WO1989004463A1 - Procede et dispositif de detection d'erreurs de mesure du debit de massique - Google Patents

Procede et dispositif de detection d'erreurs de mesure du debit de massique Download PDF

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Publication number
WO1989004463A1
WO1989004463A1 PCT/DE1988/000687 DE8800687W WO8904463A1 WO 1989004463 A1 WO1989004463 A1 WO 1989004463A1 DE 8800687 W DE8800687 W DE 8800687W WO 8904463 A1 WO8904463 A1 WO 8904463A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
measuring
phase
measuring points
flow device
Prior art date
Application number
PCT/DE1988/000687
Other languages
German (de)
English (en)
Inventor
Michael Lang
Original Assignee
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 Flowtec Ag filed Critical Flowtec Ag
Publication of WO1989004463A1 publication Critical patent/WO1989004463A1/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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
    • G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
    • G01F1/8495—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits with multiple measuring conduits

Definitions

  • the invention relates to a method for the detection of errors in the mass flow measurement by means of a phase shift of oscillating and / or rotary movements generated by Corioiis forces into which a flow device through which fluid flows is placed, and a device for carrying out the method.
  • a flow device for example a measuring tube system, which consists of one, two or even more measuring tubes with curved and / or straight sections, is excited to produce torsional or bending vibrations. If a fluid flows through the measuring tube system, coriotic forces arise due to its mass and flow velocity, which act on the inner wall of the moving measuring tube perpendicular to the flow direction. attack.
  • the magnitude and phase curve of the Corioiis forces over the length of the measuring tube system through which flow flows is ideally point-symmetrical with respect to the center of the measuring tube system, and thus corresponds to an odd function.
  • the movements of the measuring tube system are out of phase with one another over the length of the system through which they flow.
  • the ideal course of this phase shift is quasi-linear in a wide range.
  • the object of the invention is to create a method with which the presence of measurement errors which are caused by deviations from the ideal course of the phase shifts can be recognized and displayed.
  • this object is achieved according to the invention in that at least two phase differences between the oscillating and / or rotating movements are determined at at least three measuring points which are arranged at a distance from one another along the flow device in the direction of flow and at which the phase position of the oscillating and / or rotating movements is measured, and that the determined phase differences are compared for deviation from one another for error detection.
  • the method according to the invention is used to check whether the real course of the phase shift deviates from the known ideal course. Such a deviation manifests itself in a non-linearity and asymmetry, which has the consequence that the phase shifts between different pairs of measuring points differ from one another. If a deviation is found which exceeds a predetermined threshold value, it can be indicated that the measurement result has been falsified, so that a suitable zero point correction can be carried out.
  • the method according to the invention can be implemented simply and inexpensively. Although at least three measuring points are required, which are arranged at different locations along the flow device, the two measuring points which are present anyway for determining the mass flow can be used for two of them. If a higher level of certainty is to be achieved in the measurement of the course of the phase shift, four or even more measuring points can also be arranged accordingly.
  • the evaluation of the sensor signals for the error detection largely takes place according to the same principle as the usual evaluation of the sensor signals for the mass flow measurement, so that the evaluation unit which is present for the mass flow measurement with minor changes can also be used for the error detection .
  • the determination of the phase differences can expediently be achieved by measuring the time differences between the times at which the flow device reaches or traverses corresponding points in space during its oscillating and / or rotating movements at the measuring points.
  • Suitable points in space are in particular the axis of the flow device in its rest position, the crossing of this axis corresponding to the zero crossing of the oscillating and / or rotating movement, or the points of the greatest deflection which correspond to the maximum of the oscillating and / or rotating correspond to movements.
  • a certain reference point is usually specified for measuring reasons, which then corresponds to the zero point of the phase shift. If the measuring points are arranged symmetrically with respect to this reference or zero point and also at the same distance from one another, then the comparisons for determining deviations can be carried out particularly easily, since only one corresponding to the length distances is required in the arithmetic operations required for this Constant to be included. The comparisons are further simplified if a measuring point is itself arranged in the reference or zero point.
  • Fig. 3 shows another basic arrangement of a mass flow meter according to the invention.
  • the flow measuring arrangement shown in FIG. 1 contains a flow device 1 which is inserted into a fluid line through which the fluid flows, the flow of which is to be measured.
  • the flow device 1 is designed as a straight measuring tube, but it can in principle have any shape, for example u-shape, loop shape or the like.
  • the flow device 1 is firmly clamped at its input-side end 2 and at its output-side end 3.
