EP2215432A1 - Système de mesure notamment destiné à mesurer le débit d'un fluide de mesure s'écoulant dans une conduite tubulaire - Google Patents

Système de mesure notamment destiné à mesurer le débit d'un fluide de mesure s'écoulant dans une conduite tubulaire

Info

Publication number
EP2215432A1
EP2215432A1 EP08853911A EP08853911A EP2215432A1 EP 2215432 A1 EP2215432 A1 EP 2215432A1 EP 08853911 A EP08853911 A EP 08853911A EP 08853911 A EP08853911 A EP 08853911A EP 2215432 A1 EP2215432 A1 EP 2215432A1
Authority
EP
European Patent Office
Prior art keywords
temperature
measuring
functional
medium
tube
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Withdrawn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
EP08853911A
Other languages
German (de)
English (en)
Inventor
Andreas Berger
Achim Wiest
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 EP2215432A1 publication Critical patent/EP2215432A1/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Withdrawn legal-status Critical Current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
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • 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
    • G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details

Definitions

  • Measuring system in particular for flow measurement of a flowing in a pipeline medium
  • the present invention relates to a measuring system, in particular for
  • Flow measurement of a flowing in a pipe measuring medium, in particular a fluid which measuring system comprises a measuring tube and at least two holding elements for holding at least one functional component, in particular for holding sensors, which each functional components have at least one functional surface comprises, which measuring tube comprises a support tube which holding elements are in each case connected to the carrier tube at at least one connecting surface and in each case two mutually opposite connecting surfaces of the holding elements have a distance Y and two respective opposing functional surfaces of the functional components, which are held in the holding elements, have a distance X.
  • measuring systems in particular from the magnetic inductive flow measurement or from the flow measurement based on ultrasound known, where at least two sensors face each other, wherein at least one sensor picks up a measurement signal, which depends inter alia on the distance of the sensors. There is a signal path between the sensors.
  • US7044001 B2 describes an ultrasonic flowmeter wherein two ultrasonic sensors are spaced apart at an angle to a support tube on which the sensors are mounted. A signal which is emitted by a first sensor in the direction of a second sensor, the speed of the flow of the measuring medium flowing in the support tube is determined by this receiving and the propagation times of the signal.
  • Ultrasonic flowmeters are widely used in process and automation technology. They allow in a simple manner, the volume flow in a pipeline to determine contactless.
  • the known ultrasonic flowmeters often work after the Doppler or after the transit time difference principle.
  • ultrasonic pulses are sent both in and against the flow.
  • the runtime difference can be used to determine the flow velocity and, with a known diameter of the pipe section, the volume flow rate.
  • the ultrasonic transducers normally consist of a piezo element, also called piezo for short, and a coupling element, also known as a coupling wedge or, more rarely, a precursor body, made of plastic.
  • a piezoelectric element In the piezoelectric element, the ultrasound is generated and guided via the coupling element to the pipe wall and from there into the liquid. Since the speeds of sound in liquids and plastics are different, the ultrasonic waves are refracted during the transition from one medium to another. The refractive angle is determined by Snell 's law. The angle of refraction is thus dependent on the ratio of the propagation velocities in the two media.
  • the coupling element is aligned on the pipe or in a sensor holder attached to the pipe.
  • WO03 / 006932A1 shows the structure of an ultrasonic sensor.
  • the materials from which the coupling elements are made usually have certain properties to conduct ultrasonic signals, at the same time they usually have a higher thermal expansion than the sensor sleeve. They are firmly inserted into the sensor sleeve or potted in this, in order to prevent a temperature-induced expansion of the coupling elements.
  • coupling element and sensor sleeve form a contact surface.
  • the measurement error due to a temperature expansion of the measuring tube or the sensors themselves ie the temperature dependence of the measurement of the geometric dimensions of the measuring system, in particular the distance of the sensors from one another and thus the signal path, did not receive any attention.
  • the object of the invention is to propose a measuring system for measuring a fluid flowing in a pipeline or in a measuring tube, which has a high measuring accuracy over a wide temperature range.
