Krohne Ag

Other

Technische Universiteit Delft

Krohne Messtechnik Gmbh

Focus-on V.o.f.

Cornelis Johannes Hogendoorn

Olaf Jean Paul Bousché

Jeroen Martin Van Klooster

Arie Huijzer

Michael Vogt

Marco Leendert Zoeteweij

Rutger Reinout Tromp

Jan Teunis Aart Pors

Lucas Matias Ceferino Cerioni

Marcel Meijlom Molenaar

Jeroen Van Den Berg

John Justin Freeman

Matthias Appel

Alexander Marnix Heijnsdijk

Ariël De Graaf

Jan-Willem Ramondt

Sabiju Valiya Valappil

Arthur Den Haan

Alejandro Marcos Aragón

Stefan Van Caspel

Jan Aart Van Bekkum

John C Visser

Yves Louis Janssens

Olaf Jean Bousche

Jan Teunis Pors

Olaf Jean Paul BouschÉ

Marcel Meijlom Molennar

Marcerl Meijlom Molennar

A computer-implemented method for operating a shut-off device for a fluid includes: using a mathematical model to calculate a current static fluid pressure at a location of interest within a shut-off device as a function of at least one measured state variable of the fluid; determining a vapor pressure of the fluid; comparing a current static fluid pressure with a cavitation limit value which is dependent on a vapor pressure of the fluid; and in the event of the calculated current static fluid pressure falling below the cavitation limit value dependent on the vapor pressure of the fluid, signaling the presence or expected presence of cavitation at the location of interest of the shut-off device. A related shut-off device is also disclosed.

Computer-implemented method for operating a shut-off device for a fluid and a corresponding shut-off device

A magnetic-inductive flowmeter includes a measuring tube for guiding an electrically conductive medium, a magnetic field device, a magnetic field guiding device, and a control and evaluation unit. The magnetic field device includes at least three coils for generating a magnetic field through the measuring tube. The magnetic field guiding device guides the magnetic field with at least three measuring electrodes for tapping a measurement voltage induced in the medium. The control and evaluation unit generates the magnetic field by energizing the coils and evaluates the measurement voltage. The coils are distributed over a circumference of the magnetic field guiding device, which acts a coil core in a region of the coils, so that the coils are arranged with their coil longitudinal axes in the circumferential direction with respect to the measuring tube. Each of the measuring electrodes is arranged between two coils in the radial direction.

Magnetic-inductive flowmeter

An ultrasonic transducer for an ultrasonic flowmeter includes a transducer housing and a transducer element arranged in the transducer housing for generating and/or receiving ultrasonic signals at least in a useful frequency range of the ultrasonic transducer. The transducer housing has an ultrasound window in the region of the transducer element for transmitting the ultrasound signals between the interior and the exterior of the transducer housing. The transducer housing has a fastening section for fastening the ultrasonic transducer to a measuring tube. The transducer housing extends with a transition section between the ultrasound window and the fastening section. The transition section of the transducer housing has, in an attenuation region, a phononic crystal with an acoustic band gap in the useful frequency range, so that the transmission of ultrasonic signals in the useful frequency range between the ultrasound window and the fastening section is at least attenuated.

Ultrasonic transducer and ultrasonic flowmeter

An ultrasonic flowmeter having a measuring tube, a control unit, at least one first ultrasonic measuring unit and a second ultrasonic measuring unit, the measuring tube having a measuring tube interior and a measuring tube longitudinal axis, wherein each of the ultrasonic measuring units is arranged on the measuring tube, wherein each ultrasonic measuring unit has a first ultrasonic transducer and a second ultrasonic transducer, the first and the second ultrasonic transducers spanning a sound measuring section with a sound axis. The sound measuring section and the sound axis penetrate the measuring tube interior for carrying out ultrasonic measurements. To provide an ultrasonic flowmeter for reliable measurement of a multi-phase medium, the sound axis of the first ultrasonic measuring unit and the sound axis of the second ultrasonic measuring unit span a sound measuring plane which extends substantially parallel to the longitudinal axis of the measuring tube.

Ultrasonic flowmeter, method for operating an ultrasonic flowmeter, measuring system and method for operating a measuring system

A flow sensor for a multi-phase medium flowmeter has a sensor carrier, and the sensor carrier has at least one first sensor array. The at least one first sensor array has a first permittivity sensor for determining a first permittivity of a multi-phase medium, a second permittivity sensor for determining a second permittivity of the medium, a density sensor for determining a density of the medium, and a first sensor axis. The first permittivity sensor, the second permittivity sensor, and the density sensor are arranged on the sensor carrier along the first sensor axis, and the first permittivity sensor and the second permittivity sensor are spaced apart with a permittivity sensor distance.

Flow sensor, method and flowmeter for determining speeds of phases of a multi-phase medium

A measuring device has a flowmeter, an inlet tube and an outlet tube. The flowmeter has a measuring tube that is connected to the inlet tube and to the outlet tube. To provide a measuring device that allows for measurements using a flowmeter, in particular of the liquid components of medium in the measuring tube, independent of whether the medium is made to flow or is stagnant, wherein the measuring tube is completely filled at least with the liquid components of the medium when the medium is stagnant the inlet tube, the measuring tube and the outlet tube form a siphon, wherein the siphon is designed and aligned in respect to the vector of the gravitational field of the earth so that, when a medium initially flows through the siphon and then the flowing of the medium stops, the measuring tube is completely filled with the stagnant medium.