  • a vibration exciter 4 is preferably arranged in the middle of the flow device 1.
  • it can have a fixedly mounted drive coil 5 and a permanent magnet 6 connected to the flow device 1. If an alternating current flows through the drive coil 5, a corresponding alternating magnetic field is generated, by means of which the permanent magnet 6 is alternately attracted and repelled.
  • the flow device 1 is set into bending vibrations which are symmetrical to the center of the flow device.
  • the bending vibration line is indicated in FIG. 1 by five arrows of different lengths running perpendicular to the longitudinal axis of the flow-through device 1.
  • the frequency • of the AC voltage with which the bending vibrations are excited preferably corresponds to the resonance frequency of the flow device 1; for example, it can be in the range between 600 and 1000 Hz.
  • phase shifts are greater the larger the coriotic forces acting on the flow device 1. Since the Corioiis ⁇ forces depend on the mass and the flow rate of the fluid, the phase shifts are a measure of the mass flow of the fluid.
  • two sensors 7 and 8 are arranged at two measuring points M 1 and M, which are on both sides of the vibration exciter 4 and at the same distance from it, which detect the oscillating movement of the flow device 1 in convert electrical sensor signals that indicate the phase position of the oscillating movement at the sensor location.
  • the exemplary embodiment shown will use magnetic-inductive sensors, each of which has a permanent magnet 7a or 8a attached to the flow-through device 1 and a fixed induction coil 7b or 8b.
  • the permanent magnet of each sensor moves relative to the induction coil, whereby an alternating voltage is induced in the induction coil, the phase position of which is in a fixed and known relationship to the phase position of the oscillating movement.
  • a further vibration sensor 9 with a permanent magnet 9a and an induction coil 9b is arranged at a third measuring point M Q.
  • sensors of a known type can of course also be used, which are capable of converting mechanical oscillating movements into electrical sensor signals, which allow the phase position of the oscillating movement to be recognized at the location of the sensor.
  • sensors are used which work without contact, so that they do not influence the mechanical oscillation movement in any way.
  • optical or capacitive sensors are particularly suitable for this.
  • the electrical sensor signals supplied by the sensors 7, 8 and 9 are fed to an electronic evaluation unit 10.
  • the electronic evaluation unit is designed such that it determines the phase shift between the sensor signals of the two outer sensors 7 and 8 as a measure of the mass flow of the fluid flowing through the flow device 1. This corresponds to the normal functioning of Coriolis force mass flow meters of this type.
  • the evaluation unit 10 can be formed, for example, by a suitably programmed microcomputer, the analog-digital Converters are connected upstream which convert the sensor signals into digital signals which are suitable for processing by the microcomputer.
  • the evaluation unit 10 emits a measured value signal S 1 at an output, which represents the determined phase shift or the mass flow rate corresponding to this phase shift.
  • the diagram of FIG. 2 serves to illustrate the course of the phase shift over the length of the flow device 1 between the two clamping points 2 and 3.
  • the length L of the flow device 1 is plotted as the abscissa and the phase shifts, the oscillating movements, are plotted as the ordinate have at each point of the flow device 1 with respect to the oscillating movement at the point of the excitation device 4 selected as the reference point or zero point.
  • the phase shifts are represented by the time differences .DELTA.t that exist between the times at which the flow device 1 reaches or crosses corresponding points in space during its oscillating movements.
  • Particularly suitable points in space for the determination of the time differences are the zero crossings of the oscillating movement, at which the flow device crosses the axis corresponding to the rest position.
  • Other suitable points are the maxima of the oscillating movement, at which the flow device 1 reaches the points of large deflection.
  • phase shifts can be specified without distinction in terms of time or in terms of angle. Because of the measurement principle used, the measure of time is used in the following description.
  • the fluid flows through the flow-through device 1 at a speed other than zero, coriotic forces arise which depend both on the mass and on the flow velocity of the fluid.
  • Corioiis forces cause phase shifts of the oscillating movements along the flow device 1 in such a way that a phase advance at the points lying in the flow direction before the reference point and at the points lying behind the reference point in the flow direction cause a phase lag with respect to the phase position the oscillation movement exists at the reference point.
  • the phase advances correspond to negative values and the phase advances correspond to positive values of the time differences ⁇ t.
  • the magnitude of the time differences is in the range between -1500 ns and +1500 ns.
  • the evaluation circuit 10 determines the phase difference between the oscillating movements at the measuring points 1 and M as a measure of the mass flow.
  • the course of the phase shift can deviate from the linear ideal course caused exclusively by Corioiis forces.
  • changes in the properties of the fluid such as density and viscosity in connection with manufacturing-related tolerances
  • changes in the parameters of the vibrating system for example due to abrasion, corrosion and deposits, damping effects in the vicinity of the clamping points of the measuring tubes , incompletely filled measuring tubes etc.
