EP2457067A1 - Convertisseur de mesure de type à vibrations ainsi qu appareil de mesure doté d un tel convertisseur de mesure - Google Patents

Convertisseur de mesure de type à vibrations ainsi qu appareil de mesure doté d un tel convertisseur de mesure

Info

Publication number
EP2457067A1
EP2457067A1 EP10726082A EP10726082A EP2457067A1 EP 2457067 A1 EP2457067 A1 EP 2457067A1 EP 10726082 A EP10726082 A EP 10726082A EP 10726082 A EP10726082 A EP 10726082A EP 2457067 A1 EP2457067 A1 EP 2457067A1
Authority
EP
European Patent Office
Prior art keywords
transducer
measuring
measuring tube
esp
vibration
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Withdrawn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
EP10726082A
Other languages
German (de)
English (en)
Inventor
Christian Schütze
Christof Huber
Vivek Kumar
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 EP2457067A1 publication Critical patent/EP2457067A1/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Withdrawn legal-status Critical Current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
    • G01F1/845—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
    • 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

Definitions

  • the invention relates to a transducer of the vibration type with at least one in operation about a vibration axis, such as in a bending vibration mode, oscillating measuring tube for guiding flowing medium, such as a gas and / or a liquid, and a detection of vibrations of the measuring tube serving sensor assembly, the Vibrations of the at least one measuring tube representing primary signals supplies. Furthermore, the invention relates to, for example, as a compact meter and / or a Coriolis Masse matfluß- meter trained measuring device, for flowable media, with such a transducer and an electrically coupled with this meter electronics for processing supplied by the transducer primary signals and Generation of measured values.
  • a mass flow rate for example, a mass flow rate, a density, a viscosity or another
  • Measuring transducers such as a Coriolis mass flow meter, formed - measuring systems have long been known and have proven themselves in industrial use. Examples of such measuring systems with a transducer of the vibration type or even individual components thereof, are e.g. in EP-A 317 340, EP-A 848 234, JP-A 8-13631 1, JP-A 9-015015, US-A 2007/01 19264, US-A 2007/0119265, the US-A 2007/0151370, US-A 2007/0151371, US-A
  • Each of the transducers shown therein comprises at least one substantially straight or at least one, for example U-shaped or V-shaped, curved measuring tube, for example made of
  • Stainless steel, titanium, zirconium or tantalum for guiding the, possibly also extremely cold or extremely hot, medium.
  • a vibration length extending at least one measuring tube during operation of the measuring system about an imaginary connecting the two ends imaginary axis of vibration, esp flexural mode.
  • Vibration type therefore, further includes an electrical drive signal generated in operation by one of the mentioned driver circuits of the meter electronics and conditioned accordingly, e.g. a regulated current, driven exciter arrangement which excites the at least one measuring tube by means of at least one in operation of a current flowing directly to the measuring tube electro-mechanical, esp. Electro-dynamic vibration exciter to mechanical vibrations, such as bending vibrations, and extent supplied by the meter electronics in the transducer electrical power into mechanical
  • transducers comprise a sensor arrangement with at least two, esp. Electro-dynamic and / or identical, vibration sensors for at least selectively detecting inlet-side and Auslenfiner oscillations of the at least one measuring tube, esp. Those in Coriolis mode, and for generating of to be detected
  • Process parameters such as mass flow rate, total mass flow or density, affected sensor electrical signals as primary signals of the transducer.
  • the so-called drive or Nutzmode - is usually chosen in transducers with curved, eg U-, V- or ⁇ -like, measuring tube that natural mode in which the measuring tube at least partially at a lowest natural resonant frequency by an imaginary Longitudinal axis of the transducer oscillates in the manner of a cantilever clamped at one end, whereby in the medium flowing from the mass flow dependent Coriolis forces are induced.
  • these Coriolis force-forced cantilever oscillations in Coriolis mode usually correspond to those natural vibration modes in which the measuring tube also executes torsional vibrations about an imaginary torsional vibration axis oriented perpendicular to the longitudinal axis.
  • such a useful mode is often selected for generating mass flow-dependent Coriolis forces, in which the measuring tube carries out bending oscillations substantially in a single imaginary plane of vibration, so that the oscillations in the Coriolis mode are correspondingly designed as bending vibrations of the same oscillation frequency that are coplanar with the useful mode oscillations are.
  • the oscillating length thus more practically corresponds to a stretched length of an axis extending between the two aforementioned nodes, essentially
  • the means of the sensor arrangement on the inlet side and outlet side detected vibrations of the vibrating measuring tube on a dependent on the mass flow, measurable phase difference.
  • the measuring tubes are made of such, e.g. used in Coriolis Masse matflußmessem, transducer in operation at a momentary natural resonant frequency of the selected mode for the mode of vibration, esp. At constant-controlled oscillation amplitude, excited. Since this resonant frequency is particularly dependent on the instantaneous density of the medium, can by means of
  • Coriolis mass flow meter in addition to the mass flow additionally the density of flowing media are measured. Further, it is also possible, as shown for example in US-B 66 51 513 or US-B 70 80 564, by means of transducers of the vibration type, to directly measure the viscosity of the medium flowing through, for example based on an excitation power required for the excitation of the vibrations ,
  • transducers with two measuring tubes these are usually integrated into the process line via an inlet-side distributor element extending between the measuring tubes and an inlet-side connecting flange and via an outlet-side distributor element extending between the measuring tubes and an outlet-side connecting flange.
  • the latter In transducers with a single measuring tube, the latter usually communicates via an inlet side opening essentially straight connecting pipe segment and an outlet side opening substantially straight connecting pipe segment with the process line.
  • each of the transducers shown with a single measuring tube each comprising at least one one-piece or multi-part executed, for example, tube, box or plate, counter-oscillator, which is coupled to form a first coupling zone inlet side to the measuring tube and the outlet side to form a second coupling zone the measuring tube is coupled, and in operation essentially rests or opposite to the measuring tube, ie the same frequency and antiphase, oscillates.
  • the inner part of the transducer formed by means of measuring tube and counteroscillator is usually held solely by means of two connecting pipe pieces, via which the measuring tube in operation with the process line, held in a protective transducer housing, esp. In a vibration of the inner part relative to the measuring tube enabling manner.
  • the counteroscillator substantially tubular and formed as a substantially straight hollow cylinder, which is arranged in the transducer so that the measuring tube is at least partially encased by the counteroscillator.
  • materials for such counter-oscillators esp. Also when using titanium, tantalum or zirconium for the measuring tube, usually
  • the excitation arrangement of transducers of the type in question usually has at least one electrodynamic and / or differentially acting on the at least one measuring tube and the optionally present counteroscillator or possibly existing other measuring tube
  • Vibration generator while the sensor arrangement an inlet side, usually also electrodynamic, vibration sensor and at least one to substantially
  • identical outlet-side vibration sensor comprises.
  • Such electrodynamic and / or differential vibration exciter commercially available transducers of the vibration type are at least temporarily by a current - in transducers with a measuring tube and a counteroscillator coupled thereto mostly fixed to the latter - magnetic coil and interacting with the at least one magnetic coil, esp.
  • a current - in transducers with a measuring tube and a counteroscillator coupled thereto mostly fixed to the latter - magnetic coil and interacting with the at least one magnetic coil, esp.
  • an anchor rather elongated, esp. Rod-shaped, permanent magnet formed, which is fixed according to the measuring tube to be moved.
  • the permanent magnet and serving as excitation coil magnetic coil are usually aligned so that they are in the
  • the exciter assembly is usually designed and placed in the transducer that it acts substantially centrally on the at least one measuring tube.
  • Exciter arrangement as shown for example in the US-A 57 96 010, US-B 68 40 109, US-B 70 77 014 or US-B 70 17 424 proposed transducers, usually at least selectively along an imaginary central Peripheral line of the measuring tube fixed to the outside of this.
  • the vibration sensors of the sensor arrangement are usually each formed by means of a fixed to the measuring tube a magnetic permanent magnet armature and at least one cooperating with the armature, penetrated by the magnetic field and at least temporarily acted upon by an induced measuring voltage coil which, if present, usually on the counter-oscillator, otherwise fixed to one of the measuring tubes.
  • Each of the aforementioned coils is also connected by means of at least one pair of electrical leads with the aforementioned operating and evaluation of the in-line measuring device, which usually on the shortest possible paths from the coils on the
  • Counteroscillator are guided to the converter housing.
  • the meter electronics of commercially available in-line meters of the aforementioned type usually have a digital measured values in real time, for example, by means of a digital signal processor (DSP) formed microcomputer.
  • DSP digital signal processor
  • the meter electronics also usually has a conditioning of the measuring transducer supplied by the measuring signals for the microcomputer realizing input circuit, the formation of said measurement and evaluation of the meter electronics with the microcomputer accordingly is interconnected.
  • the microcomputer determines the desired primary measurements, such as an instantaneous mass flow rate of the medium flowing through the transducer and / or a total mass flow rate Corresponds to mass of the medium that has flowed through the transducer for a given period of time, and provides it in real time.
  • the required energy via 4-wire or by means of, for example, as 4-2OmA current loop with meter-side load modulation trained , 2-wire cable from
  • Vibration sensors relative to selected nodes of the vibration for the purpose of measuring the primary measured variable mass flow excited vibrations of the measuring tube or the measuring tubes attach a special importance.
  • EP-A 848 234 or WO-A 99/28708 also a low sensitivity to disturbances, about inform external vibrations, and insofar high measurement accuracy for measuring systems of the type in question would be achieved, for example, by the fact that the vibration sensors respectively as close as possible to nodes of the above-mentioned Nutzmodes be placed, whereby its share of the respectively detected by means of the sensor arrangement vibration and as far as possible at the respective primary signal is kept as low.
  • the vibration sensors of the sensor arrangement in order to achieve the highest possible
  • Mass flow rate at the same time the lowest possible sensitivity to any disturbances and sufficiently high signal-to-noise ratio of the primary signals in the range of the excited oscillation frequency typically placed in the transducer so that a length of a extending between the first vibration sensor and the second vibration sensor portion of the measuring tube corresponding Meßmother of the transducer is more than 65% of the vibration length.
