelektrode auftreffen, in der Summe einen kleineren Anteil am Gesamtsignal und verursachen folglich einen geringeren Störeffekt.through the summation over the measuring voltages, which induces into the individual measuring electrode pairs In the case of comparable magnetic field strength, an increased sensitivity of measurement becomes of the flowmeter according to the invention with respect to a Flowmeter achieved in the prior art. Since the tapped and for the determination the sum flow measured voltage used quantitatively is larger as the measuring voltage of a measuring electrode pair, have interference signals a less pronounced influence on the measurement accuracy than in the case the known flowmeter with only one measuring electrode pair. Instead of the induced measurement voltage to detect with only one measuring electrode pair at the location of the largest magnetic field strength, be with several additional Measuring electrode pairs signal voltages at different locations, at which different magnetic field strengths prevail detected. The be measured at the measuring electrode pairs measured voltages added according to the invention, so that the resulting, used to determine the volume flow Total voltage is greater on the one hand, on the other hand also - like already mentioned - from measuring voltages exists, which are tapped in different places. Therefore have local occurring disturbances, the e.g. produced by particles acting on a measuring electrode in the sum, a smaller proportion of the total signal and thus cause less disturbing effect.
Gemäß einer vorteilhaften Weiterbildung der erfindungsgemäßen Vorrichtung wird vorgeschlagen, dass die Messrohrachse in der Ebene liegt, in der die Verbindungslinien der Messelektroden der Elektrodenpaare liegen.According to one advantageous development of the device according to the invention is proposed that the measuring tube axis lies in the plane in which the connecting lines the measuring electrodes of the electrode pairs lie.
Weiterhin ist gemäß einer vorteilhaften Weiterbildung der erfindungsgemäßen Vorrichtung vorgesehen, dass im Falle einer ungeraden Anzahl von Messelektrodenpaaren ein Elektrodenpaar in dem Bereich angeordnet ist, in dem die maximale Magnetfeldstärke herrscht.Farther is according to one advantageous development of the device according to the invention provided that in the case of an odd number of pairs of measuring electrodes Electrode pair is located in the area where the maximum magnetic field strength prevails.
Darüber hinaus wird vorgeschlagen, dass das Durchflussmessgerät so ausgelegt ist, dass der Abstand der ersten Messelektroden untereinander und der Abstand der zweiten Messelektroden untereinander im wesentlichen äquidistant ist. Alternativ ist vorgesehen, dass der Abstand der ersten Messelektroden untereinander und der Abstand der zweiten Messelektroden untereinander variabel derart bemessen ist, dass die induzierte Summen-Messspannung einen maximalen Wert erreicht.Furthermore It is suggested that the flowmeter is designed so that the distance the first measuring electrodes with each other and the distance of the second Measuring electrodes with each other is substantially equidistant. Alternatively it is provided that the distance between the first measuring electrodes with each other and the distance between the second measuring electrodes is variable is dimensioned such that the induced sum measurement voltage reaches a maximum value.
Die Erfindung wird anhand der nachfolgenden Figuren näher erläutert. Es zeigt:The The invention will be explained in more detail with reference to the following figures. It shows:
In
der Außenwand
des Messrohres
In
den Figuren
Der
Abstand d der ersten Messelektroden
In
Wie
bereits zuvor erwähnt,
lässt sich
durch eine geeignete Variation der Abstände di der ersten Messelektroden
- 11
- magnetisch-induktives Durchflussmessgerätemagneto-inductive Flowmeters
- 22
- Messrohrmeasuring tube
- 33
- MessrohrachseMeasuring tube axis
- 4a4a
- erste Messelektrodefirst measuring electrode
- 4b4b
- erste Messelektrodefirst measuring electrode
- 4n4n
- erste Messelektrodefirst measuring electrode
- 5a5a
- zweite Messelektrodesecond measuring electrode
- 5b5b
- zweite Messelektrodesecond measuring electrode
- 5n5n
- zweite Messelektrodesecond measuring electrode
- 66
- Magnetanordnungmagnet assembly
- 77
- Magnetanordnungmagnet assembly
- 88th
- Schaltungcircuit
- 99
- Regel-/AuswerteeinheitControl / evaluation unit
- 1010
- Mediummedium
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610014679 DE102006014679A1 (en) | 2006-03-28 | 2006-03-28 | Magnetic-inductive flow meter for volumetric medium flow measurement, has two sets of measuring electrodes positioned and moved with respect to each other in direction of measuring pipe axis, and circuit summing induced measuring voltages |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE200610014679 DE102006014679A1 (en) | 2006-03-28 | 2006-03-28 | Magnetic-inductive flow meter for volumetric medium flow measurement, has two sets of measuring electrodes positioned and moved with respect to each other in direction of measuring pipe axis, and circuit summing induced measuring voltages |