  • the evaluation circuit 10 measures a phase difference P of 900 ns between the oscillating movements at the measuring points M ⁇ and M. Since it cannot be seen for the evaluation circuit 10 from the sensor signals of the measuring points M ⁇ and M 2 that there is a deviation from the linear course, it would assign a value of the mass flow rate to the phase difference P J_D according to conventional measuring methods would correspond to the same phase difference with a linear curve. The measurement result would be falsified without the presence of a measurement error being recognizable.
  • the presence of a measuring error caused by a nonlinear and asymmetrical course of the phase shift is recognized and displayed with the aid of the third measuring point M Q arranged in the reference point or zero point.
  • the evaluation unit 10, which also receives the sensor signal from the third measuring point M Q is designed such that it uses the sensor signals of the measuring points M 1 and M Q to determine the phase difference 3? 1 0 between the oscillating movements at the measuring points M 1 and M Q and from the sensor signals of the measuring points M 2 and M Q the phase difference P 2 Q between the oscillating movements at the measuring points 2 and M Q is determined.
  • the amounts on this Phase differences P Q and P 2 Q additionally determined in this way are compared in the evaluation unit 10 for a deviation from one another, and if a deviation is ascertained which exceeds a predetermined threshold value K, this shows
  • Evaluation unit the presence of a measurement error. For this purpose, for example, it can output a binary error signal S " ⁇ at a second output, which has the value 0 if the deviation is smaller than or equal to the threshold value K and which takes the value 1 if a deviation is found which is greater than the threshold value K.
  • the determined phase differences P. _ and P 2 _ are evaluated using the following formula:
  • the threshold value K is positive and freely selectable. For example, it can be 1 ns.
  • the deviation between the amounts of these phase differences would be 100 ns, that is to say substantially larger than the threshold value, so that the presence of a measurement error would be indicated.
  • the determination of the phase differences ⁇ ° 1 Q and P 2 Q in the evaluation unit 10 can of course be carried out in the same way and with the same means as the determination of the phase difference between the sensor signals of the measuring points M 1 and M ⁇ which is known to the person skilled in the art with conventional mass flow meters.
  • the determination of the deviation between the amounts of the phase differences P ⁇ 0 and P_ Q and the comparison of this deviation with the threshold value K offers the person skilled in the art no difficulty. It is therefore not necessary to set up and work to explain the evaluation unit 10 in more detail.
  • the flow measuring arrangement shown in FIG. 3 differs from that of FIG. 1 initially in that the flow device 11 has two straight parallel measuring tubes 12 and 13 which are connected to a fluid line by means of an inlet-side distributor piece 14 and an outlet-side distributor piece 15 are inserted that the fluid is divided between the two measuring tubes 12 and 13 and flows through them in parallel.
  • the distributor pieces 14 and 15 are preferably rigid, so that they form fixed clamping points for the ends of the measuring tubes 12 and 13.
  • a vibration exciter 16 is attached, which has a fixed drive coil 17 and two permanent magnets 18 and 19 attached to the measuring tubes. If the drive coil 17 is excited by an alternating current, the permanent magnets 18 and 19 are periodically attracted and repelled. As a result, the measuring tubes 12 and 13 are set into opposite-phase bending vibrations.
  • Another difference from the flow measuring arrangement of FIG. 1 is that in the flow measuring arrangement of FIG. 3 four measuring points M ⁇ , M 2 , M ⁇ , M. are arranged along the flow device 1.
  • the measuring points M 1 and M. are at equal distances from the vibration exciter 16, that is to say symmetrically with respect to the vibration exciter, near the ends of the measuring tubes, and the measuring points 2 and are also at the same distance from the vibration exciter 16, that is to say symmetrically with respect to the vibration exciter to each other, between the outer measuring points 1 or M. and the vibration exciter.
  • each measuring point there is a sensor 21, 22, 23 and 24, which converts the oscillating movements of the measuring tubes 12, 13 at the measuring point into electrical sensor signals, which let the phase position of the oscillating movements be recognized.
  • magnetic Inductive sensors are shown, each of which has a permanent magnet 21a, 22a, 23a and 24a connected to the measuring tube 12 and an induction coil 21b, 22b, 23b and 24b connected to the measuring tube 13.
  • the sensor signals supplied by the sensors are fed to an evaluation unit 25.
  • the evaluation circuit 25 determines the phase difference between the sensor signals of the outer measuring points M 1 and M. as a measure of the mass flow. In order to determine whether there is a measurement error, the evaluation unit 25 determines in this case a first phase difference P 3 1 between the oscillating movements at the measuring points M. and M 3 and a second phase difference P 4 2 between the oscillating movements the measuring points M 2 and M ,.
  • the phase differences determined in this way are compared with one another in the manner described above, and the presence of a measurement error is indicated when a deviation is ascertained which exceeds a predetermined threshold value.
  • a larger even or odd number of measuring points can also be provided, from whose sensor signals the phase differences between the oscillating movements at pairs of measuring points are then determined . the phase differences determined are then compared in pairs with one another in order to determine deviations which indicate the presence of a measurement error.
  • one measuring point should preferably be in the reference point, and if any even number of measuring points are used, the measuring points should be arranged in pairs symmetrically to one another with respect to the reference point.

