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公开(公告)号：US20250093189A1
公开(公告)日：2025-03-20
申请号：US18920287
申请日：2024-10-18
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder , Yaoying Lin , Robert Lalla , Reinhard Huber
Abstract: A measuring device for determining density, mass flow rate and/or viscosity of a flowable medium includes: an oscillator including at least one oscillatable measuring tube for conveying the medium, and having at least one oscillatory mode, whose eigenfrequency depends on density of the medium; an exciter for exciting the oscillatory mode; at least one oscillation sensor for registering oscillations of the oscillator; and an operating-evaluating circuit, which is adapted to supply the exciter with an excitation signal, to register signals of the oscillation sensor, based on the signals of the oscillation sensor to ascertain current values of the eigenfrequency of the oscillator as well as variations of the eigenfrequency, and to determine a value characterizing density variations of the medium, wherein the value depends on a function, which is proportional to the variation of the eigenfrequency and has an eigenfrequency dependent normalization.
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公开(公告)号：US20250067586A1
公开(公告)日：2025-02-27
申请号：US18720940
申请日：2022-12-02
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder , Wolfgang Drahm , Yaoying Lin
Abstract: The method determines a characteristic passage time of a component of a flowing medium in a vibrating measuring tube of a Coriolis mass flow meter. The flow meter has the measuring tube, an exciter for exciting a bending vibration mode of the measuring tube, and a vibration sensor for sensing the measuring tube vibrations. The component is present inhomogenously in the medium and has a component density which deviates from an average density of the medium. The method includes feeding an excitation signal to the exciter with a natural frequency a bending vibration mode, ascertaining at least one first time profile of a signal amplitude of the first vibration sensor at a natural frequency of an anti-symmetrical bending vibration mode, and ascertaining the characteristic passage time on the basis of the first time profile of the signal amplitude at the natural frequency of the anti-symmetrical bending vibration mode.
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公开(公告)号：US20240426770A1
公开(公告)日：2024-12-26
申请号：US18698446
申请日：2022-09-22
Applicant: Endress+Hauser Flowtec AG
Inventor： Mohammad Sadegh Ebrahimi , Dietmar Frühauf , Volker Frey , Raphael Kuhnen , Wolfgang Drahm , Stefan Pflüger , Anne Habermehl , Hao Zhu
IPC: G01N22/00
Abstract: A method for distinguishing between the presence of a foreign body and a gas bubble in a flowable medium in a pipeline or a container includes evaluating received microwave signals, wherein mechanical vibrations are introduced into the medium by means of which a gas bubble present in the medium is set into vibration. A gas bubble is detected only in the event that when mechanical vibrations are introduced and the received microwave signals or the value derived therefrom is/are modulated; otherwise, a foreign body is detected. Also disclosed is a system which is suitable for carrying out the method according to the present disclosure.
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公开(公告)号：US20240344870A1
公开(公告)日：2024-10-17
申请号：US18294811
申请日：2022-07-22
Applicant: Endress+Hauser Flowtec AG
Inventor： Johan Pohl , Rémy Scherrer , Hao Zhu
CPC classification number: G01F1/8436 , G01F1/8422 , G01F1/8427 , G01F1/8459 , G01N9/32
Abstract: A method for operating a Coriolis measurement device comprises: recording the measured voltages from the sensors and creating an asymmetric sequence of values using the amplitudes of the measured voltages for the purpose of diagnosing the Coriolis measurement device; checking whether the asymmetric sequence of values satisfies at least one invalidity criterion; and creating a stabilized asymmetric sequence of values on the basis of the asymmetric sequence of values by replacing asymmetric measured values with substitute values. While an invalidity criterion is satisfied a last valid measured value of the asymmetric sequence of values is used as the current value of the stabilized asymmetric sequence of values, or the stabilized asymmetric sequence of values is set to a predetermined value, a first invalidity criterion being based on a scattering parameter of the asymmetric value exceeding a first limit value.
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公开(公告)号：US12061105B2
公开(公告)日：2024-08-13
申请号：US17757219
申请日：2020-11-20
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu
CPC classification number: G01F1/8436 , G01F1/50 , G01N9/32 , G01N11/08
Abstract: The present disclosure relates to a method for operating a flow measuring point for media having at least one liquid phase, the flow measuring point including: a Coriolis measuring device for measuring the mass flow rate and the density of a medium flowing through a pipeline; and a pressure-difference measuring apparatus for sensing the pressure difference between a flow region arranged upstream of the Coriolis measuring device and a flow region arranged downstream of the Coriolis measuring device, wherein a flow measurement based on measured values of the pressure difference is corrected by means of measured values acquired using the Coriolis measuring device.