  • measuring system in particular for flow measurement of a flowing in a pipeline medium, in particular a fluid
  • which measuring system a measuring tube and at least two holding elements for holding in each case at least one functional component, in particular for holding sensors, which functional Components each have at least one functional surface
  • a measuring system thus has n holding elements, where n is an element of the natural numbers.
  • Geometries and material-own sizes of the holding elements and / or geometries and material-own sizes of the functional components and geometries and substance-own sizes of the support tube are coordinated so that relative distances x functional surfaces of the functional components in Dependence of a temperature T of flowing through the measuring tube
  • a geometry characterizes the structural design, in particular size and shape, of a body.
  • density or porosity in the case of open or closed-pore structures are also determined by the geometry.
  • material-specific quantities can change over time and / or via further parameters, in particular via temperature. They are usually calculated using functions, including material constants as coefficients.
  • thermal expansion, or thermal expansion is usually described by ⁇ , as most physical quantities are not linear.
  • the basic idea of the invention is the construction of the holding elements and / or the functional components of at least two materials whose thermal expansions are different from each other.
  • the invention can also be used in FüNstandsteil.
  • the shape of the measuring tube is not limited to a circular cross-section. Rectangular tubes or other known from the level measurement container container can be configured according to the invention. Due to the temperature-dependent adjustment of the distance of the functional surfaces, temperature-related measurement errors can be reduced, which would occur in a measuring system where the material's own sizes in relation to the geometry of the measuring system are not sufficiently taken into account in the design of the measuring system according to the invention.
  • the settings of the spacings of respectively two functional surfaces can lead to a reduction of a measuring error or the division of several opposing functional surface pairs contributes to the mentioned compensation , which can experience quite different Abstandsä ⁇ derept, so the interaction of different distance changes leads to the measurement error reduction.
  • Functional surfaces may be, for example, the sound exit or the sound output surface of the coupling elements in ultrasonic sensors, the Schalfeintritts- or the Schalleinkoppel friendship the Koppeleiemente or the piezoelectric elements or magnetically inductive flow meters, the opposing electrode surfaces.
  • the wide temperature range is the range in which the thermal expansions can be predicted or predicted, in particular the range in which the linear laws of thermal expansion and stiffness apply and can be assumed. The limits are substance-dependent.
  • the essential idea of the invention is to match the geometric relationships of sensor and carrier tube and their properties with respect to their expansion over the temperature so that the influence of the temperature of the measuring tube is reduced to the measurement.
  • the effects of different expansion over temperature of support tube and retaining element and / or functional component compensate each other in the ideal case.
  • the support tube and the holding member made of a first material and the functional component consists of a second material, wherein both materials differ and the coefficients of thermal expansion of both Materiaien and the geometric dimensions of the support tube and retaining element and functional component are coordinated accordingly.
  • this can be changes both in the radial direction of the measuring tube and in the axial direction. As a result, the measuring accuracy is less dependent on the temperature of the medium to be measured.
  • the material of the functional component such as a Ultraschallkoppeielements is no longer selected purely for manufacturing aspects or the quality of the sound-influencing properties, but the geometric dimensions of the functional component and / or the support member are dependent on the ratio of the geometric dimensions of the support tube and / or the Halteeiements, the substance-own sizes of the material of the support tube and / or the holding element and the intended use of the measuring system.
  • the temperature expansion coefficients are included for material selection.
  • Thermal expansion coefficient of the functional component support tube and / or the holding element is a function of the coefficient of thermal expansion of the support tube and / or the holding element.