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

Abstract

Un dispositif de mesure du débit massique selon le principe de Coriolis comprend un dispositif d'écoulement qui est traversé par le fluide et dont le débit est mesuré, un dispositif excitateur qui transmet au dispositif d'écoulement un mouvement oscillatoire transversal au sens d'écoulement, et des capteurs, agencés en au moins trois points de mesure longitudinalement espacés sur le dispositif d'écoulement et qui fournissent des signaux caractéristiques de la relation des phases du mouvement oscillatoire du dispositif d'écoulement à chaque point de mesure. Une unité d'évaluation reçoit les signaux des capteurs et en dérive un décalage de phase généré par les forces de Coriolis qui sert de mesure du débit. Afin de détecter des erreurs de mesure du débit massique, l'unité d'évaluation dérive des différences de phase de signaux de capteurs en provenance de deux points de mesure, compare les différences de phase ainsi obtenues et affiche une erreur lorsque des écarts sont ainsi constatés.
PCT/DE1988/000687 1987-11-09 1988-11-07 Procede et dispositif de detection d'erreurs de mesure du debit de massique WO1989004463A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3738018.4 1987-11-09
DE19873738018 DE3738018A1 (de) 1987-11-09 1987-11-09 Verfahren zur fehlererkennung und -korrektur, insbesondere bei einem massendurchfluss-messgeraet

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WO1989004463A1 true WO1989004463A1 (fr) 1989-05-18

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0469448A1 (fr) * 1990-07-28 1992-02-05 KROHNE MESSTECHNIK MASSAMETRON GmbH & Co. KG Débitmètre massique
WO2000004346A1 (fr) * 1998-07-16 2000-01-27 Micro Motion, Inc. Ameliorations apportees a des detecteurs de parametres de conduit vibrant et methodes d'exploitation afferentes faisant intervenir une integration spatiale
US6092409A (en) * 1998-01-29 2000-07-25 Micro Motion, Inc. System for validating calibration of a coriolis flowmeter
US7562586B2 (en) 2005-10-21 2009-07-21 Endress + Hauser Flowtec Ag Method for monitoring an operating condition of a tube wall contacted by a flowing medium and inline measuring device therefore
RU2494388C2 (ru) * 2008-02-01 2013-09-27 Крафт Фудз Ар Энд Ди, Инк. Способ определения консистенции пищевого продукта и устройство для реализации способа

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3808913C1 (en) * 1988-03-17 1989-12-07 Rheometron Ag, Basel, Ch Method and circuit arrangement for processing the measuring signals from flow meters
DE4200871C1 (en) * 1992-01-15 1993-05-06 Wolfgang 8045 Ismaning De Drahm Determn. of mechanical stress conditions of measuring tubes of flow meter
DE4226391C2 (de) * 1992-08-10 1995-07-20 Flowtec Ag Verfahren zur Erkennung einer Nullpunktdrift eines Coriolis-Massedurchflußaufnehmers
DE19719587A1 (de) * 1997-05-09 1998-11-19 Bailey Fischer & Porter Gmbh Verfahren und Einrichtung zur Erkennung und Kompensation von Nullpunkteinflüssen auf Coriolis-Massedurchflußmesser
US6318186B1 (en) * 1999-06-28 2001-11-20 Micro Motion, Inc. Type identification and parameter selection for drive control in a coriolis flowmeter
DE10335665B4 (de) * 2003-08-04 2005-10-27 Siemens Ag Massendurchflussmessgerät
DE102005050898A1 (de) * 2005-10-21 2007-05-03 Endress + Hauser Flowtec Ag In-Line-Meßgerät