  • the measuring length corresponds to an extended length of the tube between the two vibration sensors, essentially free-swinging pipe section of the respective measuring tube.
  • the in-line measuring device is supplied externally with electrical energy by means of a 4-2 oM current loop and also outputs the measured values by setting a proportional current strength of the current flowing in the current loop, the measuring system as a whole reverses the less electrical power and, to that extent, the less electrical exciter power available for the transducer, the more that would actually be needed for the desired high measurement accuracy.
  • the measuring system as a whole reverses the less electrical power and, to that extent, the less electrical exciter power available for the transducer, the more that would actually be needed for the desired high measurement accuracy.
  • there is a further disadvantage of high maximum vibration amplitudes in that it can increasingly provoke disturbing external vibrations and, as a result, the overall failure rate of the measuring system increases accordingly.
  • An object of the invention is therefore to improve the efficiency of transducers of the vibration type, with the current excitation in their respective exciter in operation fed electrical excitation power or excitation energy in primary signals are ultimately improved so that on the one hand, the primary signals, esp.
  • Their respective Coriolis mode Representing signal components, with the lowest possible maximum amplitude of the measuring tubes and thus with low electrical excitation power the highest possible signal to noise ratio and the highest possible signal-to-noise ratio and on the other hand, the sensor array and the extent of the transducer as a whole, a sufficiently high sensitivity to the having sensing primary measures, esp.
  • the invention consists in a transducer of the vibration type, which transducer
  • At least one first measuring tube for guiding flowing medium for example a gas and / or a liquid, which measuring tube is located between an inlet-side first
  • Meßrohrende and an outlet side second Meßrohrende extends with a swing length and in operation by an imaginary to the two Meßrohrenden imaginary connecting imaginary Connecting axis parallel or coincident vibration axis, for example, in a bending vibration mode, oscillates; such as
  • a sensor arrangement for detecting vibrations of the measuring tube with a measuring tube for example, on the inlet side, arranged, for example, electrodynamic, first vibration sensor, which provides a vibration of the measuring tube representing the first primary signal of the transducer, and a spaced from the first vibration sensor on the measuring tube, for example on the outlet side, arranged , for example electrodynamic, second
  • Vibration sensor which provides a vibration of the measuring tube representative second primary signal of the transducer, esp. Simultaneously to the first primary signal, comprising, wherein a length of a extending between the first vibration sensor and the second vibration sensor portion of the first measuring tube defines a measuring length of the transducer.
  • the first vibration sensor of the sensor arrangement and the second vibration sensor of the sensor arrangement are also placed in the transducer that a sensitivity S IST of the transducer, with a measured variable to be detected, esp.
  • the invention consists in a, for example, as a compact meter and / or a Coriolis mass flow meter trained, measuring device for flowable, esp. Fluid, media, such a transducer and a device electrically coupled with namely measuring instrument electronics for processing of primary signals supplied by the transducer and for generating measured values.
  • the at least one measuring tube is partially, esp. Within the itself between the first vibration sensor and the second
  • Vibration sensor extending area, arcuate, esp. Circular arc, formed.
  • Measuring tube is at least formed within the extending between the first vibration sensor and the second vibration sensor area substantially V-shaped.
  • the measuring tube has a caliber which is more than 1 mm, in particular more than 5 mm. Further developing this embodiment of the invention is further provided that the caliber of the measuring tube is more than 50 mm, for example, more than 60 mm, and that the measuring length of the transducer less than 65% of the vibration length, for example, more than 40% of the vibration length , corresponds.
  • the caliber of the measuring tube more than 15 mm, for example, more than 20 mm, and / or less than 50 mm, for example, less than 40 mm, amount, and the measuring length of the transducer thereby also less than 55% of the vibration length
  • the first measuring tube advantageously further dimensioned and the vibration sensors be placed so that a Meßin to caliber ratio of the transducer, defined by a ratio of the measuring length of the transducer to the caliber of the measuring tube, less than 10, esp. Smaller than 5, is.
  • the first vibration sensor of the sensor arrangement and the second vibration sensor of the sensor arrangement are placed in the transducer such that a measuring length-to-oscillation length ratio is defined by a ratio of the measuring length to
  • the fourth embodiment of the invention is further provided that the two straight pipe segments by means of an arcuate, for example circular arc,
  • Pipe segments are interconnected, esp. Such that the arcuate pipe segment measured from the center line of average pipe bend radius R, which is less than 500 mm, for example, less than 300 mm, and that the measuring tube, but at least the arcuate tubular segment, a Pipe wall thickness less than 7 mm, for example, less than 3 mm.
  • the first measuring tube is further dimensioned so that the area moment of inertia of a cross section of the measuring tube is at least 40mm 4 , for example, more than 150mm 4 , esp. Such that a
  • Area of inertia to Meßpen ratio ho / L 5 o of the transducer defined by a ratio of namely area moment of inertia to the measuring length of the transducer, more than 40mm 3 , for example, more than 100mm 3 , is.
  • the arcuate tube segment can also be designed such that a tube bend radius-to-tube outer radius ratio, defined by a ratio of the tube bend radius through a tube outer radius of the arcuate tube segment, less than 60, for example, less than 50, and / or more than 3, for example, more than 4, is;
  • a tube bend radius-to-tube outer radius ratio defined by a ratio of the tube bend radius through a tube outer radius of the arcuate tube segment, less than 60, for example, less than 50, and / or more than 3, for example, more than 4, is;
  • the first vibration sensor and the second vibration sensor are identical to one another.
  • this further comprises an inlet side on the measuring tube to form a first coupling zone and on the measuring tube to form a second coupling zone, esp. Oscillating in operation substantially opposite phase to the measuring tube and / or parallel thereto, counteroscillator, wherein the first coupling zone defines an inlet-side first end of the measuring tube and the second coupling zone defines an outlet-side second end of the measuring tube.
  • This embodiment of the invention further forming is further provided in particular that both the first vibration sensor and the second vibration sensor are placed in the transducer so that each of the
  • Vibration sensors for example, predominantly or exclusively, vibrations of the measuring tube relative to the counteroscillator, for example, differentially detect; and / or that measuring tube and counteroscillator oscillate in phase opposition to each other during operation at least on a common oscillation frequency; and / or that both the first primary signal and the second
  • Primary signal for example, the same, represent oscillatory movements of the at least one measuring tube relative to the counteroscillator; and / or that the, and / or identical, vibration sensors vibration of at least one, and / or U- or V-shaped, measuring tube and, and / or U-shaped or V-shaped counter-oscillator, for example, simultaneously and / or differentially, to capture.
  • the first vibration sensor equidistant from a center of the measuring tube is placed in the transducer, as the second vibration sensor.
  • this further comprises two to form a first coupling zone inlet side by means of a, for example plate-shaped, first coupler element and forming a second coupling zone on the outlet side by means of a, for example plate-shaped, second coupler element mechanically interconnected, for example during operation substantially in opposite phase to each other oscillating and / or mutually parallel and / or identical in terms of shape and material, measuring tubes, wherein the first coupling zone in each case an inlet-side first end of each of the measuring tube and the second
  • Coupling zone each define an outlet side second end of each of the measuring tubes. Further developing this embodiment of the invention is further provided that each of the two measuring tubes in each case communicates with a first distributor element of the measuring transducer on the inlet side and with a second distributor element of the measuring transducer on the outlet side. Alternatively or in addition to this embodiment of the invention is further provided that the two measuring tubes oscillate in phase opposition to each other at least at a common oscillation frequency, and / or that both supplied by the first vibration sensor first primary signal of the transducer and that supplied by the second vibration sensor second primary signal of the transducer oscillations of the measuring tubes relative to each other, for example, to each other in opposite phase oscillations of the measuring tubes represent.
  • this further comprises at least one, especially one, in operation, for example, in an area of half the oscillation length, acting on the measuring tube, for example electrodynamic,
  • Vibration generator having exciter arrangement for vibrating the at least one measuring tube, for example in a bending mode in which it is at least partially
  • the at least one measuring tube is excited at least temporarily in a Nutzmode by means of the excitation device, in which it, for example, predominantly or exclusively, bending vibrations about the imaginary axis of vibration, for example with a single and / or with a lowest
  • Resonant frequency of the measuring tube performs, esp. Such that each of the primary signals of the
  • Transducer each one, for example, dominant and / or with the Nutzmode
  • Embodiment of the invention further provided that the first vibration sensor equidistant from the at least one vibration exciter spaced in the transducer is placed as the second vibration sensor.
  • the measuring tube made of metal, esp. At least partially made of stainless steel, titanium, tantalum, or zirconium, is produced.
  • Sensor arrangement otherwise has no additional vibration sensors in addition to the first and second vibration sensor.
  • the measuring length of the measuring transducer corresponding to the length of the region of the measuring tube extending between the first vibration sensor and the second vibration sensor is less than 65%, in particular less than 55%, the vibration length and more than 25%, in particular more than 30%, of
  • Oscillation length corresponds.
  • the Meß réelle- electronics at least temporarily, both by means of the first primary signal and by means of the second primary signal, esp. Based on existing between the first primary signal and the second primary signal phase difference, a, esp. digital, mass flow rate measurement that currently represents a mass flow rate, m, of fluid flowing through the transducer.
  • the measuring device electronics in operation repeatedly generates a phase difference value which currently represents the phase difference existing between the first primary signal and the second primary signal.
  • this further comprises a, in particular in operation with the evaluation circuit communicating, with the transducer electrically coupled, at least one of whose exciter device controlling exciter signal supplying driver circuit.
  • the measuring device electronics can be electrically connected to an external electronic data processing system by means of a two-wire connection, in particular as a 4-20 mA current loop.
