Endress + Hauser Flowtec Ag

Endress+hauser Gmbh+co. Kg

Endress + Hauser Process Solutions Ag

Hao Zhu

Alfred Rieder

Wolfgang Drahm

Ennio Bitto

Gerhard Eckert

Christof Huber

Robert Lalla

Marcel Braun

Michael Wiesmann

Vivek Kumar

Yaoying Lin

Martin Josef Anklin

Michael Kirst

Holger Bernhard

Andreas Güttler

Christian Schutze

Dietmar Frühauf

Raphael Kuhnen

Marc Werner

Stefan Pflüger

Claude Hollinger

Daniel Kuttler

Reinhard Huber

Josef Hubensteiner

Patrick Oudoire

Rémy Scherrer

Johan Pohl

Jerry E Stevens

Mohammad Sadegh Ebrahimi

Anne Habermehl

Volker Frey

Peter Tschabold

Marco Oliver Scherrer

Bernd Josef Schäfer

Yaoing Lin

Stefan PFLÜGER

Bernd-Josef SCHÄFER

A density measurement reading of a medium is determined using a Coriolis mass flow transmitter with two oscillators with pairs of measuring tubes arranged one above the other in parallel flow and leading into collectors. The mounting of the transmitter in the pipeline causes mechanical voltages that influence the oscillators via the collectors. The method includes excitation of a vibration mode of the oscillators and a determination of the natural frequency of the excited vibration modes. The method also includes a determination of a preliminary density measurement reading based on the natural frequencies and a deviation between the preliminary density measurement readings. A corrected density measurement reading is determined using a model, which determines and corrects the influence of mechanical voltages on the density measurement based on the deviation.

Method for determining a density measurement reading and Coriolis mass flow transmitter for carrying out the method

A method for determining variables influencing a total zero point error of a Coriolis mass flow meter comprises: exciting a vibration of a bending vibration mode; measuring a first total zero point error T at a flow of zero; ascertaining a first damping value D of the vibration of the bending vibration mode; measuring an exciter-independent zero point error I during a decaying vibration of the bending vibration mode at a flow of zero; ascertaining a first exciter-dependent contribution E to the first total zero point error T based on the first total zero point error T and based on the exciter-independent zero point error I; and ascertaining a sensitivity factor S for the bending vibration mode based on the first exciter-dependent contribution E to the total zero point error T and based on the first damping value D.

Coriolis mass flow meter and method for determining variables influencing the total zero point error of the meter, method for determining the total zero point error and operating method for same

A method for characterizing the gas load of a medium, which comprises a liquid loaded with gas, using a measurement sensor that guides the medium in at least one vibrating measurement tube, includes: determining a speed of sound value and a resonator density value of the medium based on natural frequencies of at least two different vibration modes of the measurement tube; determining a measured pressure value for the medium guided in the measurement tube; determining a gas volume content of suspended bubbles in the medium based on the resonator density value, the speed of sound value and the measured pressure value; and determining a value for the gas volume content of free bubbles based on the resonator density value of the medium and the gas volume content of suspended bubbles.

Method for characterizing the gas load of a medium, and density meter therefor

A method for operating a Coriolis measurement device comprises the following steps: recording the measured voltages of sensors for sensing measuring tube vibrations and creating an asymmetric sequence of values by way of the amplitudes of the measured voltages for the purpose of diagnosing the Coriolis measurement device, recording at least one stabilization variable and creating a stabilized asymmetric sequence of values based on the stabilization variable, wherein the stabilization variable is one of the following variables or a first or further temporal derivative thereof: a resonant frequency of the measuring tube containing medium or a variable derived therefrom, time or phase difference between measurement signals from the first sensor and the second sensor or a variable derived therefrom, temperature of the measuring tube wall, temperature difference between two measurement points of the measuring tube wall.

Method for operating a Coriolis measurement device

A measuring transducer includes a tube arrangement having a bent tube, an equally embodied tube, a bent tube and a tube embodied equally to the tube, and two flow dividers each having four flow openings. The measuring transducer includes an exciter for exciting and maintaining mechanical oscillations of the tube arrangement and a sensor for registering mechanical oscillations of the tube arrangement and for producing oscillation measuring signals. Each tube is connected to each flow divider to form four parallel flow paths, having a straight segment connected with the flow divider, an arc shaped segment following such straight segment, a straight segment following such arc shaped segment, an arc shaped segment following such straight segment, a straight segment following such arc shaped segment, an arc shaped segment following such straight segment, and a straight segment following such arc shaped segment and is connected with the flow divider.

Vibration-type measuring transducer and vibronic measuring system formed therewith

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.

Method for monitoring a Coriolis mass flow meter

A method includes registering a first mass flow rate portion measurement value {dot over (m)}of a first flow portion through measuring tubes of a first oscillator and a second mass flow rate portion measurement value {dot over (m)}of a second flow portion through measuring tubes of the second oscillator. A sum of the two mass flow rate portion measurement values gives a mass flow rate total measurement value. The method also includes registering first and second density portion measurement values ρ, ρof the medium in the flow portions and calculating the effective density measurement value pas a function of the density portion measurement values ρ, ρwith weightings dependent on the mass flow rate portion measurement values {dot over (m)}, {dot over (m)}. The different weighting functions are applied for ascertaining the weightings as a function of the mass flow rate portion measurement values.

