WO2009109561A1 - Procédé pour contrôler un indicateur électromagnétique de débit et agencement de mesure électromagnétique de débit - Google Patents

Procédé pour contrôler un indicateur électromagnétique de débit et agencement de mesure électromagnétique de débit Download PDF

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Publication number
WO2009109561A1
WO2009109561A1 PCT/EP2009/052481 EP2009052481W WO2009109561A1 WO 2009109561 A1 WO2009109561 A1 WO 2009109561A1 EP 2009052481 W EP2009052481 W EP 2009052481W WO 2009109561 A1 WO2009109561 A1 WO 2009109561A1
Authority
WO
WIPO (PCT)
Prior art keywords
capacitor
flow meter
arrangement
current direction
coil arrangement
Prior art date
Application number
PCT/EP2009/052481
Other languages
German (de)
English (en)
Inventor
Steen Moellebjerg Matzen
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2009109561A1 publication Critical patent/WO2009109561A1/fr

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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
    • G01F1/60—Circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters

Definitions

  • the invention relates to a method for checking an electromagnetic flow meter according to the preamble of claim 1 and to an electromagnetic flow measuring arrangement according to the preamble of claim 4.
  • a method and a flow measuring arrangement of this type are already known from DE 199 17 268 B4.
  • the rise time of the current in the coil arrangement is determined and compared with a reference value.
  • the increase in current is referred to as a "fingerprint" for the particular flowmeter, and as long as the flowmeter is undisturbed, that is to say faultless, the progressions are virtually identical with a very narrow spread, and only when an electrical or magnetic fault occurs This will indicate that the flowmeter may be providing inaccurate readings and need to be checked or replaced.
  • the well-known flowmeter monitoring has the advantage of checking both the electrical properties and the magnetic properties, because the current increase is affected by both electrical and magnetic influences, which is checked while measuring a flow, so you do not even have to interrupt the flow measurement and still be able to run virtually or per manent to make a check.
  • This also has the advantage that the flow meter is checked exactly in the state in which it works.
  • the reference value is preferably determined at the flow meter itself at an earlier time. One determines the desired parameter, for example, during startup and sets this as a reference so that it is available for future review. This gives each flow meter an individual reference value, so that the check can be very accurate. Errors that can arise due to a faulty reference value, are practically not available.
  • the rise time is determined as a parameter.
  • the first one measures the time that elapses between two predetermined current values.
  • the time period that elapses between the switching of the current direction and the reaching of a predetermined current value is measured as a parameter.
  • a time measurement is required in both alternatives, which is always associated with a certain effort.
  • the invention has for its object to allow even easier way to check the flow meter, without having to accept sacrifices in terms of reliability of the verification process.
  • the new method of the type mentioned in the characterizing part of claim 1 features.
  • advantageous embodiments of the method and a new flow measuring arrangement are given.
  • the above-mentioned disadvantages of the known method for checking an electromagnetic flow meter and the known flow measuring arrangement are largely avoided by the invention.
  • the advantages of the known method with verification based on the rise time apply in a corresponding manner to the new method.
  • the invention has the advantage that it is possible to dispense with a time measurement and thus reduces the expense of detecting a parameter which also changes markedly when the electrical or magnetic properties of the coil arrangement change.
  • a parameter which depends on the energy stored in a capacitor can be measured particularly easily in electronic circuits, for example if the voltage applied to the capacitor is detected and evaluated for this purpose.
  • a bridge circuit with electronic switches is used for periodically changing the current direction, which are each provided with a freewheeling diode.
  • the inductive energy present in the coil arrangement before a change in the current direction, apart from ohmic losses, is largely completely transferred when the electronic switches are switched off into capacitive energy which is temporarily stored in the capacitor.
  • the energy stored in the capacitor acts advantageously as a quasi-boost voltage source for a faster current increase in the new current direction.
  • the capacitive energy is converted relatively quickly back into inductive energy in the coil assembly.
  • the peak value of the capacitor voltage is used as a parameter which depends on the energy stored in the capacitor, this has the advantage that a circuit-technically particularly simple peak detector can be used to detect the parameter and the evaluation can be carried out completely without time measurements , On the contrary, a simple comparison of the level of the peak value and the reference value suffices in the evaluation. If the comparison yields deviations which exceed a predefined threshold value, then changes to the electrical and / or magnetic properties of the coil arrangement can be inferred, which are inadmissible and can lead to measurement errors.
  • Figure 1 is a schematic diagram of a flow measuring device
  • Figure 2 shows a time course of the coil current and a time course of the capacitor voltage.
  • FIG. 1 shows parts of an electromagnetic flow meter, which may be of importance for explaining the invention.
  • a measuring tube 2 is traversed perpendicular to the plane of a medium whose flow velocity is to be measured. Perpendicular to the flow direction is one Coil arrangement of two coils 3, 4 are arranged, which generate a magnetic field perpendicular to the flow direction when the coils 3, 4 are traversed by a current I.
  • measuring electrodes 5, 6 and ground electrodes 7, 8 are provided in the measuring tube 2 measuring electrodes 5, 6 and ground electrodes 7, 8 are provided.
  • the measuring electrodes 5, 6 are arranged so that they detect a potential difference or voltage perpendicular to the flow direction and perpendicular to the magnetic field.
  • the voltage between the electrodes 5, 6 increases with increasing velocity of the flowing medium in the measuring tube 2 and with increasing strength of the magnetic field.
  • the measuring electrodes 5, 6 are connected to a differential amplifier, which is followed by an analog / digital converter. Differential amplifier and converter are not shown in the figure for clarity.
  • the digital values obtained by the analog / digital converter correspond to the flow rate and are output as measured values by the electromagnetic flow meter, for example via a field bus to a control station in an automation system.
  • the coils 3, 4 are connected in series and are fed by an operating voltage 9, to which a diode can be connected in series, so that no currents flow back into the operating voltage source.
  • the direction of the coil current I is determined by an H-bridge circuit with four electronic switches 10 to 13, each switch being protected by a freewheeling diode 14 to 17. If the current I in the direction indicated by an arrow to flow through the coil assembly 3, 4, then the switches 10 and 13 are closed. The switches 11 and 12 are open. When the current direction is to be reversed, the switches 11 and 12 are closed while the switches 10 and 13 are opened. The timing of the opening and closing operations ensures that at no time more than two electronic switches are closed, so that a short circuit of the operating voltage is avoided.
  • the coil current I is set in the measuring phases by a controller 25 by means of an adjustable current source 18 and a measuring resistor 19 to a constant value.
  • a capacitor 27 is connected, whose voltage is indicated by U. This capacitor 27 serves to temporarily store the energy which is present as inductive energy before switching operations due to the current I flowing through the coil arrangement 3, 4.
  • the energy E can be calculated according to the formula
  • L is the inductance of the coil assembly 3, 4.
  • the capacitive energy cached during the switching operation in the capacitor 27 is used in an advantageous manner after closing the switch required for the new current direction, for example, the switches 11 and 12, for rapid construction of the desired current I, since now the temporarily stored capacitive energy back into a inductive energy in the coil assembly 3, 4 is transferred.
  • a time characteristic 30 of the coil current I is shown in FIG. 2 at the top, and a time profile 31 of the capacitor voltage U is shown below in FIG. 2, which have been obtained by simulation of circuit components.
  • the respective peak values that occur during the individual switching processes are detected by the evaluation device 28 (FIG. 1) and compared with a reference value predetermined, for example, during startup. This is, for example, 21 V. Occur between peak value and reference value deviations greater than, for example, 0.2 V, an error message is generated and output because the coil assembly changes in their electrical or magnetic properties have occurred, the accuracy of the measurement of a Affect flow measurement.

