EP1819988A2 - Procede pour determiner le debit massique d'un debitmetre massique coriolis - Google Patents

Procede pour determiner le debit massique d'un debitmetre massique coriolis

Info

Publication number
EP1819988A2
EP1819988A2 EP05811169A EP05811169A EP1819988A2 EP 1819988 A2 EP1819988 A2 EP 1819988A2 EP 05811169 A EP05811169 A EP 05811169A EP 05811169 A EP05811169 A EP 05811169A EP 1819988 A2 EP1819988 A2 EP 1819988A2
Authority
EP
European Patent Office
Prior art keywords
sensor signals
mass flow
sum signal
measuring tube
signal
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Withdrawn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
EP05811169A
Other languages
German (de)
English (en)
Inventor
Christian Matt
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 EP1819988A2 publication Critical patent/EP1819988A2/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Withdrawn legal-status Critical Current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
    • G01F1/76—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
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • 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
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8431—Coriolis or gyroscopic mass flowmeters constructional details electronic circuits
    • 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

Definitions

  • the invention relates to a method for determining the mass flow rate of a Coriolis mass flow meter.
  • Coriolis mass flow meters are widely used in process measurement for determining the mass flow of a fluid in a pipe section.
  • the Coriolis measuring principle is based on allowing the fluid to be tested to flow through a vibrating measuring tube and to evaluate the oscillatory movement of the measuring tube.
  • a vibration exciter and two vibration sensors are arranged on the measuring tube.
  • the measuring tube with the fluid together form a vibratory system, which is normally excited at its resonance frequency.
  • the resonant frequency depends, among other things, on the material and dimensions of the measuring tube.
  • the resonant frequency also depends on the density of the fluid flowing in the measuring tube.
  • the measuring tube is not excited at the resonant frequency but at an adjacent frequency.
  • the two vibration sensors detect the oscillatory motion of the
  • the two sensor signals have the same frequency as the oscillatory movement of the measuring tube. If the fluid flows through the measuring tube, the two sensor signals are phase-shifted relative to one another. The phase shift is a measure of the mass flow of the fluid through this pipe section.
  • the sensor signals are evaluated in a measuring / subcircuit to determine the value of the mass flow. This measured value can be displayed in a display unit on the Coriolis mass flow meter.
  • sensors such as Coriolis mass flowmeters, which are used in automation technology, are connected to higher-level units, such as controllers or control systems, etc.
  • other properties of the fluid such as the density can be determined. For this purpose, a frequency evaluation of the oscillatory movement of the measuring tube is necessary.
  • the known measuring circuits operate either analog or digital.
  • EP 698783, US 4,895,030, EP 702212 and US 4,529,002 such measuring circuits are described in more detail.
  • EP 698783 discloses a measuring circuit for a Coriolis mass flow meter which has an analog control circuit which regulates the two sensor signals to the same amplitude. This amplitude control is of crucial importance for the measurement accuracy of the Coriolis mass flow meter.
  • the amplifier used for the analog amplification of the sensor signals
  • Preamplifiers must have sufficient bandwidth to avoid corrupting the sensor signals. Due to interference signals, however, overdriving of the amplifiers may occur. Such overloads have a negative effect on the accuracy of the measured value. The higher the accuracy requirements of the Coriolis mass flow meter, the more complex the analog amplifiers must be formed, which is also reflected in their price.
  • the object of the invention is therefore to provide a method for determining the Masse ⁇ flow of a Coriolis mass flow meter, which does not have the disadvantages mentioned above, which in particular makes low demands on the analog amplifier and that no complex Symmetrieregelung the two Sen ⁇ sorsignale requires.
  • the essential idea of the invention is that the two analogue sensors To convert sorsignale immediately after the pre-amplification into digital signals and perform the further evaluation of the measurement signals exclusively digital.
  • FIG. 1 sensor of a Coriolis mass flow meter in a schematic representation