  • the evaluation circuit at least temporarily generated by means of at least one of the primary signals, a digital, density measured value, which currently represents a density, p, of medium flowing through the transducer.
  • the evaluation circuit generates, at least temporarily, by means of at least one of the primary signals, a digital, viscosity measured value which represents a viscosity, ⁇ , of medium flowing through the measuring transducer.
  • a basic idea of the invention is that of the selective detection of the
  • Coriolis mode serving vibration sensors in comparison to conventional transducers of the vibration type closer to the location of maximum vibration amplitude of the vibrations of the vibration
  • the invention is based on the surprising finding that not only a high sensitivity - achievable by a high gauge length - decisive for the
  • Measuring accuracy of measuring systems of the type in question is, but in particular, the highest possible signal amplitude of the primary signals - achieved by the smallest possible Meßsay.
  • An advantage of the invention is, inter alia, that even while maintaining established circuit architectures and technologies for Meßsignalaufpung and evaluation highly accurate measurement of the mass flow rate or the mass flow rate is also possible with very low excitation power and / or at very low mass flow rates. in the As a result, the measuring range of measuring systems of the type in question can be expanded as a whole.
  • Another advantage of the transducer according to the invention is also to be seen in that are particularly suitable for use in small-power of less than 1W and / or by means of 4-20mA current loop operated measuring systems.
  • Fig. 1a, b shows a variant of a trained as a compact meter measuring system for in
  • FIG. 2a, b another variant of a compact measuring device designed as measuring system for in
  • FIG. 3 schematically in the manner of a block diagram a, esp. Also for a measuring system according to Figures 1a, 1 b, 2 a, 2 b, suitable, meter electronics connected thereto transducer of the vibration type;
  • FIG. 4, 5 in, partially in section and in perspective views, a variant of a, esp.
  • transducer of the vibration type for a measuring system according to Figures 1a, 1 b suitable, transducer of the vibration type;
  • Fig. 6, 7 in, partially cut or perspective views, a further variant of, esp.
  • transducer of the vibration type for a measuring system according to Figures 2a, 1 b suitable, transducer of the vibration type;
  • Fig. 8 is a schematic side view, esp. For use in one
  • Measuring transducer according to Figures 4 and 5 or 6 and 7 suitable, measuring tube.
  • 1a, 1b or 2a, 2b respectively show a variant of a process line, not shown here, such as a pipeline of an industrial plant, insertable measuring system designed, for example, as a Coriolis mass flowmeter, density measuring device, viscosity measuring device or the like for flowable, in particular fluid, media, in particular the measuring and / or monitoring of at least one physical quantity, such as a
  • Mass flow a density, a viscosity, a pressure, etc., used by a medium flowing in the process line.
  • the - realized here as an in-line measuring device in compact design - measuring system includes for this purpose a connected via an inlet end and an outlet end to the process line transducer of the vibration type, which transducer during operation
  • meter electronics ME of the measuring system is connected.
  • evaluation circuit ⁇ C of the measuring system electrically
  • the driver circuit Exe and the evaluation circuit ⁇ C and other, the operation of the measuring system serving electronic components of the meter electronics, such as internal power supply circuits NRG for providing internal supply voltages U N and / or the connection to a higher Meßstein für für für für für für für für für für für für für für für für für für für aspirin, and / or a communication bus COM serving a field bus, are also housed in a corresponding electronics housing 200, in particular impact-resistant and / or explosion-proof and / or hermetically sealed.
  • the measuring system further comprise at least temporarily communicating with the meter electronics display and control HMI, such as a in Electronics housing behind a window provided therein correspondingly placed LCD or TFT display and a corresponding input keyboard and / or a touch screen.
  • the meter electronics ME especially programmable and / or remotely programmable, can also be designed such that, during operation of the in-line meter, it is connected to a superordinate electronic data processing system, for example a programmable logic controller (PLC), a personal computer and / or. or a workstation, via data transmission system, such as a fieldbus system and / or wirelessly by radio, measuring and / or other operating data can exchange, such as current measurements or the control of the inline measuring device serving adjustment and / or
  • PLC programmable logic controller
  • the meter electronics ME for example, such an internal Have power supply circuit NRG, which in operation of a in the
  • the meter electronics are further configured to be electrically connectable to the external electronic data processing system by means of a two-wire connection 2L configured, for example, as a 4-20 mA current loop, and supplied with electrical power thereto, and measurements can transmit to the data processing system.
  • the meter electronics ME may have a corresponding communication interface COM for a
  • the electrical connection of the transducer to the mentioned meter electronics can be done by means of corresponding leads, which led out of the electronics housing 200, for example via cable bushing, and at least partially within the
  • the leads may be at least partially as electrical, at least partially formed in wrapped by an electrical insulation wires, e.g. inform of "twisted pair" cables, ribbon cables and / or
  • Coaxial cables Alternatively or in addition to the connecting lines can at least in sections, by means of traces of a, especially flexible, optionally painted
  • Printed circuit board be formed, see. this also the aforementioned US-B 67 11 958 or US-A 53 49 872.
  • transducer MW is generally used in a flowing medium, such as a gas and / or a liquid, mechanical
  • Reaction forces e.g. Mass flow-dependent Coriolis forces, density-dependent inertial forces and / or viscosity-dependent frictional forces to produce, the measurable, esp. Sensory detectable, act back on the transducer. Derived from these reaction forces, e.g. a mass flow m, a density p and / or a viscosity ⁇ of the medium are measured.
  • Each of the transducers comprises for this purpose in each case one arranged in a converter housing 100, the physical-electrical conversion of the at least one parameter to be measured actually acting inner part.
  • the transducer housing 100 may also serve to secure the electronics housing 200 of the in-line meter therein
  • the inner part of the transducer generally comprises at least a first - in the embodiment shown in FIGS. 4 and 5 - at least
  • Meßrohrende 11 # and an outlet side second Meßrohrende 12 # with a swing length L 10th extends and vibrate to generate the aforementioned reaction forces during operation at least over its oscillation length L 10 and thereby, oscillating about a static rest position, repeatedly elastically deformed.
  • the oscillation length L 10 corresponds, as shown schematically again in FIG. 8, in this case to a length of an imaginary center line or also gravity line (imaginary connecting line through the center of gravity of all cross-sectional areas of the measuring tube), ie in the case of a curved measuring tube that is an elongate line Length of the measuring tube 10.
  • the transducer in the embodiment shown in FIGS. 4 and 5 has only a single measuring tube and at least insofar in its mechanical structure as well as its operating principle in the US-B 73 60 451 or the US-B 66 66 098 proposed or even on the part of the applicant under the type designation "PROMASS H", "PROMASS P" or "PROMASS S” commercially available transducers similar - serve to implement the invention, of course, with more than one measuring tube can be similar to that shown in the aforementioned US-A 57 96 011, US-A 57 31 527, or US-B 69 20 798 or, for example, the part of the Applicant under the type designation "PROMASS E” or "PROMASS F” Commercially available transducers each with two parallel measuring tubes.
  • the transducer can also at least two, for example by means of an inlet-side distributor element and an outlet-side distributor element, optionally additionally by means of at least one inlet-side coupling element and at least one outlet-side coupling element, mechanically coupled to each other and / or identical and / or curved and / or each other
  • the transducer in addition to the first measuring tube 10, a second measuring tube 10 'that on the inlet side by forming a first coupling zone by means of a, for example plate-shaped, first coupler element and under education a second coupling zone on the outlet side by means of a, for example plate-shaped and / or identical to the first coupler element, second coupler element with the first measuring tube 10 is mechanically connected.
  • the first coupling zone each define an inlet-side first Meßrohrende 11 #, 1 1 '# each of the two measuring tubes 10, 10' and the second coupling zone each have an outlet-side second Meßrohrende 12 #, 12 '# # of the two measuring tubes 10, 10 '. Since, in the event that the inner part is formed by means of two measuring tubes, each of the two, in particular. In operation substantially opposite phase to each other oscillating and / or parallel and / or identical in terms of shape and material, measuring tubes serves to guide medium to be measured, communicates each of the two measuring tubes for another
  • Embodiment of this second variant of the transducer according to the invention in each case on the inlet side with an inflowing medium in two partial flows dividing common first distributor element 15 of the transducer and each outlet side with a the partial flows again merging common second distribution element 16 of the transducer, so that so both measuring tubes are flowed through during operation of the measuring system simultaneously and in parallel by medium.
  • the at least one measuring tube 10 is in each case shaped so that the aforementioned center line, as quite normal in transducers of the type in question, is located in an imaginary tube plane of the transducer. According to one embodiment of the invention, the at least one measuring tube 10 is thereby vibrated during operation so that it is a vibration axis, esp. In a
  • the at least one measuring tube 10 is further shaped and arranged in the transducer that the aforementioned
  • the at least one measuring tube has a tube inner diameter corresponding caliber D 10 , the more than 1 mm, especially than 5 mm.
  • the at least one measuring tube according to one embodiment of the invention also has a
  • Pipe wall thickness s which is less than 7 mm, esp. Less than 3 mm, esp.
  • I 10
  • the at least one measuring tube 10 of the transducer made, for example, from stainless steel, titanium, tantalum or zirconium or an alloy thereof, and to that extent also an imaginary center line of the measuring tube 10 running within lumens, may e.g. essentially U-shaped or, as also shown in FIGS. 4 and 5 or 6 and 7, be substantially V-shaped.
  • the at least one measuring tube according to a further embodiment of the invention, an inlet side first straight tube segment having an imaginary longitudinal axis having a pointing in the direction of the first coupling zone directional vector a1, and an outlet side second straight tube segment with an imaginary longitudinal axis, one in the direction of second
  • Coupling zone pointing direction vector a2 Coupling zone pointing direction vector a2, on.
  • Meßrohrgeometrien quite common, connected by means of an arcuate - here a substantially circular arc-shaped - pipe segment.
  • the arcuate Tube segment for the purpose of forming a compact transducer as possible of the shortest overall installation length is the arcuate Tube segment according to a further embodiment of the invention in this case also designed so that, measured from the center line, it has a mean pipe bend radius R, which is less than 500 mm, esp. Less than 300 mm.
