WO2010085972A1 - Débitmètre massique à effet coriolis, et procédé de fonctionnement correspondant - Google Patents

Débitmètre massique à effet coriolis, et procédé de fonctionnement correspondant Download PDF

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Publication number
WO2010085972A1
WO2010085972A1 PCT/EP2009/000548 EP2009000548W WO2010085972A1 WO 2010085972 A1 WO2010085972 A1 WO 2010085972A1 EP 2009000548 W EP2009000548 W EP 2009000548W WO 2010085972 A1 WO2010085972 A1 WO 2010085972A1
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WO
WIPO (PCT)
Prior art keywords
frequency range
excitation
coriolis mass
mass flowmeter
detected
Prior art date
Application number
PCT/EP2009/000548
Other languages
German (de)
English (en)
Inventor
Thomas Bierweiler
Martin Borrmann
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
Priority to PCT/EP2009/000548 priority Critical patent/WO2010085972A1/fr
Publication of WO2010085972A1 publication Critical patent/WO2010085972A1/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
    • G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
    • G01F1/8477—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane with multiple measuring conduits
    • 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
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing

Definitions

  • the present invention relates to a Coriolis mass flow meter and a method for operating a Coriolis mass flow meter. Furthermore, the present invention relates to a system with at least one pipeline, to which at least one Coriolis mass flowmeter is flanged.
  • Coriolis mass flowmeters generally have a single meter tube or a number, for example a pair, of meter tubes through which flows a medium (e.g., fluid) whose mass flow rate is to be determined.
  • a medium e.g., fluid
  • Different arrangements and geometries of the measuring tubes are known.
  • Coriolis mass flow meters with a single straight measuring tube and Coriolis mass flow meters with two curved, parallel measuring tubes.
  • the latter measuring tubes which are identically constructed in pairs, are caused to vibrate by means of an excitation arrangement placed in the middle region to achieve mass balance, so that they oscillate against one another, ie the oscillations of the two measuring tubes are 180 ° out of phase with one another.
  • a Coriolis mass flowmeter is flanged to a pipeline in a plant.
  • the piping may be subject to vibration and these vibrations may be transmitted to the flanged Coriolis mass flowmeter.
  • the problem is that these vibrations can affect the Coriolis mass flowmeter so that no correct measurement of the flow rate or the density of the flowing medium is guaranteed.
  • vibrations of piping are detected by means of a separate vibration meter.
  • no solutions are known which enable a Coriolis mass flowmeter to reliably detect such external vibrations in a reliable manner.
  • the NAMUR Recommendation NE 107 also mentions the detection of external vibrations as a fault condition for Coriolis mass flowmeters.
  • the invention is therefore based on the object to enable a Coriolis mass flowmeter to perform a self-diagnosis of occurring external vibrations.
  • the present invention provides a Coriolis mass flow meter and a method of operating a Coriolis mass flow meter. To that
  • vibration transducers on the device must be able to sense a wide frequency range, even outside an excitation frequency range of the device.
  • the vibration sensors according to the present invention are acceleration sensors whose measured value range is designed so that not only the excitation frequency range but also higher and lower frequency ranges can be detected well.
  • the Coriolis mass flowmeter further comprises at least one measuring tube, which is flowed through by a medium, at least one excitation arrangement, which is arranged in the central region of the at least one measuring tube and this excites to vibrations, and an evaluation device which is adapted to the to control at least one exciter arrangement and to receive vibration signals from the at least two acceleration sensors.
  • the at least one exciter arrangement acts as an actuator in order to set the at least one measuring tube in vibration.
  • the vibration signals detected by the acceleration sensors are then forwarded as raw signals to the evaluation device.
  • the at least two acceleration sensors are arranged in front of and behind the at least one exciter arrangement in the longitudinal direction of the at least one measuring tube.
  • the at least two acceleration sensors are arranged symmetrically, so that they have the same distance to the exciter arrangement in the longitudinal direction of the at least one measuring tube.
  • the vibration sensors are designed as coils.
  • these coils are not suitable for detecting external vibrations.
  • the sensitivity is not high enough and on the other hand, its frequency detection range is not large enough.
  • high frequency external vibrations can not be detected due to the common sampling rate.
  • increasing the sampling rate is undesirable because it would result in increased performance of the subsequent evaluation components.
  • acceleration sensors used in accordance with the present invention which are also known to those skilled in the art as accelerometers, are particularly well-suited for measuring vibrations because they can detect a wide frequency range and their accuracy usually in the percent or per mil range lies.