  • the sound velocities in coupling elements, carrier tube and / or measuring medium are relevant for the measurement with an ultrasonic flowmeter, the electrical conductivities for a magneto-inductive measuring device. However, some of these are known or a prerequisite for the material used or they can be determined during or shortly before the actual measurement. Thus, they are not relevant to the geometric design of the measuring system in the production of the measuring system according to the invention.
  • the support tube expands upon heating or cooling in a certain dependence on the temperature difference around which it is heated or cooled, and on material-own sizes of the material of which the support tube consists, and on the geometric conditions of the support tube.
  • a technically qualified person is usually known in this context as the term expansion, although cooling is actually a shrinkage.
  • retaining elements which are fixedly mounted on the support tube and / or functional components expand. If the material of the functional component has a higher thermal expansion compared to the support tube and / or the holding element at the same temperature difference, the functional component expands more, so to a greater extent. Since the expansion of the functional component is limited at least in one direction by the retaining element or by the fastening in the retaining element, the functional component expands in a desired direction.
  • the material's own sizes are to be matched to the existing geometries.
  • the measurement deviation due to the temperature-induced expansion of the support tube is, as already described, reduced by the deviating from the support tube expansion over temperature of the functional component and / or the Halteeiements.
  • the invention enables cost-effective high measurement accuracy in comparison with the prior art Achieve technology. But also in the level measurement, the measuring system according to the invention can be used advantageously.
  • isotropic materials may be used or anisotropic materials may be used for the production of the functional component and / or for the production of the support element and / or for the production of the support tube, in particular with different inherent sizes, e.g. axially and radially different coefficients of thermal expansion.
  • thermo-related measurement deviations in addition to the geometric changes of the measuring system, is the temperature dependence of the speed of sound in the medium to be measured, which leads to a measurement error, especially in ultrasound flow meters.
  • a further advantageous embodiment of the device according to the invention is to be seen in that the holding elements have a tempering device, whereby a predetermined temperature of the holding elements and / or the functional components attached to the holding elements is adjustable.
  • the tempering device can be located in the holding element and / or on the holding element, in particular around the holding element around. In particular in the case where sensors are attached to the holding elements and functional components of the sensors or their distance from each other are to be aligned, If the sensors are to be tempered, it is preferable for temperature control devices to be mounted in and / or on and / or around the sensor housing.
  • the temperature of the temperature control device is controlled by the temperature of the medium to be measured as a controlled variable or it depends on the time course of the temperature of the medium and / or the temperatures in the support tube and / or the temperature of the environment of the measuring system.
  • tempering are conceivable.
  • Cooling or heating fluids in particular in connection with at least one
  • Temperature sensor which determines the temperature of the medium used.
  • X (T 0 ) functional components at a temperature change AT-TT 0 of the measuring medium, starting from an initial temperature T 0 of the measuring medium, is smaller than a relative change AY (T) - ⁇ (T) - ⁇ ( ⁇ o ) of the distance of the connecting surfaces of
  • the distance of opposing functional surfaces of the functional components is approximately constant over a wide temperature range or a distance of, the measuring medium facing sides of, on the functional surfaces of bodies attached to functional components is approximately constant over a wide temperature range, or a distance of sides or surfaces of the bodies, in particular sensors, which are attached to the functional surfaces of the functional components is approximately constant over a wide temperature range.
  • n is the natural number element and in each case two connecting surfaces q and r, which have a distance Y qr and two functional surfaces q and r, respectively, which have a distance X qr , wherein associated holding elements,
  • Connecting surfaces, functional components and functional surfaces each have the same index, i. wherein Haiteeiement i is connected to the support tube at the joints i, the functional component i with the functional surfaces i in turn is supported by the holding element i and i- 1, ..., n, are geometries and material-own sizes of the Haiteiata and / or geometries and In-house sizes of the functional components and geometries and material-specific sizes of the support tube are coordinated so that a relative