  • the two straight tube segments of the at least one measuring tube 10 are further aligned with each other so that, as also shown schematically in Fig. 8, the directional vector aj_ the imaginary longitudinal axis of the first straight tube segment and the direction vector a £ the imaginary longitudinal axis of the second straight tube segment an angle ⁇ include.
  • the amount of the angle ⁇ is in the event that the two straight pipe segments are connected to each other via a circular arc-shaped pipe segment, by pipe bend radius R and the corresponding arc length B of the arcuate
  • the at least one measuring tube thereby aligned with each other so that the angle ⁇ is less than 170 ° and more than 10 °.
  • the measuring tube is further formed so that the angle ⁇ is less than 160 ° and / or more than 20 °.
  • Pipe segment less than 60, esp. Less than 50, and / or more than 3, esp. More than 4, is.
  • the inner part of the transducer according to the embodiment shown in FIGS. 4 and 5 further comprises a mechanically with the - Here only - measuring tube 10 coupled, for example, similar to the measuring tube U- or V-shaped, counter-oscillator 20. This is, as shown in Fig.
  • the - in this case substantially parallel to the measuring tube 10 extending, possibly also arranged coaxially to this - counteroscillator 20 is made of a tube with respect to the thermal expansion behavior compatible metal, such as steel, titanium or zirconium, and can be, for example, tubular or in be essential box-shaped also executed. As shown in Fig.
  • the counteroscillator 20 may be formed for example by means of left and right sides of the measuring tube 10 arranged plates or also left and right side of the measuring tube 10 arranged dummy tubes.
  • the counter-oscillator 20 - like as proposed in US-B 66 66 098 - also be formed by means of a single side of the measuring tube and extending parallel thereto dummy tube.
  • the counteroscillator 20 is supported in the embodiment shown here by means of at least one inlet-side first coupler 31 at the first Meßrohrende 11 # and at least one outlet side, in particular to the coupler 31 substantially identical, the second coupler 32 at the second Meßrohrende 12 #.
  • a coupler 31, 32 for example, simple node plates can be used here, the respective inlet side and outlet side respectively to measuring tube 10 and
  • Counteroscillator 20 are attached. Furthermore, as proposed in the embodiment shown in FIGS. 2 and 3, a nodal plate spaced apart from one another in the direction of the imaginary longitudinal axis L of the transducer together with protruding ends of the counteroscillator 20, respectively formed on the inlet side and outlet side, completely closed box or possibly partially open frame as a coupler 31 and serve as a coupler 32. As schematically illustrated in FIGS. 2 and 3, the measuring tube 10 is further connected via a straight first connecting tube section 11 which opens into the region of the first coupling zone on the inlet side and escpecially via an outlet side in the region of the second coupling zone
  • the measuring tube 10 and together with the two connecting pipe pieces 11, 12 may be made in one piece, so that for their manufacture, for. a single tubular semi-finished product of a conventional material for such transducers, such as e.g. Stainless steel, titanium, zirconium, tantalum or corresponding alloys thereof.
  • inlet tube piece 1 1 and outlet tube 12 are each formed by segments of a single, one-piece tube, these, if necessary, but also by means of individual, subsequently assembled, e.g.
  • Embodiment is further provided that the two connecting pipe pieces 11, 12, so aligned with each other and to one of the two coupling zones 11 #, 12 # imaginary connecting imaginary longitudinal axis L of the transducer, that here formed by counter-oscillator and measuring tube inner part, along with twists of two connecting pipe pieces 11, 12, can oscillate about the longitudinal axis L.
  • the two connecting pipe pieces 11, 12 are aligned with each other so that the substantially straight pipe segments are substantially parallel to the imaginary longitudinal axis L or to the imaginary axis of vibration of the measuring tube that the pipe segments are aligned both to the longitudinal axis L and each other substantially. Since the two connecting pipe pieces 11, 12 shown in here
  • Embodiment practically over its entire length away are carried out substantially straight, they are accordingly aligned overall relative to one another and to the imaginary longitudinal axis L substantially aligned.
  • this is, especially in the In comparison with the measuring tube 10, the bending and torsion-resistant transducer housing 100, in particular rigidly, is fixed to an inlet end of the inlet-side connecting tube 11 which is distal to the first coupling zone and to an outlet end of the outlet-side connecting tube 12 which is distal to the first coupling zone.
  • the whole - here by means of measuring tube 10 and counteroscillator 20 formed - inner part not only completely enveloped by the converter housing 100, but also supported vibrationally due to its own mass and the spring action of both connecting pipe pieces 11, 12 in the converter housing 100.
  • the transducer MW is releasably mounted with, for example, formed as a metallic pipe, process line, inlet side of the transducer of a first flange 13 and the outlet side, a second flange 14 are provided.
  • Connecting flanges 13, 14 can, as is customary in the case of measuring transducers of the type described, also be integrated into the converter housing 100 at least partially at the end. If necessary, the connecting pipe pieces 11, 12 but also directly with the rest
  • each of the measuring transducers shown in FIGS. 4 to 7 further comprises a, esp.
  • Electrodynamic excitation arrangement 40 This serves - driven by a supplied by the driver circuit of the meter electronics and, optionally in conjunction with the evaluation circuit, suitably conditioned excitation signal, eg with a regulated current and / or a regulated voltage -jeweils , Excited by the driver circuit electrical excitation energy E exc in a on the at least one measuring tube 10, for example, pulse-shaped or harmonic, acting and this in the manner described above deflecting excitation force F exc convert.
  • the excitation force F exc may, as is usual with such transducers, be bidirectional or unidirectional and in the manner known in the art, for example by means of a current and / or voltage control circuit, in terms of their amplitude and, for example by means of a phase-locked loop, with regard to their Frequency are set.
  • an exciter assembly 40 may, for example, in a conventional manner by means of - for example, single, ie in the region of half an oscillating length L 10 , on the respective measuring tube attacking, electrodynamic
  • Vibration generator 41 formed exciter assembly 40 serve.
  • the vibration exciter 41 may, in the case of an inner part formed by counteroscillator and measuring tube, as indicated in FIG. 4, for example, by means of a cylindrical attached to the counter-oscillator 20
  • Excitation coil which flowed during operation of a corresponding excitation current and thus is also flooded by a corresponding magnetic field, and a at least partially immersed in the exciter coil permanent magnet armature, which is fixed from the outside, esp. Centrally, on the measuring tube 10, be formed.
  • Further excitation arrangements for oscillations of the at least one measuring tube which are also suitable for the measuring system according to the invention are described, for example, in the aforementioned US-A 57 05 754, US-A 55 31 126, US-B 62 23 605, US-B 66 66 098 or US-B 73 60 451.
  • the at least one measuring tube 10 is actively excited in operation by means of the excitation arrangement at least temporarily in a Nutzmode in which it, esp. Predominantly or exclusively, bending vibrations to the mentioned imaginary
  • the bending oscillations of the measuring tube have an inlet-side node in the region of the inlet side end of the measuring tube 11 # defining the inlet-side coupling zone and an outlet-side node in the region of the outlet-side coupling tube 12 # defining outlet-side coupling zone, so that the measuring tube with its oscillating length L 10 between them both oscillation node extends substantially free swinging.
  • the vibrating measuring tube but also, as proposed in US-B 70 77 014 or JP-A 9-015015, by means of correspondingly in the range of the vibration length on the measuring tube additionally attacking resilient and / or electromotive coupling elements in its oscillatory movements be specifically influenced.
  • the driver circuit may be formed, for example, as a phase-locked loop (PLL), which is used in the manner known to the expert to an excitation frequency, f exc of the
  • phase-locked loops for actively exciting measuring tubes to oscillations on a mechanical natural frequency is described in detail, for example, in US Pat. No. 4,801,897.
  • other suitable for setting the excitation energy E exc suitable, known to those skilled and driver circuits, for example, according to the above-mentioned prior art, such as the aforementioned US-A 47 77 833, US-A 48 01 897, US-A 48 79 91 1, US-A 50 09 109, US-A 50 24 104, US-A 50 50 439, US-A 58 04 741, US-A 58 69 770, US-A 6073495 or US-A 63 11 1 36.
  • PROMASS P or "PROMASS S” are offered.
  • the driver circuit is, for example, in each case designed such that the lateral bending oscillations in the payload mode are regulated to a constant, thus also independent of the density, p, substantially independent amplitude.
  • the exciter assembly 40 To vibrate the least one measuring tube 10, the exciter assembly 40, as already mentioned, by means of an equally oscillating excitation signal of adjustable excitation frequency, f exc fed, so that the excitation coil of - here only on the measuring tube 10 attacking
  • the driver or exciter signal or its excitation current i exc may be harmonic, multi-frequency or even rectangular, for example.
  • the excitation frequency, f e ⁇ C required for maintaining the bending vibrations of the at least one measuring tube 10
  • Excitation current i exc can be selected and adjusted in an advantageous manner in the embodiment shown in the embodiment, that the laterally oscillating measuring tube 10 oscillates at least predominantly in a bending vibration fundamental mode with a single antinode. Accordingly, according to a further embodiment of the invention, the excitation or Nutzmodefrequenz, f exc , adjusted so that it corresponds as closely as possible to a natural frequency of bending vibrations of the measuring tube 10, esp. Of the Bieschwwingungsgroundmodes. When using an off
  • Stainless steel esp. Hastelloy made measuring tube with a caliber D 10 of 29 mm, a wall thickness s of about 1, 5 mm, a swing length of about 420 mm and a stretched length, measured between the two Meßrohrenden, of 305 mm, the The resonance frequency thereof corresponding to the bending vibration fundamental mode may be approximately 490 Hz, for example, at a density of practically zero, for example in the case of a measuring tube filled only with air.
  • the measuring tube 10 carries out the bending oscillations actively excited by the excitation arrangement predominantly relative to the counteroscillator 20, in particular in opposite phase to one another at a common oscillation frequency.
  • the measuring tube 10 carries out the bending oscillations actively excited by the excitation arrangement predominantly relative to the counteroscillator 20, in particular in opposite phase to one another at a common oscillation frequency.
  • the counteroscillator 20 is excited to simultaneous cantilever oscillations, in such a way that it oscillates at the same frequency, but at least partially out of phase, esp. Essentially opposite phase, oscillating in the Nutzmode measuring tube 10.
  • measuring tube 10 and counteroscillator 20 are further coordinated or excited so that they perform at least temporarily and at least partially counterparts, ie equal frequency, but substantially out of phase, bending vibrations about the longitudinal axis L during operation.
