公开(公告)号：US20230032534A1

公开(公告)日：2023-02-02

申请号：US17758082

申请日：2020-12-01

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu ,  Josef Hubensteiner

IPC: G01F1/34 ,  G01F1/84

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.

公开(公告)号：US20220334038A1

公开(公告)日：2022-10-20

申请号：US17616973

申请日：2020-05-04

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu ,  Michael Wiesmann

IPC: G01N9/32 ,  G01N11/04 ,  G01F1/84

Abstract: A measuring device for determining the density, the mass flow and/or the viscosity of a gas-charged liquid includes an oscillator, having a media-conducting measuring tube and two vibrational modes having media-density-dependent natural frequencies; an exciter for exciting the two vibrational modes; a vibrational sensor for detecting vibrations of the oscillator; and an operating and evaluating circuit to apply an excitation signal to the exciter, detect signals of the vibration sensor, determine current values of the natural frequencies of the two vibrational modes of the oscillator and fluctuations of the natural frequencies. The operating and evaluating circuit is designed to determine a first media state value, wherein the operating and evaluating circuit is furthermore designed to determine a second media state value which represents a gas charge of the medium.

公开(公告)号：US20220236160A1

公开(公告)日：2022-07-28

申请号：US17612540

申请日：2020-04-15

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu ,  Gerhard Eckert ,  Ennio Bitto ,  Alfred Rieder ,  Marc Werner

IPC: G01N9/00 ,  G01F1/84

Abstract: A measuring transducer includes a tube assembly including two pair of structurally identical tubes, each connected at their respective ends to each of two flow dividers, thereby forming four parallel flow paths, and each including alternating, adjoining straight and arcuate segments, wherein each of the first and third arcuate segments has a segment length corresponding to an extended length of a virtual center line of the segment, an arc radius corresponding to a radius of the virtual center line and a center point angle corresponding to a ratio between the segment length and the arc radius, such that each of the first arcuate segments are identical in both shape and size, and such that each of the third arcuate segments are identical in both shape and size, wherein the measuring transducer further includes an exciter assembly and a sensor assembly, each connected to the tube assembly.

公开(公告)号：US11378432B2

公开(公告)日：2022-07-05

申请号：US16764105

申请日：2018-10-30

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu ,  Alfred Rieder

IPC: G01F1/84

Abstract: The Coriolis flowmeter according to the present disclosure includes: a measuring sensor including a bent measuring tube mirror-symmetrical with respect to a transverse plane, wherein a measuring tube center line runs in a longitudinal plane oriented perpendicular to the transverse plane, wherein an equatorial surface runs perpendicular to the longitudinal plane along the measuring tube center line; an exciter for exciting measuring tube bending vibrations; a first pair of vibration sensors for capturing the bending vibrations of the measuring tube; and an operating and evaluation circuit for driving the exciter, for capturing signals from the vibration sensors, and for determining a mass flow measured value, wherein the measuring sensor has a second pair of vibration sensors, which are arranged in a mirror-symmetrical manner with respect to the transverse plane, wherein the first pair of vibration sensors is separated from the second pair of vibration sensors by the equatorial surface.

公开(公告)号：US20220099470A1

公开(公告)日：2022-03-31

申请号：US17298050

申请日：2019-10-31

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu ,  Wolfgang Drahm

IPC: G01F7/00 ,  G01F1/34 ,  G01F1/84

Abstract: Disclosed is a method for determining a flowed amount of a medium using a first flow measuring transducer according to a first measuring principle and a second flow measuring transducer according to a second measuring principle. The measured values of the first transducer are more reliable in first states of the medium than measured values of the second transducer, and the second measured values are more reliable in second states than the first measured values. A contribution to the flowed amount is ascertained based on the more reliable measured values. The contribution to the flowed amount based on the second measured values is ascertained by means of a transfer function. An updated version of the transfer function is ascertained when the first measured values are more reliable, and the flowed amount earlier ascertained based on the second measured values is corrected as a function of the updated transfer function.

公开(公告)号：US10942058B2

公开(公告)日：2021-03-09

申请号：US16315826

申请日：2017-06-26

Applicant: Endress + Hauser Flowtec AG

Inventor： Alfred Rieder ,  Gerhard Eckert ,  Ennio Bitto ,  Hao Zhu

IPC: G01F1/84 ,  G01F25/00 ,  G01F15/02 ,  G01N11/16 ,  G01N9/00

Abstract: The measuring system comprises a transducer apparatus with two tubes, each having a lumen surrounded by a wall. A fluid flows through each tube, while the tube is vibrated. An electromechanical-exciter mechanism 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 a respective one of the tubes and adapted to register a measuring point temperature and to convert such into a temperature measurement signal. A measuring- and operating electronics is adapted, with application of the temperature measurement signals, to generate a transducer temperature measured value, which represents a transducer apparatus temperature, which deviates both from each of the measuring point temperatures, such that a magnitude of the transducer temperature measured value is between the measuring point temperatures.