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US3276257A (en) * 1960-02-02 1966-10-04 Roth Wilfred Gyroscopic mass flowmeters
US4192184A (en) * 1978-11-13 1980-03-11 Halliburton Company Mass flowmeter
EP0083144A1 (fr) * 1981-02-17 1983-07-06 Micro Motion Incorporated Méthode et appareil pour la mesure d'un débit massique
DE3503841A1 (de) * 1985-02-05 1986-08-07 Karl Dipl.-Ing. 8060 Dachau Küppers Massedurchflussmesser
GB2171200A (en) * 1985-02-15 1986-08-20 Danfoss As Mass flow meters making use of coriolis effects
EP0196150A1 (fr) * 1985-03-25 1986-10-01 International Control Automation Finance S.A. Mesure de l'écoulement d'un fluide
EP0263719A1 (fr) * 1986-10-10 1988-04-13 International Control Automation Finance S.A. Mesure des débits massiques des écoulements de fluide

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US4491025A (en) * 1982-11-03 1985-01-01 Micro Motion, Inc. Parallel path Coriolis mass flow rate meter

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Publication number Priority date Publication date Assignee Title
US3276257A (en) * 1960-02-02 1966-10-04 Roth Wilfred Gyroscopic mass flowmeters
US4192184A (en) * 1978-11-13 1980-03-11 Halliburton Company Mass flowmeter
EP0083144A1 (fr) * 1981-02-17 1983-07-06 Micro Motion Incorporated Méthode et appareil pour la mesure d'un débit massique
DE3503841A1 (de) * 1985-02-05 1986-08-07 Karl Dipl.-Ing. 8060 Dachau Küppers Massedurchflussmesser
GB2171200A (en) * 1985-02-15 1986-08-20 Danfoss As Mass flow meters making use of coriolis effects
EP0196150A1 (fr) * 1985-03-25 1986-10-01 International Control Automation Finance S.A. Mesure de l'écoulement d'un fluide
EP0263719A1 (fr) * 1986-10-10 1988-04-13 International Control Automation Finance S.A. Mesure des débits massiques des écoulements de fluide

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0469448A1 (fr) * 1990-07-28 1992-02-05 KROHNE MESSTECHNIK MASSAMETRON GmbH & Co. KG Débitmètre massique
US5253533A (en) * 1990-07-28 1993-10-19 Krohne Messtechnik Massametron Gmbh & Co. Kg Mass flow meter
US6092409A (en) * 1998-01-29 2000-07-25 Micro Motion, Inc. System for validating calibration of a coriolis flowmeter
WO2000004346A1 (fr) * 1998-07-16 2000-01-27 Micro Motion, Inc. Ameliorations apportees a des detecteurs de parametres de conduit vibrant et methodes d'exploitation afferentes faisant intervenir une integration spatiale
US6233526B1 (en) 1998-07-16 2001-05-15 Micro Motion, Inc. Vibrating conduit parameter sensors and methods of operation therefor utilizing spatial integration
US7562586B2 (en) 2005-10-21 2009-07-21 Endress + Hauser Flowtec Ag Method for monitoring an operating condition of a tube wall contacted by a flowing medium and inline measuring device therefore
RU2494388C2 (ru) * 2008-02-01 2013-09-27 Крафт Фудз Ар Энд Ди, Инк. Способ определения консистенции пищевого продукта и устройство для реализации способа
US8567250B2 (en) 2008-02-01 2013-10-29 Kraft Foods R&D, Inc. Method of determining the texture of food material and apparatus for use in this method
US9417214B2 (en) 2008-02-01 2016-08-16 Kraft Foods R & D, Inc. Apparatus for determining the texture of food material

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Publication number Publication date
DE3738018C2 (fr) 1989-10-12
DE3738018A1 (de) 1989-05-24

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