Method for determining a density measurement value or a measurement value of a density-dependent measurand, and Coriolis mass flowmeter for performing the method

The disclosure relates to a measuring device for characterizing a non-homogeneous, flowable medium, and for determining the density, the mass flow rate and/or the viscosity of the medium measuring tube for guiding the medium. includes at least one mode of oscillation, the natural frequency of which depends on the density of the medium An exciter for exciting the mode of oscillation and an operation and evaluation circuit designed to apply an excitation signal to the exciter, to capture signals from the oscillation sensor, to determine current values of the natural frequency of the oscillator and fluctuations of the natural frequency on the basis of the signals from the oscillation sensor.

Measuring device and method for characterizing a non-homogeneous, flowable medium

A method for the measurement of a physical parameter of a liquid by means of a sensor having at least one measuring tube for conducting the liquid, wherein the measuring tube can be excited to vibrate in at least one flexural vibration mode, comprises: determining at least one current value of a vibration parameter of the flexural vibration mode; determining a measurement value of the physical parameter according to the current value of the vibration parameter, wherein the measurement value is compensated in respect of the resonator effect according to a current value for the natural frequency of the flexural vibration mode and according to the sound velocity of the liquid conducted in the measuring tube, wherein the value for the sound velocity is provided independently of the vibrations of the measuring tube.

Method for ascertaining a physical parameter of a charged liquid

An arrangement includes a pipeline and a Coriolis volumetric flow meter for measuring a mass flow rate of a medium flowing through the pipeline. A first pressure sensor is attached at an inlet-side of the pipeline and a second pressure sensor is attached at an outlet-side of the pipeline, or wherein a differential pressure sensor is configured to detect a difference between an inlet-side and an outlet-side. The pressure sensors and/or the differential pressure sensor are configured to measure a media pressure and to determine, for each differential pressure, a volumetric flow velocity of the medium through the pipeline. A first monitoring sensor is attached at an inlet-side portion of the pipeline and a second monitoring sensor is attached at an outlet-side portion of the pipeline, wherein the monitoring sensors are configured to monitor a measurement variable different from the media pressure to identify a static media state.

Arrangement and method for identifying and correcting a faulty volumetric flow measurement

A measuring tube arrangement of a measuring device for detecting a mass flow rate of a flowable medium includes: two measuring tubes for conducting the medium, wherein the measuring tubes each have an inlet and an outlet, wherein the measuring tubes are bent at least once between the inlet and outlet; a coupler arrangement for mechanically coupling the two measuring tubes, wherein the coupler arrangement has at least two coupler elements, wherein one coupler element is arranged at the inlet, and one coupler element is arranged at the outlet; two magnet arrangements, each having at least two magnets, arranged on the measuring tubes, wherein precisely one magnet arrangement is arranged on one measuring tube; and a connecting body configured to mechanically detachably connect the measuring tube arrangement to a carrier unit, wherein the connecting body is connected to the inlet and to the outlet of the respective measuring tubes.

Measuring tube arrangement and carrier unit of a measuring device for detecting a parameter of a flowable medium

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.

Method for operating a flow measuring point for media having at least one liquid phase

A method for ascertaining a physical parameter of a liquid, which has a gas charge using a measuring transducer having a measuring tube for conveying the medium. The measuring tube executes oscillations in bending oscillation mode. The method includes: exciting the measuring tube with an eigenfrequency of a bending oscillation mode—or f-mode, ascertaining a suppressed excitation frequency, at which the oscillation amplitude of the measuring tube is minimum; identifying the frequency as the resonant frequency of the gas-charged liquid; ascertaining a density correction term as a function of the resonant frequency for correcting a preliminary density measured value and/or mass flow correction term as a function of the resonant frequency for correcting a preliminary mass flow rate measured value, and/or ascertaining the velocity of sound in the gas-charged liquid in the measuring tube as a function of the resonant frequency.

Method for ascertaining a physical parameter of a gas-charged liquid

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.

Method for monitoring a flow of a medium by means of a Coriolis mass flowmeter and a differential pressure measurement device

The flow measuring system comprises a measuring transducer having a tube arrangement to convey a flowing fluid, an exciter arrangement for forced mechanical oscillations of the tube arrangement, and a sensor arrangement for registering mechanical oscillations of the tube arrangement. The measuring system further comprises a measuring and operating electronics electrically coupled with the exciter arrangement and the sensor arrangement. The measuring system has two driver circuits and two measurement transmitter circuits. The tube arrangement includes two flow dividers and four connected tubes adapted to be flowed through by the measured substance. The exciter arrangement includes two oscillation exciters, and the sensor arrangement includes four oscillation sensors. The first measurement transmitter circuit processes measurement signals from two oscillation sensors and outputs such to the second measurement transmitter circuit The second measurement transmitter circuit processes oscillation measurement signals of the other two oscillation sensors and ascertains total flow measured values.

Vibronic measuring system with two driver circuits and two measurement transmitter circuits each in communication with an exciter and a pair of sensors

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Freising, Germany

Hao Zhu