公开(公告)号：US20200319007A1

公开(公告)日：2020-10-08

申请号：US16759097

申请日：2018-10-02

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu

IPC: G01F1/84

Abstract: The present disclosure relates to a Coriolis mass flow meter including two measuring tube pairs each having two measuring tubes mounted as to oscillate relative to one another and have a bending vibration excitation mode of different excitation mode natural frequencies, each pair having an electrodynamic exciter and a vibration sensor pair including a first inlet-side vibration sensor and a first outlet-side vibration sensor, and further includes a circuit configured to determine phase difference-dependent mass flow measurement values, wherein a difference deviation between a first relative signal amplitude difference of sensor signals having the first excitation mode natural frequency and a second relative signal amplitude difference of sensor signals having the second excitation mode natural frequency is not more than a tolerance value.

公开(公告)号：US10768034B2

公开(公告)日：2020-09-08

申请号：US16471656

申请日：2017-11-22

Applicant: Endress+Hauser Flowtec AG

Inventor： Hao Zhu ,  Alfred Rieder ,  Ennio Bitto ,  Gerhard Eckert

IPC: G01F1/84 ,  G01N9/00

Abstract: The present disclosure relates to a measurement sensor of the vibrational type for measuring the density and/or the mass flow of a medium, including: two oscillators; an exciter for stimulating oscillator vibrations; and two vibration sensors, wherein the first oscillator includes first and second measuring tubes and a first resilient vibration coupler for coupling the measuring tubes, wherein the second oscillator includes third and fourth measuring tubes and a second resilient vibration coupler for coupling the third and fourth measuring tubes, wherein perpendicularly to a measuring tube transverse plane a measurement sensor longitudinal plane extends between the third and the fourth measuring tube, wherein the first and third measuring tube relative to a measurement sensor longitudinal plane are in mirror symmetry relative to one another, and wherein the second and fourth measuring tube relative to the measurement sensor longitudinal plane are in mirror symmetry relative to one another.

公开(公告)号：US10466151B2

公开(公告)日：2019-11-05

申请号：US15540046

申请日：2015-11-18

Applicant: Endress + Hauser Flowtec AG

Inventor： Gerhard Eckert ,  Alfred Rieder ,  Hao Zhu

IPC: G01N9/00 ,  G01N11/04 ,  G01N11/16 ,  G01F1/84

Abstract: A method is provided for measuring density of a fluid by means of at least one at least sectionally curved measuring tube. The measuring tube is adapted to be flowed through by the fluid and concurrently to be caused to vibrate over a wanted oscillatory length, namely a tube length measured from a first tube end to a second tube end, a length which is greater than a minimum separation of the second tube end from the first tube end. According to the invention, among other things, also a tilt measured value representing an inclination of the at least one measuring tube in the static resting position relative to a local acceleration of gravity is ascertained, in such a manner that such represents an angle of intersection between a direction vector of an imaginary first reference axis (y-axis) and a direction vector of an imaginary second reference axis (g-axis). The first reference axis is so selected that it is perpendicular to an imaginary third reference axis (z-axis) imaginarily connecting the first tube end and the second tube end and points in the direction of a peak of the at least one measuring tube farthest from the third reference axis in the static resting position, while the second reference axis is so selected that it extends through a shared intersection of the first and third reference axes and points in the vertical direction, namely in the direction of the local acceleration of gravity. The tilt measured value is used together with a parameter measured value representing an oscillation frequency of the at least one measuring tube for ascertaining at least one density measured value representing the density of the fluid.

公开(公告)号：US20190162702A1

公开(公告)日：2019-05-30

申请号：US16302769

申请日：2017-04-27

Applicant: Endress+Hauser Flowtec AG

Inventor： Alfred Rieder ,  Gerhard Eckert ,  Ennio Bitto ,  Hao Zhu

IPC: G01N29/22 ,  G01F1/84 ,  G01N9/00 ,  G01N29/02

Abstract: A measuring transducer includes a support body, a curved oscillatable measuring tube, an electrodynamic exciter, at least one sensor for registering oscillations of the measuring tube, and an operating circuit. The measuring tube has first and second bending oscillation modes, which are mirror symmetric to a measuring tube transverse plane and have first and second media density dependent eigenfrequencies f1, f3 with f3>f1. The measuring tube has a peak secant with an oscillation node in the second mirror symmetric bending oscillation mode. The operating circuit is adapted to drive the exciter conductor loop with a signal exciting the second mirror symmetric bending oscillation mode. The exciter conductor loop has an ohmic resistance RΩ and a mode dependent mutual induction reactance Rg3 which depends on the position of the exciter. The exciter is so positioned that a dimensionless power factor pc 3 = 4 · R Ω · R g   3 ( R Ω + R g   3 ) 2 has a value of not less than 0.2.