  • the acceleration sensors of the Coriolis mass flowmeter are piezoelectric acceleration sensors or microsystems, which are also known to the person skilled in the art as MEMS (micro-electro-mechanical system).
  • MEMS micro-electro-mechanical system
  • piezoelectric acceleration sensors piezoceramic sensor plates convert dynamic pressure fluctuations into electrical signals, which can be further processed accordingly.
  • the pressure fluctuation is generated by a mass attached to the piezoceramic and acts on the piezoceramic with an acceleration of the overall system.
  • Microsystems are miniaturized accelerometers made of silicon.
  • These micro-electro-mechanical sensors are spring-mass systems in which the springs are usually only a few microns wide silicon webs and the mass
  • Silicon is made. Due to the deflection during acceleration, a change in the electrical capacitance can be measured between the spring-suspended part and a fixed reference electrode. Microsystems are very reliable and inexpensive to manufacture and have a very high
  • Measurement speed Furthermore, they are able to detect a wide frequency range, which is why they are suitable as a vibration sensor of a Coriolis mass flowmeter.
  • the at least two acceleration sensors detect a frequency range around an excitation frequency for the excitation arrangement and frequency ranges above and / or below the excitation frequency range.
  • the excitation frequency range is to be understood as the frequency range around the excitation frequency.
  • acceleration sensors such as eg piezoelectric acceleration sensors or microsystems, can be designed in such a way that, in addition to the excitation frequency range, they can also detect higher and lower frequency ranges.
  • acceleration sensors are able to detect frequencies between 0 Hz (static case) and about 50 kHz, where they do not work linearly in the entire frequency range.
  • the special case of 0 Hz can be detected, for example, with MEMS, but not with piezoelectric acceleration sensors.
  • the excitation frequency depends on the one hand on the Coriolis mass flowmeter used (eg 100 Hz or 600 Hz, depending on the manufacturer) and on the other hand on the medium flowing through the measuring tube. If, for example, the excitation frequency for an air-filled Coriolis mass flowmeter is 600 Hz, then the excitation frequency is only about 550 Hz when water flows through the device.
  • the at least two acceleration sensors are arranged to detect an excitation frequency range which is between 500 and 750 Hz when the excitation frequency is about 600 Hz.
  • the acceleration sensors are arranged to additionally detect the frequency range above the excitation frequency range, which is between 800 Hz and 30 kHz, and / or to detect the frequency range below the excitation frequency range which is between 0 and 400 Hz.
  • the frequency ranges mentioned here are merely exemplary in that, as mentioned, the excitation frequency range can vary depending on the Coriolis mass flowmeter used and the medium through which this device flows.
  • the frequency ranges to be detected above and / or below the excitation frequency range to be adjusted accordingly.
  • the use of acceleration sensors as vibration transducers ensures that in an operating mode in addition to the detection of the excited vibration, further frequency bands can be detected, which can provide information about external vibrations.
  • the evaluation device therefore comprises means for determining interference signals in the detected frequency ranges. That is, the means for detecting interference signals provide the Information about possible external vibrations, by performing a corresponding filtering of the raw signals of the vibration sensor.
  • Interference signals in the detected frequency range above the excitation frequency range are preferably determined by means of envelope formation.
  • the envelope formation means that, in a first step, low-frequency signal components are removed from the raw signals of the vibration sensors by means of a high-pass filter, wherein the cut-off frequency must lie above the frequency range of the useful signal. Subsequently, the high-pass filtered signal is rectified and low-pass filtered to form an envelope of the high-frequency interference signal.
  • a high-frequency interference signal can be determined, which superimposes the low-frequency useful signal, which is generated by the excitation by the actuator.
  • High-frequency interference signals can be caused, for example, by periodic impacts on the pipeline to which the Coriolis mass flowmeter is flanged.
  • Noise signals in the detected frequency range below the excitation frequency range are preferably determined by means of low-pass filtering. That is, the raw signals of the vibration sensor are subjected to a low-pass filtering, so as to separate the useful signal and to determine noise components with a smaller frequency than the useful signal.
  • the determination of interference signals with a higher or lower frequency than the useful signal can be carried out in parallel or sequentially, wherein the evaluation device, which preferably performs the described filtering, must be adapted accordingly. In the case of sequential filtering, it does not matter in what order the filtering is performed. In particular, the determination of interference signals in the frequency ranges above and / or below the excitation frequency range parallel to the normal operation of the Coriolis mass flow measuring device, ie parallel to a mass flow and density measurement of a flowing medium.