  • ⁇ qrU ⁇ ) functional components at a temperature change ⁇ T T-To of the measured medium, starting from an initial temperature T 0 of the Meßmedäums, less than 50%, preferably less than 20%, in particular less than 10%, in particular less than 5%, in particular less than 2%, in particular less than 1%, is, as a relative change
  • sensors such as ultrasonic wall mounted on the holding elements
  • the distance between the functional components or the functional surfaces of the sensors such as piezoelectric layers or the surface of the sound outlet from the sensor into the measuring medium, which emit and receive the Uftraschallsignal over a wide temperature range approximately constant.
  • opposing sensors which face each other in particular axially, in particular in a measuring tube for flow measurement, a in a wide temperature range approximately the same distance and thus one approximately the same signal path.
  • a temperature-related measurement deviation as occurs in the prior art by changing the signal path under the influence of temperature, is significantly reduced.
  • Inner diameter for example, a lined with a liner carrier tube, this is among other things particularly advantageous for ultrasonic flow measuring devices, which measure the transit time parallel to the flow direction of the medium.
  • the distance of the sensors over a wide temperature range can be kept constant, but by the extension of the support tube is Messfehier introduced into the calculation of the flow. If the free cross section of the measuring tube or its clear width is kept constant, the measurement error is substantially reduced. But also in the level measurement, the measuring tube according to the invention can be advantageously used. Thus, the distance of sensors or the length of a signal path can be kept approximately constant, as e.g. also with magnetic inductive flowmeters or optical measuring devices.
  • the flow measuring system operates on the basis of ultrasound and comprises at least two ultrasonic sensors spaced apart from one another parallel to the main flow direction of the measuring medium in a measuring tube, wherein the inner diameter of the
  • Measuring tube is approximately constant over a wide temperature range and wherein the distance of the functional surfaces of the sensors over a wide temperature range is approximately constant.
  • the functional surfaces of the ultrasonic sensors are the ends of the leading bodies of the ultrasonic sensors. They fulfill the function of the transmission of the sound from the sensor to the measuring medium and back.
  • the Voriauf stresses are preferably fixed in a metal sleeve, which in turn serves as a holding element, wherein the fixing of the flow body in the metal sleeve is designed so that the flow body can expand freely in the direction of the opposite sensor, so the sensors each at the, the opposite end facing away from the sensor body to the holding element, ie in the metal sleeve, are fixed.
  • the flow body itself thus represents a functional component with the sound output surface as a functional surface.
  • An alternative is the fixation of the ultrasonic sensor to a holding element, wherein the sensor facing away from the opposite end of a sensor is fixed to the holding element.
  • the flow body is the distance-compensating functional component, a lining of a support tube comparable or accepting their functionality, which compensates for the axial extent of the measuring tube and optionally the first part of the support member.
  • Such a Ultraschallail-Messzeiie can have very small dimensions and is therefore variable.
  • a flow measuring system wherein the distances of the functional surfaces of the sensors over a wide temperature range are approximately constant, the angle of the functional surfaces to each other but change over the temperature.
  • Pressure range is approximately constant.
  • the length of the central axis of the measuring tube inlet to the measuring tube outlet is referred to as the length of the measuring tube.
  • the Haiteeiemente can, in addition to sensors, for example, the tube ends closing plates, creating a hollow cylinder with a, over a wide temperature range constant volume.
  • the functional surface or the side of the functional component which faces the measuring medium is the side of the plate which points into the tube to the measuring medium.
  • the holding elements may in this case be designed as a plate itself.
  • Such a container with a, over a wide temperature range constant volume can be used in many areas. With it can be particularly advantageous measure a volume of a fluid.
  • Another expedient embodiment of the solution of the invention is that the distance of the functional surfaces of the sensors in dependence on the change in cross section of the measuring tube, that is, to the change in the inner diameter.
  • Fig. 1 shows a sectional view in the longitudinal direction of an inventive
  • Fig. 2 shows a sectional view in the longitudinal direction of an inventive