Publications (1)
Publication Number | Publication Date |
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DE102006014679A1 true DE102006014679A1 (en) | 2007-10-04 |
Family
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DE200610014679 Withdrawn DE102006014679A1 (en) | 2006-03-28 | 2006-03-28 | Magnetic-inductive flow meter for volumetric medium flow measurement, has two sets of measuring electrodes positioned and moved with respect to each other in direction of measuring pipe axis, and circuit summing induced measuring voltages |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013103211A1 (en) | 2013-03-28 | 2014-10-02 | Endress + Hauser Flowtec Ag | Magnetic-inductive flowmeter |
DE102013114427A1 (en) | 2013-12-19 | 2015-06-25 | Endress + Hauser Flowtec Ag | Arrangement and method for determining a flow-related measured variable |
DE102014111047A1 (en) | 2014-08-04 | 2016-02-04 | Endress+Hauser Flowtec Ag | Magnetic-inductive flowmeter with several measuring electrode pairs and different measuring tube cross-sections and method for measuring the flow |
US11629982B2 (en) | 2018-04-06 | 2023-04-18 | Endress+Hauser Flowtec Ag | Magnetic-inductive flowmeter and measuring point having a magnetic-inductive flowmeter of this type |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1914335A1 (en) * | 1969-03-21 | 1970-12-10 | Krohne Fa Ludwig | Inductive flow meter |
DE2225356A1 (en) * | 1972-05-25 | 1973-12-06 | Interatom | FLOW METER FOR ELECTRICALLY CONDUCTIVE LIQUIDS |
JPS54139756A (en) * | 1978-04-21 | 1979-10-30 | Yokogawa Hokushin Electric Corp | Electromagnetic flowmeter utilizing fluid noise |
DE2950084A1 (en) * | 1979-12-13 | 1981-09-17 | Eckardt Ag, 7000 Stuttgart | Magnetic inductive flow meter - has magnetic field length compensation of auxiliary electrodes supplied via impedance transformers or amplifiers |
JPS56135118A (en) * | 1980-03-27 | 1981-10-22 | Hitachi Ltd | Electromagnetic flow meter |
EP0305609A1 (en) * | 1987-08-05 | 1989-03-08 | MARSH-McBIRNEY, INC. | Averaging velocity sensor for measuring fluid flow in a conduit |
JPH0566138A (en) * | 1991-09-09 | 1993-03-19 | Toshiba Corp | Electromagnetic flowmeter |
GB2292613A (en) * | 1994-08-01 | 1996-02-28 | Edward Hall Higham | Multiple electrode electromagnetic flowmeters |
EP1431716A1 (en) * | 2002-12-21 | 2004-06-23 | ABB PATENT GmbH | Electromagnetic flowmeter |
-
2006
- 2006-03-28 DE DE200610014679 patent/DE102006014679A1/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1914335A1 (en) * | 1969-03-21 | 1970-12-10 | Krohne Fa Ludwig | Inductive flow meter |
DE2225356A1 (en) * | 1972-05-25 | 1973-12-06 | Interatom | FLOW METER FOR ELECTRICALLY CONDUCTIVE LIQUIDS |
JPS54139756A (en) * | 1978-04-21 | 1979-10-30 | Yokogawa Hokushin Electric Corp | Electromagnetic flowmeter utilizing fluid noise |
DE2950084A1 (en) * | 1979-12-13 | 1981-09-17 | Eckardt Ag, 7000 Stuttgart | Magnetic inductive flow meter - has magnetic field length compensation of auxiliary electrodes supplied via impedance transformers or amplifiers |
JPS56135118A (en) * | 1980-03-27 | 1981-10-22 | Hitachi Ltd | Electromagnetic flow meter |
EP0305609A1 (en) * | 1987-08-05 | 1989-03-08 | MARSH-McBIRNEY, INC. | Averaging velocity sensor for measuring fluid flow in a conduit |
JPH0566138A (en) * | 1991-09-09 | 1993-03-19 | Toshiba Corp | Electromagnetic flowmeter |
GB2292613A (en) * | 1994-08-01 | 1996-02-28 | Edward Hall Higham | Multiple electrode electromagnetic flowmeters |
EP1431716A1 (en) * | 2002-12-21 | 2004-06-23 | ABB PATENT GmbH | Electromagnetic flowmeter |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013103211A1 (en) | 2013-03-28 | 2014-10-02 | Endress + Hauser Flowtec Ag | Magnetic-inductive flowmeter |
DE102013114427A1 (en) | 2013-12-19 | 2015-06-25 | Endress + Hauser Flowtec Ag | Arrangement and method for determining a flow-related measured variable |
DE102014111047A1 (en) | 2014-08-04 | 2016-02-04 | Endress+Hauser Flowtec Ag | Magnetic-inductive flowmeter with several measuring electrode pairs and different measuring tube cross-sections and method for measuring the flow |
DE102014111047B4 (en) * | 2014-08-04 | 2016-02-11 | Endress+Hauser Flowtec Ag | Magnetic-inductive flowmeter with several measuring electrode pairs and different measuring tube cross-sections and method for measuring the flow |
US11629982B2 (en) | 2018-04-06 | 2023-04-18 | Endress+Hauser Flowtec Ag | Magnetic-inductive flowmeter and measuring point having a magnetic-inductive flowmeter of this type |
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OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
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Effective date: 20130329 |