  • Bending vibrations can be designed so that they are of the same modal order and thus at least at rest fluid substantially uniform; in the other case the Using two measuring tubes, these, as usual with transducers of the type in question, by means of the, esp. Differentially between the two measuring tubes 10, 10 'acting energizer arrangement actively excited so that they run during operation at least temporarily gegentechnische bending vibrations about the longitudinal axis L. In other words, the two measuring tubes 10, 10 'or measuring tube 10 and counter-oscillator 20 then each move in the manner of mutually oscillating tuning fork tines.
  • Coriolis is in this case, especially in terms of their amplitudes, depending on the instantaneous mass flow m.
  • Coriolis mode as is common with such curved tube transducers, e.g. serve the natural mode of the anti-symmetric twist mode, ie those in which the measuring tube 10, as already mentioned, and torsional vibrations about a perpendicular to the
  • Bending vibration axis aligned imaginary torsional vibration axis that intersects the center line of the measuring tube 10 in the region of half the oscillation length L 10 imaginary.
  • the measuring transducer For detecting oscillations, in particular bending oscillations, of the at least one measuring tube 10, in particular also those in Coriolis mode, the measuring transducer furthermore has a corresponding sensor arrangement 50 in each case.
  • Vibrations of the measuring tube 10 representing the first primary signal Si of the transducer provides, for example, a voltage corresponding to the vibrations or corresponding to the vibrations current, and a spaced from the first vibration sensor 52 at least one measuring tube 10 arranged, esp. Electrodynamic, second vibration sensor 52, the a second vibration representative of the measuring tube 10
  • Primary signal S 2 of the transducer provides.
  • a length of between the two, for example identical, vibration sensors extending, esp. Essentially free-vibrating, the corresponding at least one measuring tube corresponds, as shown schematically in Fig. 8, in this case a measuring length L 50 of the respective transducer.
  • Each of the - typically broadband - primary signals si, S 2 of the transducer MW in this case has in each case one corresponding to the Nutzmode signal component with one of the current
  • Oscillation frequency, f e ⁇ C of the oscillating in active excited Nutzmode at least one measuring tube 10 corresponding signal frequency and one of the current mass flow of the im at least one measuring tube 10 flowing medium dependent phase shift relative to, for example by means of PLL depending on a between at least one of
  • i exc phase difference generated excitation signal
  • the corresponding with the Nutzmode signal component of each of the primary signals other, esp. With any external interference corresponding and / or classify as noise due to the usually very high vibration quality of the transducer , Signal components predominates and so far also at least within one of a bandwidth of the Nutzmodes corresponding
  • the first vibration sensor 51 on the inlet side and the second vibration sensor 52 are arranged on the outlet side at least one measuring tube 10, esp. From at least one vibration exciter or equidistant from the center of the measuring tube 10 as the first vibration sensor.
  • transducers from a designed as a Coriolis mass flow meter measuring system, transducers from
  • the vibration sensor 52 is further arranged in each case on a side of the measuring tube occupied by the vibration exciter 41 in the measuring transducer.
  • the second vibration sensor 52 can also be arranged on the side of the measuring tube occupied by the first vibration sensor 51 in the transducer.
  • vibration sensors of the sensor arrangement can advantageously also be designed so that they provide primary signals of the same type, for example, in each case a signal voltage or a signal current.
  • both the first vibration sensor and the second vibration sensor are further each placed in the transducer MW, that each of the vibration sensors at least predominantly detects vibrations of at least one measuring tube 10.
  • the inner part is formed by means of a measuring tube and a counter-oscillator coupled thereto, according to a further embodiment of the invention, both the first vibration sensor and the second
  • Vibration sensor designed and placed in the transducer so that each of the
  • Vibration sensors predominantly oscillations of the measuring tube relative to the counteroscillator, for example, differentially detect, so that both the first primary signal Si and the second primary signal S 2 , esp. Counterparts, represent oscillatory movements of at least one measuring tube 10 relative to the counteroscillator 20.
  • the inner part is formed by means of two, esp.
  • gegen Eisen swinging, measuring tubes according to another embodiment of the invention, both the first vibration sensor and the second vibration sensor is formed and placed in the transducer so that each of the
  • Vibration sensors predominantly oscillations of the first measuring tube 10 relative to the second measuring tube 10 ', for example, differentially detect, so that both the first primary signal Si as Also, the second primary signal S 2 , esp. Opposite, represent oscillatory movements of the two measuring tubes relative to each other.
  • the sensor arrangement has exactly two vibration sensors, that is to say in addition to the first and second vibration sensors no further vibration sensors, and insofar corresponds to a conventional sensor arrangement with regard to the components used.
  • Signal component with a current oscillation frequency, f e ⁇ C , of the active excited in Nutzmode oscillating at least one measuring tube 10 corresponding signal frequency are, as shown in Fig. 3, that of the meter electronics ME and there then the measuring and Evaluating circuit ⁇ C supplied where they are first preprocessed by means of a corresponding input circuit FE, esp. Pre-amplified, filtered and digitized, to then be able to be suitably evaluated.
  • a corresponding input circuit FE esp. Pre-amplified, filtered and digitized
  • the measuring and evaluating circuit ⁇ C is accordingly also realized by means of a measuring device electronics ME provided, for example by means of a digital signal processor (DSP),
  • DSP digital signal processor
  • the program codes can be persistently stored, for example, in a non-volatile memory EEPROM of the microcomputer and, when it is started, loaded into a volatile memory RAM integrated, for example, in the microcomputer.
  • Processors suitable for such applications are, for example, those of the TMS320VC33 type marketed by Texas Instruments Inc. It goes without saying that the primary signals si, S 2 as already indicated, for processing in the microcomputer by means of corresponding analog-to-digital converter A / D of the meter electronics ME in
  • the measuring and evaluating circuit ⁇ C is used according to an embodiment of the invention in particular, by means of the primary signals si, S 2 supplied by the sensor arrangement 50, for example by means of a primary signals si, S 2 generated between the measuring tubes 10 which oscillate proportionally in useful and Coriolis mode of the first and second vibration sensors 51, 52 detected phase difference, recurring a mass flow measurement value X m to determine the mass flow rate to be measured, m, of the medium guided by the transducer as possible exactly represented.
  • the evaluation circuit for example, derived from a current mass flow value X m and / or a plurality of pre-sequentially generated and / or mass flow measurements, to determine a mass measured value X M , which is a totalized Mass flow, M, currently represented.
  • the evaluation circuit in operation repeatedly generates a phase difference value X ⁇ which currently represents the phase difference ⁇ i existing between the first primary signal Si and the second primary signal S 2 .
  • the evaluation circuit of the measuring system according to the invention can also be used, derived from one, for example on the basis of at least one of the primary signals supplied by the sensor arrangement measured vibration frequency of lateral bending vibrations of the at least one measuring tube 10, for example, those in Nutzmode, in the person skilled in and for In a known manner additionally generate a, for example digital, density measurement value X p , which currently represents a density to be measured, p, of the medium.
  • the evaluation circuit as is customary for in-line measuring devices of the type in question, may also be used, derived from the drive signal i eXc , which is also known as a measure of an apparent viscosity or a viscosity index.
  • Density product of the medium guided in the measuring tube can serve to determine a, for example digital, viscosity measured value X ⁇ , which currently represents a viscosity of the medium, cf. this also the US-B 70 17 424, US-B 68 40 109 or US-B 66 51 513.
  • a digital, viscosity measured value X ⁇ which currently represents a viscosity of the medium, cf. this also the US-B 70 17 424, US-B 68 40 109 or US-B 66 51 513.
  • any provisional, Measured values in the measuring device electronics ME are buffered at least temporarily, for example in the mentioned EEPROM memory and / or RAM memory, and can thus be kept sufficiently long for subsequent uses.
  • the abovementioned, in particular also the arithmetic functions respectively serving the generation of the mass flow measurement value X m or other of the aforementioned measured values, can be realized very simply, for example by means of the abovementioned microcomputer of the evaluation circuit ⁇ C or, for example, also a digital signal processor DSP provided therein be.
  • the creation and implementation of corresponding algorithms which correspond to the above-described formulas or, for example, also reproduce the mode of operation of the mentioned amplitude or frequency control circuit for the excitation arrangement, as well as their translation in the meter electronics according to executable program codes is the person skilled in and for is familiar and therefore requires - at least in knowledge of the present invention - no more detailed explanation.
  • each measured variable such as the mass flow rate and / or density, corresponding signal size, such as a
  • Vibration sensor of the sensor assembly placed in the transducer so that the measuring length L 50 of the transducer less than 65%, esp. Less than 55%, the oscillation length L 10 and more than 25%, esp. More than 30%, the oscillation length L 10 , see. 9, in particular also in conjunction with FIG. 8.
  • the two vibration sensors are optimally placed in the transducer when the actual sensitivity SIST achieved by the sensor
  • R R ' satisfied; the latter in particular for the above-mentioned case that the arcuate pipe segment is formed so that its pipe bend radius to pipe outer radius ratio R 'is less than 60 and / or more than 3.
  • the at least one measuring tube are dimensioned according to a further embodiment of the invention and the vibration sensors placed in the transducer so that a Meßmother to caliber ratio L 50 / D 10 of the transducer, defined by a ratio of the measuring length L 50 of the transducer to the caliber D 10 of the measuring tube, less than 10, esp. Less than 5, is; esp.
  • a Meßmother to caliber ratio L 50 / D 10 of the transducer defined by a ratio of the measuring length L 50 of the transducer to the caliber D 10 of the measuring tube, less than 10, esp. Less than 5, is; esp.
  • the caliber D 10 of the at least one measuring tube is more than 15 mm, esp.
  • the measuring length L 50 of the transducer less than 55% of Oscillation length L 10 corresponds, or that in the event that the caliber D 10 of the measuring tube is more than 50 mm, esp. More than 60 mm, the measuring length L 50 of the transducer less than 65% of the oscillating length L 10 , esp. But more than 40% of the vibration length L 10 , corresponds; this in particular also for the above-mentioned case, that the same moment of inertia I 10 of the measuring tube is 40 mm 4 or more or the measuring tube also shaped and dimensioned and the vibration sensors are placed so that, as shown in FIG.
  • a Area of inertia to Meß treat ratio I 10 / L 50 of the transducer defined by a ratio of an area moment of inertia I 10 of a cross section of the measuring tube to the measuring length L 50 of the transducer, more than 40 mm 3 , esp. More than 100 mm 3 , is ,