  • Fig. 3 shows a detailed view of a HaStelements in section.
  • Fig. 4 shows a detailed view of another holding element in section.
  • FIG. 1 shows a sectional view in the longitudinal direction of a measuring tube 1 according to the invention with holding elements 14 and functional components 28.
  • the holding elements 14 are made of a first material, the functional components 28 of a second material, the functional components 28 are preferably glued to the holding elements 14 or otherwise materially interconnected.
  • the Haiteimplantation 14 are firmly connected to the support tube and protrude into the interior of the measuring tube 1 in.
  • the material from which the holding elements 14, which are connected to the support tube 2, are made, is matched with the material of the support tube 2. Thereby, the radial extent of the support tube 2 is compensated and the holding elements 14, remain in the radial direction over a wide temperature range at the same position.
  • the material of the functional components 28, which compensate for the axial extent of the support tube 2, is also dependent on the material of the support tube 2. In addition, it depends on the material of the holding elements 14 and on the geometries of the components.
  • the functional components 28 have functional surfaces 16, the mutual distance 15 is dependent on the temperature-dependent thicknesses of the functional components 28 and the temperature-induced increase of the Haiteimplantation 14 in the axial direction of the support tube 2.
  • Thejansfiambaen 16 may have a, over a wide temperature range, the same distance 15 to each other, so that, for example when attaching sensors, a parallel signal path of constant length to the main flow direction of the measuring medium 4 is formed. On the other hand, their distance may also depend on the structure of the attached sensors.
  • Haiteimplantation 14 may be designed so that not have the functional surfaces 16 gieambaen distance, but functional surfaces of the sensors.
  • the geometry and the materials of the sheath elements 14 and the functional components 28 are thus additionally dependent on the geometry and the materials of the sensors applied to them.
  • FIG. 2 shows a longitudinal sectional view of an inline ultrasound measuring system according to the invention with an approximately constant distance 15 and an approximately constant angle of the functional surfaces 16 of the ultrasonic sensors to one another.
  • functional surfaces 16 the areas facing the measuring medium 4 and the mutually opposite surfaces of the flow body 24 are considered here.
  • piezo elements or other functional elements would be possible.
  • the flow body 24 are on the one hand part of the sensors and at the same time functional component.
  • Fig. 3 is a detail view of an ultrasonic sensor is shown.
  • the structure of a sensor is at least two parts, ie it consists of at least two joined parts, which consist of different materials.
  • the sensor sleeve 25 is the sensor sleeve 25 and the flow body 24.
  • the sensor sleeve 25 is cut and the flow body 24 shown uncut.
  • the sensor sleeve 25 is firmly connected to the support tube 2. It preferably consists of a material with a similar coefficient of thermal expansion as the support tube 2. It can also be made of the same material.
  • the sensor sleeve encloses the flow body 24 radially completely.
  • the flow body 24 is made of a different material than the sensor sleeve 25, in particular its thermal expansion is significantly higher, and it is preferably stoffschiüssig connected to the Sensorhüise 25, preferably via an adhesive surface 26, which extends circumferentially around the flow body.
  • the opposing between the two adhesive surfaces 26 parts of the flow body 24 of the two sensors can expand freely in the direction of the respective opposite sensor. It is achieved, the structural design of the flow body 24 depending on the materials used by Voriauf stresses 24, sensor sleeve 25 and support tube 2 and depending on the geometries of the sensor sleeve 25 and support tube 2 provided that the distance 15 of the two functional surfaces 16 of the Voriauf stresses 24 via a wide temperature range is approximately constant. Likewise, it can be achieved that the angles between the functional surfaces 16 of the sensors are approximately constant over a wide temperature range.
  • a bore 30 is provided in the measuring tube 1.
  • a first disc 31 is inserted with an opening 31 so that it closes the outside of the measuring tube 1 and a second disc with an opening 32 forms with the inside of the wall of the measuring tube 1 a conclusion.
  • a membrane 34 with a clamped body such as a therein gehaiterter lead body 24, introduced.
  • the membrane 34 is made of a different material than the measuring tube 1, can move between the discs 31 and 32 in the longitudinal direction of the measuring tube 1 and is designed so that the temperature-dependent longitudinal extent of the measuring tube 1 is compensated at the flow body 24.
  • the distance between two Voriauf emotions be kept approximately constant.