  • interference signals are determined within the excitation frequency range, ie within the frequency range in which the excitation of the Coriolis mass flowmeter is located. Then, the evaluation device must switch off the excitation arrangement for a predetermined period of time, so that the mass flow can not be measured in this time interval.
  • the determination of interference signals and thus external vibrations in the excitation frequency range is possible due to the high sensitivity of acceleration sensors described above.
  • the interference signals can be obtained from the raw signals of the acceleration sensors by means of the measurement chain described above, consisting of envelope formation and low-pass filtering. However, suitable bandpass filtering can also be used. If the excitation frequency for the excitation arrangement is, for example, in the range of 600 Hz, then a frequency range between 400 and 800 Hz is preferably investigated when determining interference signals in the excitation frequency range.
  • the Coriolis mass flowmeter by replacing conventional vibration sensors (eg coils) of a Coriolis mass flowmeter with acceleration sensors, frequency ranges can be detected in addition to an excitation frequency range, in which usually external vibrations are present and which can not or only with difficulty be detected with conventional vibration transducers.
  • This makes it possible to implement a self-diagnosis of the Coriolis mass flowmeter via occurring external vibrations in a pipeline to which the device is flanged.
  • the Coriolis mass flowmeter according to the invention is capable of self-monitoring with respect to external vibrations (shocks, vibrations, etc.). Based on this self-diagnosis, valuable find out all about the process safety of the Coriolis mass flowmeter.
  • the Coriolis mass flowmeter has two measuring tubes, another advantage can be achieved by replacing the conventional vibration sensors with acceleration sensors.
  • a total of four acceleration sensors are required, of which two acceleration sensors in each case in the longitudinal direction of the measuring tubes in front of and behind the excitation arrangement are mounted on a measuring tube.
  • sensor pairs are mounted in front of and behind the exciter arrangement in the longitudinal direction of the measuring tubes. Then, by means of a sensor pair, an asymmetrical flow through the measuring tubes or a blockage in one of the measuring tubes can already be detected by appropriate evaluation of the oscillation signals of each of the acceleration sensors of the sensor pair. For this purpose, the vibration signals of the two acceleration sensors of a sensor pair only have to be compared with each other.
  • the Coriolis mass flowmeter comprises a digital signal processor adapted to sample (A / D conversion) and correlate the detected spurious signals.
  • the vibration signals obtained from the vibration pickups are sampled and plotted in the input digital signal processor. From the sampled vibration signals, the digital signal processor then determines the interference signals, which are then correlated.
  • the digital signal processor is equipped with the appropriate means to determine the noise in the detected frequency ranges. That is, according to this alternative embodiment, the above-described filtering of the raw signals of the acceleration sensors is implemented as software in the digital signal processor. Otherwise, the
  • appropriate hardware eg RC elements
  • the correlation it would also be possible for the correlation to be carried out analogously so that a sampling of the filtered interference signals of the at least two acceleration sensors is omitted and the filtered interference signals are correlated.
  • the sampling frequency When sampling the filtered raw signals, the sampling frequency must be above the excitation frequency. As in conventional devices, the sampling frequency is between 10 to 20 times, preferably 15 times higher than the excitation frequency. Such a sampling rate allows a good interpolation of the measured values, e.g. to be able to conclude zero crossings. Thus, in contrast to conventional devices, the sampling rate does not have to be increased in order to be able to carry out a diagnosis with regard to external vibrations, so that no increased power and no additional energy consumption of the evaluation components is required.
  • the present invention relates to a system having at least one pipeline to which at least one Coriolis mass flowmeter according to the invention is flanged.
  • FIG. 1 shows a Coriolis mass flowmeter according to a preferred embodiment of the present invention.
  • 2 schematically shows a digital signal processor of the Coriolis mass flowmeter of FIG. 1 according to an embodiment of the present invention.
  • FIG. 3 shows a flowchart of a method according to an embodiment of the present invention.
  • FIG. 1 shows a Coriolis mass flow meter according to a preferred embodiment of the present invention pelg.
  • the mass flowmeter 1 according to FIG. 1 operates on the Coriolis principle.
  • a first measuring tube 2 and a second measuring tube 3 are arranged substantially parallel to one another. They are usually made from one piece by bending.
  • the course of the measuring tubes is essentially U-shaped.
  • a flowable medium flows according to an arrow 4 in the mass flow meter 1 and thus in the two located behind a not visible in the figure inlet splitter inlet sections of the measuring tubes 2 and 3 and corresponding to an arrow 5 from the outlet sections and the behind, also in the figure invisible spout splitting off again.