Measuring device with a flowmeter and method for operating a measuring device

A method for operating a flowmeter for determining the flow of a multiphase medium flowing through a measuring tube using a first and a second measuring device, one of which operates on a tomographic measuring principle and one of which uses a measuring principle based on nuclear magnetic resonance. The first measuring device operates in a different manner from the second measuring device, e.g., using a measuring device operating on the measuring principle of pre-magnetization contrast measurement and having a pre-magnetization section with a constant magnetic field. The magnetic field has at least one component perpendicular to the direction of flow of the multi-phase medium and is generated by using magnetic field generating elements, which are arranged around the measuring tube. Additionally, an assembly for exciting nuclear spin by a RF excitation pulse or a RF excitation pulse sequence is part of the measuring device.

Flowmeter with a measuring device implementing a tomographic measuring principle

A method for operating a nuclear-magnetic flowmeter in which, when determining a velocity of the medium through a measuring tube, the dependency on properties or the state of a medium is at least reduced. The method exciting a first volume of the magnetized medium flowing at a first velocity within a first measuring section to nuclear-magnetic resonances and a first signal sequence is formed characterizing the nuclear-magnetic resonances of the medium in the first volume, and then, exciting a second volume of the magnetized medium flowing at a second velocity within the first measuring section is excited to nuclear-magnetic resonances and a second signal sequence is formed characterizing the nuclear-magnetic resonances of the medium in the second volume. A quotient sequence is determined from each of the first and second signal sequences, and the first velocity and/or the second velocity is/are determined using the quotient sequence.

Method for operating a nuclear-magnetic flowmeter and nuclear magnetic flowmeter

A method for operating a nuclear magnetic flowmeter for determining the flow of a slug flow medium flowing through a measuring tube, with which 'tuning' parameters and 'matching' parameters are set for a slug zone a film zone, reflected power is measured over time. If the reflected power in a system set for slug zone is low for the slug zone and high for the film zone and if the reflected power in a system set for film zone is low for the film zone and high for the slug zone, relative dwell time of the slug zone and the film zone in the RF coil and the relative frequency of the slug zones and film zones in the flowing medium are determined using the reflected power with a jump in the value of the reflected power from a high value to a lower value used to trigger measurement initiation.

Method for operating a nuclear magnetic flowmeter

A method for measuring the flow rate of a multi-phase medium flowing through a measuring tube using a nuclear magnetic resonance flow meter can be used to measure the flow rate of a multi-phase medium in a simplified manner. For this purpose, a measuring device is used which implements, at the end of each pre-magnetization path, 2D tomography in the measurement tube cross-sectional plane with stratification in the z direction; the measurement tube cross-sectional plane is subdivided into layers that are thin compared to the measurement tube diameter; nuclear magnetic resonance measurements are carried out in every layer to determine measurement signals, using pre-magnetization paths of different lengths; the flow rates are measured in every layer based on the measurement signals; and the time is determined from the signal ratios of the amplitudes of the measurement signals in every layer.

Method for operating a nuclear magnetic flowmeter and nuclear magnetic flowmeter

A nuclear magnetic flowmeter () for determining the flow of a medium flowing through a measuring tube () having a magnetic field generator (), a measuring unit () and an antennae unit () with an antenna (). wherein the antennae unit () has at least one further antenna (), that is designed as a coil and is designed for transmitting the excitation signal to the magnetized medium () and for detecting the measuring signal over a further measuring section () aligned parallel to the longitudinal axis () of the measuring tube and located in the magnetic field path (), and the measuring section () and the further measuring section () are different.

Nuclear magnetic flowmeter and method for operating nuclear magnetic flowmeters

A flowmeter for determining the flow of a multi-phase medium through a measuring tube has a first and a second measuring device, one of which operates on a tomographic measuring principle and one of uses a measuring principle based on nuclear magnetic resonance. The first measuring device operates in a different manner from the second measuring device, e.g., using a measuring device operating on the measuring principle of pre-magnetization contrast measurement and having a pre-magnetization section with a constant magnetic field. The magnetic field has at least one component perpendicular to the direction of flow of the multi-phase medium and is generated by using magnetic field generating elements, which are arranged around the measuring tube. Additionally, an assembly for exciting nuclear spin by a RF excitation pulse or a RF excitation pulse sequence is part of the measuring device.

A method for operating a nuclear magnetic flowmeter having a measuring device for determining the flow of the medium through the measuring tube, the measuring device having a magnetic field generator for generating a magnetic field permeating the medium and the measuring tube and for carrying out nuclear magnetic measurements of measuring volumes that are adjustable in position and size in the magnetic field. The nuclear magnetic measurements involve adjusting the size of the measuring volume, positioning the measuring volume, generating excitation signals for exciting the medium, transmitting excitation signals into the measuring volume and measuring echo signals caused by the excitation signals. Deposits on the inner wall of the measuring tube are determined from echo signals of all nuclear magnetic measurements assigned to the position of the measuring volume of the respective nuclear magnetic measurement and at least one abrupt change in the echo signals detected.

A nuclear magnetic flowmeter () for determining the flow of a medium flowing through a measuring tube (), having a magnetic field generator () having permanent magnets for generating a magnetic field interfusing the medium over a magnetic field section L, having a pre-magnetization section Llocated within the magnetic field section Land having a measuring device also located in the magnetic field section Lincluding a coil-shaped antenna () with the length Lserving as a measuring antenna. At least one coil-shaped antenna () is provided in the pre-magnetization section Lfor generating a pulse or pulse sequence spoiling the magnetization of the medium in the direction of the magnetic field.

Nuclear magnetic flowmeter and method for operating a nuclear magnetic flowmeter

A magnetization device with a magnetic field which is generated by permanent magnets for variable magnetization of a medium flowing through a tube over a magnetization distance along the longitudinal axis of the tube. The magnetization device improves the quality of the results relative to known nuclear magnetic resonance measurement and analysis methods in that the magnetic field in the medium has a single direction over the magnetization distance.

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Spijk, Netherlands

Cornelis Johannes Hogendoorn