Abstract

L'invention concerne un procédé pour contrôler un indicateur électromagnétique de débit ainsi qu'un agencement de mesure électromagnétique de débit comprenant un tube de mesure (2) et un agencement de bobine (3, 4) destiné à produire un champ magnétique perpendiculaire au sens du débit à travers le tube de mesure, le sens d'écoulement étant modifié périodiquement. Lors d'une modification du sens d'écoulement, au moins une partie de l'énergie induite présente auparavant dans l'agencement de bobine est stockée temporairement dans un condensateur (27). Grâce à un dispositif d'évaluation (28), on détermine au moins un paramètre dépendant de l'énergie stockée temporairement, et on la compare avec une valeur de référence. Dans le cas de variations improprement élevées, une défaillance de l'indicateur de débit est constatée. La surveillance se caractérise par ses particulières simplicité et fiabilité.
PCT/EP2009/052481 2008-03-03 2009-03-03 Procédé pour contrôler un indicateur électromagnétique de débit et agencement de mesure électromagnétique de débit WO2009109561A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008012341A DE102008012341B3 (de) 2008-03-03 2008-03-03 Verfahren zum Überprüfen eines elektromagnetischen Durchflussmessers und elektromagnetische Durchflussmessanordnung
DE102008012341.2 2008-03-03

Publications (1)

Publication Number Publication Date
WO2009109561A1 true WO2009109561A1 (fr) 2009-09-11