  • a stiffening frame 7 By a stiffening frame 7, the geometry of the measuring tubes 2 and 3 is kept substantially constant, so that even changes in the piping system, in which the mass flowmeter 1 is installed, for example, due to temperature fluctuations, possibly lead to a small zero shift.
  • Exciter arrangement 8 which may for example consist of a magnet coil attached to the measuring tube 2 and a magnet immersed in the magnet tube, which serves to generate mutually opposite oscillations of the two measuring tubes 2 and 3 whose frequency corresponds to the natural frequency of the magnet Substantially U-shaped center portion of the measuring tubes 2 and 3 corresponds.
  • Acceleration sensors 9 shown diagrammatically in FIG. 1 serve to detect the Coriolis forces and / or the vibrations of the measuring tubes 2 and 3, which are based on the Coriolis forces and which arise due to the mass of the medium flowing through.
  • each an acceleration sensor in the longitudinal direction of the one measuring tube in front of and behind the exciter arrangement.
  • the Coriolis mass flowmeter shown in Figure 1 has two measuring tubes, so that a total of four acceleration sensors are necessary. Of these, two acceleration sensors each are mounted on a measuring tube in front of and behind the actuator 8. For the sake of clarity, the individual acceleration sensors in front of and behind the actuator 8 are not shown individually but each sensor pair is shown as a unit, even if the two acceleration sensors of each sensor pair operate independently of each other.
  • the vibration signals 10, which are generated by the acceleration sensors 9, are evaluated by an evaluation device 11.
  • the evaluation device 11 comprises a digital signal processor 12, which will be described in detail later with reference to FIG. Results of the evaluation are output on a display 13 or via an output, not shown in the figure, e.g. Fieldbus, transmitted to a higher-level control station.
  • the evaluation device 11 also takes over the control of the exciter arrangement 8 in the exemplary embodiment shown.
  • the measuring tubes 2 and 3 may of course have other geometries, such as a V-shaped or a ⁇ -shaped center section, or it may be a different number and arrangement of exciter arrangements and acceleration sensors are selected.
  • the Coriolis mass flow meter may alternatively have a different number of measuring tubes, For example, a measuring tube or more than two measuring tubes possess.
  • FIG. 2 schematically shows the digital signal processor 12 of the Coriolis mass flowmeter of FIG. 1 according to an embodiment of the present invention.
  • the entire evaluation chain for the vibration signals 10 of the acceleration sensors 9 is implemented in software.
  • the raw signals 10 of the acceleration sensors 9 pass through separate evaluation chains.
  • FIG. 2 shows only the processing steps for a frequency range above the excitation frequency range. Processing steps, ie the corresponding filterings, for other frequency ranges can additionally or alternatively be implemented in the digital signal processor.
  • the vibration signals 10 of the acceleration sensors 9 are sampled (A / D conversion) by scanning means 14 so as to be recognized and processed by the digital signal processor 12, and input to the corresponding input of the digital signal processor 12.
  • envelope shaping is performed within the digital signal processor 12 by passing the sampled oscillation signals through a high pass filter 15, a rectifier 16, and a low pass filter 17.
  • the low-pass filter 17 then outputs the respective envelope of the high-frequency components of the sampled oscillation signals.
  • the envelopes are then entered into a correlation means 18.
  • the correlation means 18 performs a
  • an evaluation device of a Corio receives lis mass flowmeter Vibration signals from acceleration sensors of the device, which detect a frequency range around an excitation frequency and frequency ranges above and / or below the excitation frequency range.
  • the vibration signals are subjected to filtering in order to filter interference signals from the vibration signals.
  • the interference signals are sampled.
  • the sampled interference signals are correlated in order to verify a diagnostic message which can be derived from the interference signals.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un débitmètre massique à effet Coriolis (1), et un procédé pour faire fonctionner un débitmètre massique à effet Coriolis. Ce débitmètre massique à effet Coriolis (1) comporte au moins un tube de mesure (2,3) traversé par une substance, au moins un dispositif d'excitation (8) qui est disposé dans la zone centrale du/des tube(s) de mesure (2, 3) et met ce tube en vibration, par excitation, au moins deux capteurs de vibration (9) qui sont disposés à l'avant et à l'arrière du/des dispositif(s) d'excitation (8) dans la direction longitudinale du/des tube(s) de mesure, et un dispositif d'analyse (11) conçue pour commander le(s) dispositif(s) d'excitation (8) et recevoir des signaux d'oscillation provenant desdits capteur(s) de vibration (9). Les capteurs de vibration (9) se présentent sous la forme de capteurs d'accélération qui détectent une gamme de fréquences proche de la fréquence d'excitation du dispositif d'excitation (8) ainsi que des gammes de fréquence se trouvant au-dessus et/ou en dessous de la gamme de fréquences d'excitation.
PCT/EP2009/000548 2009-01-28 2009-01-28 Débitmètre massique à effet coriolis, et procédé de fonctionnement correspondant WO2010085972A1 (fr)