Abstract

Le convertisseur de mesure, qui est, en particulier également conçu pour être utilisé dans un appareil de mesure de débit massique à effet Coriolis, comporte au moins tube de mesure (10), vibrant au moins partiellement en utilisation et destiné à guider un milieu fluide, ainsi qu’un système de capteur (50) servant à détecter des oscillations du tube de mesure (10). Le tube de mesure s’étend entre une première extrémité du côté de l’entrée du tube de mesure et une deuxième extrémité du côté de la sortie du tube de mesure avec une longueur d’oscillation (L10) et oscille en utilisation autour d’un axe d’oscillation coïncident avec un axe de liaison, ou parallèle à un axe de liaison supposé relier imaginairement les deux extrémités du tube de mesure, par exemple dans un mode d’oscillations de flexion. Le système de capteur génère, au moyen d’un premier capteur d’oscillations (51) disposé sur le tube de mesure, un premier signal primaire du convertisseur de mesure représentant des vibrations du tube de mesure (10) et, au moyen d’un deuxième capteur d’oscillations disposé sur le tube de mesure (10) à une certaine distance du premier capteur d’oscillations (52), un deuxième signal primaire du convertisseur de mesure représentant des vibrations du tube de mesure (10), une longueur d’une zone du premier tube de mesure (10) s’étendant entre le premier capteur d’oscillations et le deuxième capteur d’oscillation définissant une longueur de mesure (L50) du convertisseur de mesure. Avec le convertisseur de mesure selon l'invention, les capteurs d’oscillations du système de capteur sont placés dans le convertisseur de mesure de sorte que la condition (I) soit satisfaite par une sensibilité, SIST, du convertisseur de mesure par rapport à une sensibilité théorique en cas de longueur de mesure maximale (L10 = L50) correspondant à la longueur d’oscillations ainsi que par une amplitude de signal, AIST, des signaux primaires, effectivement obtenue en utilisation, par rapport à une amplitude d’oscillation maximale théorique possible, AMAX, sur le lieu de l’amplitude d’oscillation maximale.
EP10726082A 2009-07-24 2010-06-22 Convertisseur de mesure de type à vibrations ainsi qu appareil de mesure doté d un tel convertisseur de mesure Withdrawn EP2457067A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009028007A DE102009028007A1 (de) 2009-07-24 2009-07-24 Meßumwandler vom Vibrationstyp sowie Meßgerät mit einem solchen Meßwandler
PCT/EP2010/058799 WO2011009684A1 (fr) 2009-07-24 2010-06-22 Convertisseur de mesure de type à vibrations ainsi qu’appareil de mesure doté d’un tel convertisseur de mesure

Publications (1)