Family

ID=40718981

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/052481 WO2009109561A1 (fr) 2008-03-03 2009-03-03 Procédé pour contrôler un indicateur électromagnétique de débit et agencement de mesure électromagnétique de débit

Country Status (2)

Country Link
DE (1) DE102008012341B3 (fr)
WO (1) WO2009109561A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103791954A (zh) * 2014-01-24 2014-05-14 上海肯特仪表股份有限公司 电磁流量计的励磁电路及其励磁电流控制方法
EP2827110A4 (fr) * 2012-03-15 2015-11-25 Azbil Corp Circuit d'excitation pour débitmètre électromagnétique et débitmètre électromagnétique
US9341506B2 (en) 2012-06-12 2016-05-17 Endress + Hauser Flowtec Ag Method for controlling excitation energy in a coil arrangement of a flow measuring device embodied as a two-conductor field device
CN105793675A (zh) * 2013-11-11 2016-07-20 恩德斯+豪斯流量技术股份有限公司 用于操作磁感应测量系统的方法
WO2018215034A1 (fr) * 2017-07-07 2018-11-29 Apator Miitors Aps Débitmètre électromagnétique
US10865703B2 (en) 2016-05-20 2020-12-15 Volvo Truck Corporation Conduit connection assembly with pressure relief

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2721430A1 (de) * 1977-05-12 1978-11-16 Hammelrath Turbo Werk Fritz Induktiver durchflussmesser
US6031740A (en) * 1998-07-03 2000-02-29 Endress + Hauser Flowtec Ag Method of regulating the coil current of electromagnetic flow sensors
WO2007033697A1 (fr) * 2005-09-21 2007-03-29 Siemens Aktiengesellschaft Procede pour faire fonctionner un dispositif electromagnetique de mesure de debit, et dispositif electromagnetique de mesure de debit correspondant
DE102006026772A1 (de) * 2006-06-07 2007-12-13 Endress + Hauser Flowtec Ag Verfahren und Vorrichtung zur Bestimmung des Volumen- oder Messestroms

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6697742B1 (en) * 1996-01-17 2004-02-24 Abb Kent-Taylor Limited Method and apparatus for testing electromagnetic flowmeters
DE19917268B4 (de) * 1999-04-16 2005-07-14 Siemens Flow Instruments A/S Verfahren zum Überprüfen eines elektromagnetischen Durchflußmessers und elektromagnetische Durchflußmesseranordnung
DE19917261C5 (de) * 1999-04-16 2010-09-09 Siemens Flow Instruments A/S Elektromagnetische Durchflußmesseranordnung
DE102004057680A1 (de) * 2004-11-29 2006-06-01 Endress + Hauser Flowtec Ag Verfahren zur Funktionsüberwachung eines Magnetisch Induktiven Durchflussmessaufnehmers
DE102006006152A1 (de) * 2005-12-23 2007-07-05 Abb Patent Gmbh Verfahren zur Regelung und Überwachung eines Messsystems, sowie Messsystem selbst

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2721430A1 (de) * 1977-05-12 1978-11-16 Hammelrath Turbo Werk Fritz Induktiver durchflussmesser
US6031740A (en) * 1998-07-03 2000-02-29 Endress + Hauser Flowtec Ag Method of regulating the coil current of electromagnetic flow sensors
WO2007033697A1 (fr) * 2005-09-21 2007-03-29 Siemens Aktiengesellschaft Procede pour faire fonctionner un dispositif electromagnetique de mesure de debit, et dispositif electromagnetique de mesure de debit correspondant
DE102006026772A1 (de) * 2006-06-07 2007-12-13 Endress + Hauser Flowtec Ag Verfahren und Vorrichtung zur Bestimmung des Volumen- oder Messestroms

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2827110A4 (fr) * 2012-03-15 2015-11-25 Azbil Corp Circuit d'excitation pour débitmètre électromagnétique et débitmètre électromagnétique
US9341506B2 (en) 2012-06-12 2016-05-17 Endress + Hauser Flowtec Ag Method for controlling excitation energy in a coil arrangement of a flow measuring device embodied as a two-conductor field device
CN105793675A (zh) * 2013-11-11 2016-07-20 恩德斯+豪斯流量技术股份有限公司 用于操作磁感应测量系统的方法
CN103791954A (zh) * 2014-01-24 2014-05-14 上海肯特仪表股份有限公司 电磁流量计的励磁电路及其励磁电流控制方法
US10865703B2 (en) 2016-05-20 2020-12-15 Volvo Truck Corporation Conduit connection assembly with pressure relief
WO2018215034A1 (fr) * 2017-07-07 2018-11-29 Apator Miitors Aps Débitmètre électromagnétique

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