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

Abstract

L'invention concerne la construction d'un système de mesure à base d'au moins deux matériaux présentant des coefficients de dilatation thermique différents, de telle manière que divers écarts de mesure dus à la température, apparaissant en cas de construction conventionnelle du système de mesure, sont corrigés ou n'apparaissent pas du tout.
EP08853911A 2007-11-30 2008-12-01 Système de mesure notamment destiné à mesurer le débit d'un fluide de mesure s'écoulant dans une conduite tubulaire Withdrawn EP2215432A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710058132 DE102007058132A1 (de) 2007-11-30 2007-11-30 Messsystem, insbesondere zur Durchflussmessung eines in einer Rohrleitung strömenden Messmediums
PCT/EP2008/066558 WO2009068691A1 (fr) 2007-11-30 2008-12-01 Système de mesure notamment destiné à mesurer le débit d'un fluide de mesure s'écoulant dans une conduite tubulaire

Publications (1)

Publication Number Publication Date
EP2215432A1 true EP2215432A1 (fr) 2010-08-11

Family

ID=40469873

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08853911A Withdrawn EP2215432A1 (fr) 2007-11-30 2008-12-01 Système de mesure notamment destiné à mesurer le débit d'un fluide de mesure s'écoulant dans une conduite tubulaire

Country Status (3)

Country Link
EP (1) EP2215432A1 (fr)
DE (1) DE102007058132A1 (fr)
WO (1) WO2009068691A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010029119A1 (de) * 2010-05-19 2011-11-24 Endress + Hauser Flowtec Ag Verfahren zur Ermittlung des Durchflusses eines Mediums durch ein Messrohr
DE102012112516A1 (de) 2012-12-18 2014-06-18 Endress + Hauser Flowtec Ag Verfahren zur Verifizierung der Zuverlässigkeit von ermittelten Messdaten einer Ultraschall-Durchflussmessung nach der Laufzeitdifferenz-Methode und Ultraschalldurchflussmessgerät
DE102012112522A1 (de) 2012-12-18 2014-06-18 Endress + Hauser Flowtec Ag Verfahren zur Bestimmung einer Strömungsgeschwindigkeit oder eines Durchflusses eines Messmediums durch ein Ultraschalldurchflussmessgerät
CN105444825B (zh) * 2014-05-31 2019-06-14 通用电气公司 超声装置以及用该超声装置来测量流体流量的方法
DE102018126613B4 (de) * 2018-10-25 2022-08-11 Sensus Spectrum Llc Messvorrichtung zur Bestimmung des Durchflusses eines durch einen Rohrabschnitt hindurchströmenden Fluids

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US4452090A (en) * 1982-05-17 1984-06-05 Airco, Inc. Ultrasonic flowmeter
DE4409148C3 (de) * 1994-03-17 2002-06-13 Leitz Mestechnik Gmbh Vorrichtung zur Längenmessung
DE19530807C2 (de) * 1995-08-22 1999-11-18 Krohne Ag Basel Verfahren zur Bestimmung des Volumendurchflusses von strömenden Medien
SE9803750L (sv) * 1998-11-03 2000-06-05 Jerker Delsing Anordning för temperaturkompensering av längdförändring hos en akustisk flödesmätare.
DE10133395A1 (de) 2001-07-13 2003-01-23 Flowtec Ag Messkopf für ein Ultraschall-Durchflussmessgerät
DE10314916A1 (de) * 2003-04-01 2004-10-21 Endress + Hauser Flowtec Ag, Reinach Vorrichtung zur Bestimmung und/oder Überwachung des Volumen- und/oder Massenstroms eines Mediums
US7044001B2 (en) 2004-03-26 2006-05-16 Endress + Hauser Flowtec Ag Sonic- or ultrasonic flowmeter
DE102004019390A1 (de) * 2004-04-19 2005-11-03 Endress + Hauser Flowtec Ag, Reinach Vorrichtung zum Temperieren eines In-Line-Meßgeräts
DE102006012114A1 (de) * 2006-03-14 2007-09-20 Endress + Hauser Flowtec Ag Vorrichtung zur Bestimmung und/oder Überwachung des Volumen- oder des Massedurchflusses eines Mediums in einer Rohrleitung

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Title
See references of WO2009068691A1 *

Also Published As

Publication number Publication date
WO2009068691A1 (fr) 2009-06-04
DE102007058132A1 (de) 2009-06-04

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