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Patent Agency Ranking
公开(公告)号：US12044559B2
公开(公告)日：2024-07-23
申请号：US17758082
申请日：2020-12-01
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Josef Hubensteiner
CPC classification number: G01F1/34 , G01F1/8477
Abstract: A method for monitoring flow of a medium by means of a pressure difference measuring device and a Coriolis mass flowmeter having two oscillators, which comprise, in each case, a bent measuring tube pair, which are arranged on top of one another and connected for parallel flow between the two pressure measuring points of the pressure difference measuring device, comprising steps as follows: Registering a pressure difference between the first pressure measuring point and the second pressure measuring point; registering a first density measured value based on at least a first oscillation frequency of the first oscillator; registering a second density measured value based on at least a second oscillation frequency of the second oscillator; ascertaining a flow measured value based on the pressure difference, when a difference between the first density measured value and the second density measured value is less than a density difference limit value.
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公开(公告)号：US20240210295A1
公开(公告)日：2024-06-27
申请号：US18555387
申请日：2021-03-21
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder
IPC: G01N9/00
CPC classification number: G01N9/002 , G01N2009/006
Abstract: A method for operating a density meter that includes at least one oscillating measuring tube for conducting a medium, an exciter disposed on the measuring tube for exciting oscillation modes of the at least one measuring tube, and a support body, wherein the measuring tube has inlet-side and outlet-side end portions that are connected to the support body, includes: exciting at least three oscillation modes of the measuring tube; determining eigenfrequency measurement values of the at least three oscillation modes; determining a density measurement value of the medium, taking into consideration a gas load that may be present; and determining a characteristic property of the at least one measuring tube on the basis of the eigenfrequencies of the three oscillation modes.
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公开(公告)号：US11788875B2
公开(公告)日：2023-10-17
申请号：US16629071
申请日：2018-06-19
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Rémy Scherrer
IPC: G01F1/84
CPC classification number: G01F1/8477 , G01F1/8422 , G01F1/8427 , G01F1/8436
Abstract: Disclosed is a measurement pickup for determining the mass flow rate of a liquid comprising: at least one measurement tube for carrying the liquid having an inlet-side end section and an outlet-side end section; a support body on which the measurement tube is mounted an exciter for exciting vibrations of the measurement tube; at least one vibration sensor for detecting vibrations of the measurement tube; an operating and evaluation circuit for driving the exciter, for receiving the signals of the vibration sensor, and for ascertaining a measured value representing the mass flow rate. The operating and evaluation circuit comprises an adaptive low-pass filter for filtering the sequence of measured values representing the mass flow rate, wherein the low-pass filter has at least one filter parameter dependent on at least one adaptive controlled variable that, for its part, is dependent on the gas content of the test medium.
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公开(公告)号：US20230184573A1
公开(公告)日：2023-06-15
申请号：US17996800
申请日：2021-03-23
Applicant: Endress+Hauser Flowtec AG
Inventor： Alfred Rieder , Hao Zhu
IPC: G01F1/84
CPC classification number: G01F1/8436
Abstract: The present disclosure relates to a method used to monitor a Coriolis mass flow meter, which has an oscillator with at least one measurement tube, the method including: exciting the oscillator so as to cause flexural vibrations of a first antisymmetric vibration mode by an excitation signal at a resonance frequency of the first antisymmetric vibration mode; sensing a vibration amplitude of the first antisymmetric vibration mode at the resonance frequency of the first antisymmetric vibration mode; sensing a time constant of the decaying free vibrations of the first antisymmetric vibration mode; and determining a modal elastic property of the oscillator with respect to the first antisymmetric vibration mode on the basis of the vibration amplitude of the first antisymmetric vibration mode, the excitation signal, and the time constant.
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10.发明授权公开(公告)号：US11573111B2
公开(公告)日：2023-02-07
申请号：US16315834
申请日：2017-06-26
Applicant: Endress + Hauser Flowtec AG
Inventor： Alfred Rieder , Gerhard Eckert , Ennio Bitto , Hao Zhu
Abstract: The measuring system includes a transducer apparatus with two tubes. Each tube is adapted to be flowed through by a fluid from an inlet end toward an outlet end and to be caused to vibrate. An electromechanical exciter mechanism excites and maintains mechanical oscillations of each of the tubes, and a sensor arrangement registers mechanical oscillations of at least one of the tubes. The transducer apparatus includes two temperature sensors each being mechanically and thermally conductively coupled with a wall of the tube, wherein each of the temperature sensors registers a measuring point temperature, and converts such into a temperature measurement signal temperature. A measuring and operating electronics (ME) generates a transducer temperature measured value representing a transducer apparatus temperature so that a magnitude of the transducer temperature measured value is greater than a magnitude of the measuring point temperature and less than a magnitude of the measuring point temperature.
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