Publication Number Publication Date
EP2457067A1 true EP2457067A1 (fr) 2012-05-30

Family

ID=42705780

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10726082A Withdrawn EP2457067A1 (fr) 2009-07-24 2010-06-22 Convertisseur de mesure de type à vibrations ainsi qu appareil de mesure doté d un tel convertisseur de mesure

Country Status (5)

Country Link
US (1) US8113064B2 (fr)
EP (1) EP2457067A1 (fr)
CN (1) CN102472652B (fr)
DE (1) DE102009028007A1 (fr)
WO (1) WO2011009684A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009028006A1 (de) * 2009-07-24 2011-01-27 Endress + Hauser Flowtec Ag Meßwandler vom Vibrationstyp sowie Meßgerät mit einem solchen Meßwandler
DE102010039627A1 (de) 2010-08-20 2012-02-23 Endress + Hauser Flowtec Ag Meßaufnehmer vom Vibrationstyp sowie damit gebildetes Meßsystem
DE102010001973A1 (de) * 2010-02-16 2011-08-18 Endress + Hauser Flowtec Ag Messwandler vom Vibrationstyp mit zwei Gegenschwingerarmen
EP2705334B1 (fr) 2011-05-02 2018-01-24 Endress+Hauser Flowtec AG Capteur de mesure de type vibratoire et système de mesure formé avec ce capteur de mesure
RU2598160C1 (ru) 2012-08-21 2016-09-20 Майкро Моушн, Инк. Расходомер кориолиса и способ с улучшенной нулевой составляющей измерителя
DE102012108415A1 (de) * 2012-09-10 2014-06-12 Endress + Hauser Flowtec Ag Schnittstelle zwischen einer Sensoreinheit und einem explosionsfesten Gehäuse
DE102012018988A1 (de) * 2012-09-27 2014-04-17 Krohne Ag Coriolis-Massedurchflussmessgerät
DE102013114742A1 (de) * 2013-12-20 2015-06-25 Endress + Hauser Flowtec Ag Verfahren zum Fixieren eines Metallrohres an einem Metallkörper
CN104776891A (zh) * 2015-03-12 2015-07-15 孙晓君 一种质量流量传感器
DE102015112543A1 (de) * 2015-07-30 2017-02-02 Endress+Hauser Gmbh+Co. Kg Vorrichtung zur Bestimmung und/oder Überwachung zumindest einer Prozessgröße
US9719826B2 (en) * 2015-08-12 2017-08-01 Honeywell International Inc. Mass flow primary with exciter
DE102016108986A1 (de) * 2016-05-13 2017-11-16 Krohne Messtechnik Gmbh Verfahren zur Detektion von Rohrleitungsschwingungen und Messgerät
DE102016007905A1 (de) * 2016-06-30 2018-01-04 Endress+Hauser Flowtec Ag Verfahren zum Betreiben eines Messaufnehmers vom Vibrationstyp
DE102016112002B4 (de) * 2016-06-30 2023-03-23 Endress + Hauser Flowtec Ag Verfahren zum Bestimmen eines physikalischen Parameters eines kompressiblen Mediums mit einem Messaufnehmer vom Vibrationstyp und Messaufnehmer zur Durchführung eines solchen Verfahrens
DE102018119330B3 (de) 2018-08-08 2019-12-05 Endress+Hauser Flowtec Ag Spulenvorrichtung eines Schwingungssensors oder Schwingungserregers und Messaufnehmer bzw. Messgerät
CN112639413A (zh) * 2018-08-09 2021-04-09 高准公司 防爆馈通

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1001254A1 (fr) * 1998-05-29 2000-05-17 Oval Corporation Debitmetre massique de type coriolis
US20040040387A1 (en) * 2001-09-21 2004-03-04 Yuichi Nakao Arch-shaped tube type coriolis meter and method for determining shape of the coriolis meter
DE102004060115A1 (de) * 2004-12-13 2006-06-14 Endress + Hauser Flowtec Ag Meßaufnehmer vom Vibrationstyp
EP1995572A1 (fr) * 2006-03-14 2008-11-26 Oval Corporation Debitmetre coriolis dote de moyens de restriction du sens des vibrations