  • FIG. 2 is a block diagram of a measuring and operating circuit of a Coriolis mass flowmeter
  • FIG. 3 block diagram of the method according to the invention
  • FIG. 4 Pointer diagram for two sensor signals of a Coriolis mass flow meter.
  • FIG. 1 shows a measuring sensor 1 for a Coriolis mass flow meter in a schematic representation.
  • the sensor 1 is arranged in a pipeline, not shown, in which a fluid F flows whose mass flow rate is one of the parameters of interest.
  • the connection with the pipeline takes place via the two flanges 2,3.
  • the sensor 1 has a single straight measuring tube 4, which is fixed on the inlet side via an end plate 13 on the flange 2 and the outlet side via an end plate 14 on the flange 3.
  • the measuring and operating circuit according to the invention is not limited to this special sensor 1 with a single straight measuring tube. It can be used in conjunction with the various known sensors. To mention are, for example, Measuring sensor with a measuring tube with cantilever mass, such. in EP 97 81 0559, sensor with a curved measuring tube (EP 96 10 9242) and sensors with two parallel straight or curved measuring tubes (US 4793191 or US 41 27 028).
  • the flanges 2, 3 and the end plates are attached to or in a support tube 15.
  • a vibration exciter 16 is located in the middle between the two end plates 13, 14 on the measuring tube 4.
  • the vibration exciter 16 may be e.g. to act an electromagnetic drive consisting of a permanent magnet 161 and a coil 162.
  • the coil 162 is fixed to the support tube 15 and the permanent magnet 161 on the measuring tube 4.
  • the oscillation movement of the measuring tube 4 is recorded by means of two vibration sensors 17 and 18, which are also arranged approximately symmetrically to the vibration exciter 16, likewise on the supporting tube 15.
  • vibration sensors 17 and 18, it may be z. B. are electromagnetic transducers that are similar to the arrangement permanent magnet coil of the vibrator 16 are constructed.
  • the two permanent magnets 171, 181 are fixed to the measuring tube 4 and the two coils 172, 182 on the support tube 15.
  • the movement of the measuring tube 4 causes via the magnets 171, 181, an induction voltage in the respective coil 172, 182, which is tapped as an analog sensor signal Sl or S2.
  • a Coriolis mass flow meter generally consists of a measuring transducer and an associated measuring and operating circuit.
  • FIG. 2 shows a block diagram of such a measuring and operating circuit belonging to the measuring sensor 1, which, inter alia, carries out the evaluation of the two sensor signals and controls the oscillation excitation of the measuring tube 4.
  • the two sensor signals X17 and X18 which are received by the vibration sensors 17 and 18, are amplified in two preamplifiers Vl and V2 and each converted into an analog / digital converter AWl or AW2 in digital sensor signals Sl, S2 and a digital signal processor DSP supplied.
  • the digital signal processor DSP supplies the measured value of the mass flow m at a first output A1.
  • Another output A2 supplies a signal which controls the excitation current I for the oscillation excitation of the measuring tube.
  • Fig. 3 shows a schematic representation of the individual process steps that are performed to determine the mass flow rh in the digital signal processor DSP.
  • the two digital sensor signals Sl, S2 are band-limited to channel CHI or CH2 with the aid of an anti-aliasing filter BP1 and fed to a summing element ⁇ and the differentiating element ⁇ .
  • the sum signal ⁇ which is present after the summing ⁇ , on the one hand, the amplitude
  • the sum signal ⁇ is subjected to a Hilbert transformation in a Hilbert term H and multiplied by the difference signal ⁇ delayed in a delay element D.
  • the delay element D is necessary since, in the case of digital discrete-time signal processing, a Hilbertransformator causes a delay. This is readily apparent from the z-representation describing the behavior of the Hilbert transformer.
  • the measured value rh can be further processed in an evaluation circuit, not shown, or displayed in a display, also not shown.
  • a forwarding of the measured value m to a higher-level unit (control, control system) is also conceivable.
  • the relationship between the two sensor signals Sl and S2 is shown with reference to a conventional phasor diagram.
  • the two sensor signals S1 and S2 are shown as vectors and have different amounts due to the unequal amplitudes of the sensor signals.
  • the phase shift between the sensor signals S1, S2, which is caused by the Coriolis effect, is clearly visible.
  • the sum signal is denoted by ⁇ 'and the difference signal of the two sensor signals S 1' and S2 by ⁇ '.