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PCT/EP2009/000548 WO2010085972A1 (fr) 2009-01-28 2009-01-28 Débitmètre massique à effet coriolis, et procédé de fonctionnement correspondant

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PCT/EP2009/000548 WO2010085972A1 (fr) 2009-01-28 2009-01-28 Débitmètre massique à effet coriolis, et procédé de fonctionnement correspondant

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012031843A1 (fr) * 2010-09-10 2012-03-15 Endress+Hauser Flowtec Ag Procédé pour détecter une obstruction dans un débitmètre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0754934A1 (fr) * 1995-07-21 1997-01-22 Endress + Hauser Flowtec AG Débimètre massique selon le principe de coriolis comprenant au moins un tube de mesure
WO1998020306A1 (fr) * 1996-11-08 1998-05-14 Schlumberger Industries, Inc. Traitement numerique de signaux par boucle a phase asservie pour debitmetre-masse a acceleration de coriolis
EP1480019A1 (fr) * 2003-05-19 2004-11-24 Helios + Zaschel GmbH Procédé et dispositif pour la mesure d'un débit massique
WO2006056518A2 (fr) * 2004-11-04 2006-06-01 Endress+Hauser Flowtec Ag Capteur de mesure de type vibratoire
US20070180929A1 (en) * 2005-12-27 2007-08-09 Endress + Hauser Flowtec Ag In-line measuring devices and method for compensation measurement errors in In-line measuring devices
DE102007061690A1 (de) * 2006-12-21 2008-06-26 Abb Ag Verfahren zum Betrieb eines Messgerätes vom Vibrationstyp sowie Messgerät von Vibrationstyp selbst

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0754934A1 (fr) * 1995-07-21 1997-01-22 Endress + Hauser Flowtec AG Débimètre massique selon le principe de coriolis comprenant au moins un tube de mesure
WO1998020306A1 (fr) * 1996-11-08 1998-05-14 Schlumberger Industries, Inc. Traitement numerique de signaux par boucle a phase asservie pour debitmetre-masse a acceleration de coriolis
EP1480019A1 (fr) * 2003-05-19 2004-11-24 Helios + Zaschel GmbH Procédé et dispositif pour la mesure d'un débit massique
WO2006056518A2 (fr) * 2004-11-04 2006-06-01 Endress+Hauser Flowtec Ag Capteur de mesure de type vibratoire
US20070180929A1 (en) * 2005-12-27 2007-08-09 Endress + Hauser Flowtec Ag In-line measuring devices and method for compensation measurement errors in In-line measuring devices
DE102007061690A1 (de) * 2006-12-21 2008-06-26 Abb Ag Verfahren zum Betrieb eines Messgerätes vom Vibrationstyp sowie Messgerät von Vibrationstyp selbst

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012031843A1 (fr) * 2010-09-10 2012-03-15 Endress+Hauser Flowtec Ag Procédé pour détecter une obstruction dans un débitmètre
US8857270B2 (en) 2010-09-10 2014-10-14 Endress + Hauser Flowtec Ag Method for detecting plugging in a Coriolis flow measuring device

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