Family Cites Families (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823614A (en) 1986-04-28 1989-04-25 Dahlin Erik B Coriolis-type mass flowmeter
DE8712331U1 (fr) 1986-09-26 1988-01-28 Flowtec Ag, Reinach, Basel, Ch
US4823613A (en) * 1986-10-03 1989-04-25 Micro Motion, Inc. Density insensitive coriolis mass flow rate meter
US4738144A (en) 1986-10-03 1988-04-19 Micro Motion, Inc. Drive means for oscillating flow tubes of parallel path coriolis mass flow rate meter
US5050439A (en) 1986-10-28 1991-09-24 The Foxboro Company Coriolis-type mass flowmeter circuitry
US4777833A (en) 1986-11-12 1988-10-18 Micro Motion, Inc. Ferromagnetic drive and velocity sensors for a coriolis mass flow rate meter
GB2212613B (en) 1987-11-19 1991-07-03 Schlumberger Ind Ltd Improvements in single vibrating tube transducers
US4879911A (en) 1988-07-08 1989-11-14 Micro Motion, Incorporated Coriolis mass flow rate meter having four pulse harmonic rejection
GB8829825D0 (en) 1988-12-21 1989-02-15 Schlumberger Ind Ltd A combined output and drive circuit for a mass flow transducer
AU625788B2 (en) * 1989-06-09 1992-07-16 Micro Motion, Inc. Improved stability coriolis mass flow meter
US5009109A (en) 1989-12-06 1991-04-23 Micro Motion, Inc. Flow tube drive circuit having a bursty output for use in a coriolis meter
DE4124295A1 (de) 1991-07-22 1993-01-28 Krohne Ag Massendurchflussmessgeraet
EP0547455B1 (fr) 1991-12-19 1996-09-18 Krohne AG Débitmètre de masse
JP2758798B2 (ja) 1992-11-19 1998-05-28 株式会社オーバル コリオリ流量計
US5796011A (en) 1993-07-20 1998-08-18 Endress + Hauser Flowtech Ag Coriolis-type mass flow sensor
ES2133570T3 (es) 1993-07-21 1999-09-16 Flowtec Ag Sensor del caudal segun el principio de coriolis.
US5349872A (en) 1993-08-20 1994-09-27 Micro Motion, Inc. Stationary coils for a coriolis effect mass flowmeter
DK0685712T3 (da) 1994-05-26 2000-10-02 Flowtec Ag Massegennemstrømningsdetektor ifølge Coriolis-princippet
US5691485A (en) 1994-06-06 1997-11-25 Oval Corporation Coaxial double tube type Coriolis flowmeter
US5497666A (en) * 1994-07-20 1996-03-12 Micro Motion, Inc. Increased sensitivity coriolis effect flowmeter using nodal-proximate sensors
JP3132628B2 (ja) 1994-07-21 2001-02-05 富士電機株式会社 コリオリ式質量流量計
JP3565588B2 (ja) 1994-11-07 2004-09-15 エンドレス ウント ハウザー フローテック アクチエンゲゼルシャフト 振動型測定器
JPH08247816A (ja) 1995-03-09 1996-09-27 Fuji Electric Co Ltd 質量流量計
JP3547527B2 (ja) 1995-07-03 2004-07-28 エンドレス ウント ハウザー フローテック アクチエンゲゼルシャフト 質量流量計
JP3058074B2 (ja) * 1995-08-29 2000-07-04 富士電機株式会社 振動型測定器
DE59604029D1 (de) 1995-10-26 2000-02-03 Flowtec Ag Coriolis-Massedurchflussaufnehmer mit einem einzigen Messrohr
US5945609A (en) 1996-03-08 1999-08-31 Fuji Electric Co., Ltd. Mass flowmeter for measuring flow rate of a fluid
US5734112A (en) 1996-08-14 1998-03-31 Micro Motion, Inc. Method and apparatus for measuring pressure in a coriolis mass flowmeter
US5796012A (en) 1996-09-19 1998-08-18 Oval Corporation Error correcting Coriolis flowmeter
US5731527A (en) 1996-09-20 1998-03-24 Micro Motion, Inc. Coriolis flowmeters using fibers and anisotropic material to control selected vibrational flowmeter characteristics
US5804741A (en) 1996-11-08 1998-09-08 Schlumberger Industries, Inc. Digital phase locked loop signal processing for coriolis mass flow meter
US6047457A (en) 1997-03-17 2000-04-11 Endress + Hauser Flowtec Ag Method of fastening a metal body to a measuring tube of a coriolis-type mass flow sensor
US6073495A (en) 1997-03-21 2000-06-13 Endress + Hauser Flowtec Ag Measuring and operating circuit of a coriolis-type mass flow meter
US6223605B1 (en) 1997-04-10 2001-05-01 Endress + Hauser Flowtec Ag Coriolis-type mass flow sensor with a single measuring tube
US6311136B1 (en) 1997-11-26 2001-10-30 Invensys Systems, Inc. Digital flowmeter
US6092429A (en) 1997-12-04 2000-07-25 Micro Motion, Inc. Driver for oscillating a vibrating conduit
US5979246A (en) 1998-02-09 1999-11-09 Micro Motion, Inc. Spring rate balancing of the flow tube and a balance bar in a straight tube Coriolis flowmeter
DE19840782C2 (de) 1998-09-08 2001-09-06 Krohne Messtechnik Kg Massendurchflußmeßgerät
DE19908072C2 (de) 1999-02-12 2002-10-17 Krohne Ag Basel Massendurchflußmeßgerät
US6330832B1 (en) 1999-06-30 2001-12-18 Micro Motion, Inc. Coriolis flowmeter having a casing enclosed in a veneer
US6327915B1 (en) 1999-06-30 2001-12-11 Micro Motion, Inc. Straight tube Coriolis flowmeter
US6776052B2 (en) 1999-10-29 2004-08-17 Micro Motion, Inc. Coriolis flowmeter having a reduced flag dimension for handling large mass flows
DE10002635C2 (de) 2000-01-21 2003-02-20 Krohne Ag Basel Verfahren zur Bestimmung wenigstens einer charakteristischen Größe eines Massendurchflußmeßgeräts
US6651513B2 (en) 2000-04-27 2003-11-25 Endress + Hauser Flowtec Ag Vibration meter and method of measuring a viscosity of a fluid
US6711958B2 (en) 2000-05-12 2004-03-30 Endress + Hauser Flowtec Ag Coriolis mass flow rate/density/viscoy sensor with two bent measuring tubes
US6691583B2 (en) 2001-04-24 2004-02-17 Endress + Hauser Flowtec Ag Vibratory transducer
EP1253409A1 (fr) 2001-04-26 2002-10-30 Endress + Hauser Flowtec AG Circuit magnétique pour un capteur de mesure
US6666098B2 (en) 2001-05-23 2003-12-23 Endress + Hauser Flowtec Ag Vibratory transducer
US6920798B2 (en) 2001-09-21 2005-07-26 Endress + Hauser Flowtec Ag Vibratory transducer
DE10200768B4 (de) 2001-12-06 2004-03-11 Krohne Ag Massendurchflussmessgerät und Verfahren zum Betrieb eines Massendurchflussmessgerätes
AU2003227729A1 (en) 2002-05-08 2003-11-11 Endress + Hauser Flowtec Ag Torsional oscillation damper for a vibrating measuring transformer
US7040179B2 (en) 2002-12-06 2006-05-09 Endress+ Hauser Flowtec Ag Process meter
JP4565150B2 (ja) * 2003-05-12 2010-10-20 独立行政法人産業技術総合研究所 コリオリ流量計
DE10351310B4 (de) 2003-10-31 2009-08-13 Abb Ag Vorrichtung und Verfahren zum Betrieb eines Coriolis-Massendurchflussmessers
US7073396B2 (en) 2004-05-26 2006-07-11 Krohne Ag Coriolis mass flowmeter
US7077014B2 (en) 2004-06-23 2006-07-18 Endress + Hauser Flowtec Ag Vibration-type measuring transducer
JP3812844B2 (ja) * 2004-09-17 2006-08-23 株式会社オーバル 三次モード振動式コリオリ流量計
US7299699B2 (en) 2004-10-05 2007-11-27 Endress + Hauser Flowtec Ag Composite system, method for its manufacture, and measurement pickup using such a composite system
KR20090105979A (ko) 2004-11-30 2009-10-07 마이크로 모우션, 인코포레이티드 밀도 정보를 이용하여 유량 압력을 측정하기 위한 방법 및 장치
DE102005013770B4 (de) 2004-12-01 2007-09-06 Krohne Ag Verfahren zum Betreiben eines Massendurchflussmessgeräts
US7200503B2 (en) 2004-12-29 2007-04-03 Endrss + Hauser Flowtec Ag Field device electronics fed by an external electrical energy supply
US7392709B2 (en) 2005-05-16 2008-07-01 Endress + Hauser Flowtec Ag Inline measuring device with a vibration-type measurement pickup
US7475603B2 (en) 2005-11-15 2009-01-13 Endress + Hauser Flowtec Ag Measurement transducer of vibration-type
US7490521B2 (en) 2005-11-15 2009-02-17 Endress + Hauser Flowtec Ag Measurement transducer of vibration type
US7472607B2 (en) 2005-11-15 2009-01-06 Endress + Hauser Flowtec Ag Measurement transducer of vibration type
US7360451B2 (en) 2005-12-22 2008-04-22 Endress + Hauser Flowtec Ag Measuring transducer of vibration-type
US7325462B2 (en) 2005-12-22 2008-02-05 Endress + Hauser Flowtec Ag Measuring transducer of vibration-type
DE102005062004A1 (de) * 2005-12-22 2007-06-28 Endress + Hauser Flowtec Ag Meßwandler vom Vibrationstyp
JP5193185B2 (ja) 2006-05-01 2013-05-08 マイクロ・モーション・インコーポレーテッド 単一の流れ導管を備えるコリオリ流量計、動作させる方法、及び、製造する方法
JP5060557B2 (ja) 2006-07-28 2012-10-31 マイクロ・モーション・インコーポレーテッド ３つのピックオフ・センサを持つ流量計
US7730792B2 (en) 2006-12-18 2010-06-08 Abb Patent Gmbh Method and device for compensation for influences, which interfere with the measurement accuracy, in measurement devices of the vibration type
DE102007061690A1 (de) 2006-12-21 2008-06-26 Abb Ag Verfahren zum Betrieb eines Messgerätes vom Vibrationstyp sowie Messgerät von Vibrationstyp selbst
DE102009028006A1 (de) * 2009-07-24 2011-01-27 Endress + Hauser Flowtec Ag Meßwandler vom Vibrationstyp sowie Meßgerät mit einem solchen Meßwandler

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1001254A1 (fr) * 1998-05-29 2000-05-17 Oval Corporation Debitmetre massique de type coriolis
US20040040387A1 (en) * 2001-09-21 2004-03-04 Yuichi Nakao Arch-shaped tube type coriolis meter and method for determining shape of the coriolis meter
DE102004060115A1 (de) * 2004-12-13 2006-06-14 Endress + Hauser Flowtec Ag Meßaufnehmer vom Vibrationstyp
EP1995572A1 (fr) * 2006-03-14 2008-11-26 Oval Corporation Debitmetre coriolis dote de moyens de restriction du sens des vibrations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011009684A1 *

Also Published As

Publication number Publication date
WO2011009684A1 (fr) 2011-01-27
US8113064B2 (en) 2012-02-14
CN102472652B (zh) 2014-10-29
DE102009028007A1 (de) 2011-01-27
CN102472652A (zh) 2012-05-23
US20110023624A1 (en) 2011-02-03

Similar Documents

Publication Publication Date Title
WO2011009683A1 (fr) Convertisseur de mesure de type à vibrations ainsi qu’appareil de mesure doté d’un tel convertisseur de mesure
WO2011009684A1 (fr) Convertisseur de mesure de type à vibrations ainsi qu’appareil de mesure doté d’un tel convertisseur de mesure
EP2406592B1 (fr) Système de mesure comprenant un transducteur du type vibrant
EP2502032B1 (fr) Système de mesure muni d'un ensemble de tubes présentant deux tubes de mesure parcourus en parallèle par un milieu et procédé de surveillance dudit ensemble du tubes
EP2406589B1 (fr) Système de mesure pour des fluides s'écoulant dans une canalisation
EP2519805B1 (fr) Système de mesure comportant un convertisseur de mesure de type vibrant et procédé pour mesurer une différence de pression
EP2606319B1 (fr) Système de mesure présentant un transducteur de type vibratoire
EP3080560B1 (fr) Dispositif pour mesurer la densité
DE102011006971A1 (de) Meßwandler vom Vibrationstyp sowie Verfahren zu dessen Herstellung
WO2012062551A1 (fr) Système de mesure comprenant un convertisseur de mesure du type à vibration
EP2694927A1 (fr) Procédé de réglage fin d'un tube
EP2519806B1 (fr) Système de mesure avec transducteur de type à vibrations
EP2694929B1 (fr) Procédé de réglage fin d'un tube
EP2519804B1 (fr) Système de mesure comportant un convertisseur de mesure de type vibrant
DE102010000759A1 (de) Meßsystem mit einem Meßwandler vom Vibrationstyp
DE102010000760B4 (de) Meßsystem mit einem Meßwandler vom Vibrationstyp zum Messen eines statischen Drucks in einem strömenden Medium
DE102010000761A1 (de) Meßsystem mit einem Meßwandler vom Vibrationstyp
EP2834603B1 (fr) Transducteur de mesure de type vibratoire
DE102012102947B4 (de) Meßwandler vom Vibrationstyp
EP2694928A1 (fr) Transformateur de mesure de type à vibrations et procédé de production

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20111219

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20170731

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20190502