Landscapes

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

Abstract

L'invention concerne un procédé pour déterminer le débit massique d'un débitmètre massique Coriolis. Selon ce procédé, une vibration d'un tube de mesure est produite à la fréquence f et le mouvement vibratoire résultant est détecté en deux points de mesure différents au moyen de deux détecteurs de vibration. Les signaux analogiques X17, X18 des deux détecteurs de vibration sont convertis en signaux numériques S1 et S2 et traités ultérieurement dans un processeur de signaux numériques DSP où le signal de somme Σ et le signal de différence Δ sont formés à partir des deux signaux S1 et S2. Ensuite, le signal de somme subit une rotation de 90º. Au cours d'une autre étape du procédé, le signal de somme décalé est multiplié par le signal de différence Δ. Une fois l'amplitude du signal de somme Σ déterminée, le débit massique est calculé selon la formule <maths><img></img></maths> ~¦Im(Δ)¦/ ( ¦Σ¦ f ). Pour le procédé, il n'est pas nécessaire que les deux signaux de détecteurs S1, S2 présentent la même amplitude. Par conséquent, une régulation pour l'obtention de la même amplitude pour les signaux analogues X17, X18 n'est pas nécessaire.
EP05811169A 2004-11-22 2005-11-21 Procede pour determiner le debit massique d'un debitmetre massique coriolis Withdrawn EP1819988A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004056370A DE102004056370A1 (de) 2004-11-22 2004-11-22 Mess- und Betriebsschaltung für Coriolismassedurchflussaufnehmer
PCT/EP2005/056104 WO2006056560A2 (fr) 2004-11-22 2005-11-21 Procede pour determiner le debit massique d'un debitmetre massique coriolis

Publications (1)

Publication Number Publication Date
EP1819988A2 true EP1819988A2 (fr) 2007-08-22

Family

ID=36313837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05811169A Withdrawn EP1819988A2 (fr) 2004-11-22 2005-11-21 Procede pour determiner le debit massique d'un debitmetre massique coriolis

Country Status (4)

Country Link
US (1) US7854176B2 (fr)
EP (1) EP1819988A2 (fr)
DE (1) DE102004056370A1 (fr)
WO (1) WO2006056560A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7689372B2 (en) * 2006-12-13 2010-03-30 Abb Patent Gmbh Process for operating a measurement device of the vibration type
CN102393661B (zh) * 2011-09-21 2013-03-06 北京航空航天大学 一种科氏质量流量计数字闭环控制系统
DE102013021136B3 (de) * 2013-12-13 2014-12-18 Abb Technology Ag Verfahren zur Laufzeitermittlung der Signale in den Signalpfaden bei einem Coriolis Durchflussmesser
RU2721312C2 (ru) * 2016-02-26 2020-05-18 Майкро Моушн, Инк. Электронный измеритель для двух или более измерительных узлов
DE102023101930A1 (de) 2022-12-02 2024-06-13 Endress+Hauser Flowtec Ag Verfahren zum Überprüfen und/oder (Wieder-)Inbetriebnehmen eines modularen Meßsystems

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559833A (en) * 1982-09-30 1985-12-24 Smith Meter Inc. Meter for measuring mass flow rate
US4914956A (en) 1987-07-22 1990-04-10 Exac Corporation Method and circuit for processing sensory input signals of the type obtained from coriolis mass flow rate sensors and the like
US4934196A (en) * 1989-06-02 1990-06-19 Micro Motion, Inc. Coriolis mass flow rate meter having a substantially increased noise immunity
US5734112A (en) * 1996-08-14 1998-03-31 Micro Motion, Inc. Method and apparatus for measuring pressure in a coriolis mass flowmeter
US5804741A (en) * 1996-11-08 1998-09-08 Schlumberger Industries, Inc. Digital phase locked loop signal processing for coriolis mass flow meter
US6073495A (en) * 1997-03-21 2000-06-13 Endress + Hauser Flowtec Ag Measuring and operating circuit of a coriolis-type mass flow meter
EP1189037A1 (fr) * 2000-09-13 2002-03-20 Endress + Hauser Flowtec AG Débitmètre à effet Coriolis avec système de contrôle numérique
US6606573B2 (en) * 2001-08-29 2003-08-12 Micro Motion, Inc. Sensor apparatus, methods and computer program products employing vibrational shape control
US6666573B2 (en) 2001-10-18 2003-12-23 Frank Grassi Portable mixing/delivery apparatus for pre-blended granular mixtures
DE10322851A1 (de) 2003-05-19 2004-12-16 Endress + Hauser Flowtec Ag, Reinach Coriolis-Durchflußmeßgerät

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006056560A3 *

Also Published As

Publication number Publication date
WO2006056560A2 (fr) 2006-06-01
US20090211373A1 (en) 2009-08-27
US7854176B2 (en) 2010-12-21
DE102004056370A1 (de) 2006-05-24
WO2006056560A3 (fr) 2006-12-21

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