Abstract: A thermal, flow measuring device and method for measuring the flow of a measured medium. During a heating phase of predetermined length a constant heating current of a first electrical current source flows through a first resistor. During a first measuring phase of predetermined length a constant measurement current of a second electrical current source flows through the first resistor. During the first measuring phase a first voltage falls across the first resistor, wherein during a second measuring phase of predetermined length during the first measuring cycle the constant measurement current of the second electrical current source flows through a second resistor.
Abstract: An ultrasonic, flow measuring device, comprising an ultrasonic transducer in a bore of a measuring tube, which ultrasonic transducer has an ultrasound window, wherein a guide vane is inserted into the bore of the measuring tube in front of the ultrasound window and perpendicular to the ultrasound window of the ultrasonic transducer.
Abstract: A method for determining mass flow of a two-phase medium flowing through a measuring tube of a vortex, flow measuring device. The measuring tube has in a measuring cross section at least one bluff body for producing vortices. By sensor registering of the produced vortices, a flow velocity of the medium in the region of the measuring cross section is determined. In the method, the density of the medium in the region of the measuring cross section is determined from the specific, total enthalpy of the medium in the region of the measuring cross section, from the flow velocity of the medium in the region of the measuring cross section, from a static pressure of the medium in the region of the measuring cross section and from the static temperature of the medium in the region of the measuring cross section. Additionally, the mass flow is determined from the determined flow velocity, the determined density and a flow cross section of the medium in the region of the measuring cross section.
Abstract: A measurement transducer of a thermal mass flow meter for determining the flow rate of a medium that flows through a pipe, which comprises at least one thin film resistance thermometer, which is arranged in a sheath, wherein the sheath comprises a first open end, out of which at least one cable for electrical contact with the resistance thermometer is led out of the sheath, wherein the cable in the sheath is embedded in a first fill material, at least in sections, and wherein the thin film resistance thermometer is at least partially covered by a second fill material, which is a gaseous, liquid, semi-liquid, powder or solid and in the case cited last, comprises a hardness of at most Shore A 90, and that the first fill material comprises a hardness of at most Shore D 98.
Type:
Application
Filed:
June 20, 2011
Publication date:
October 17, 2013
Applicant:
Endress + Hauser Flowtec AG
Inventors:
Tobias Baur, Fanos Christodoulou, Axel Pfau, Martin Barth, Arno Lang
Abstract: Flow measuring device for ascertaining flow of a measured medium flowing through a measuring tube, which flow measuring device has a first housing for protruding into the measured medium, wherein the first housing has a first surface intended to face the measured medium, wherein the flow measuring device includes a second surface for bounding the measured medium, and wherein each separation between the first surface for bounding the first housing from measured medium, the second surface for bounding the measured medium and the first surface of the first housing amounts to at least 1 mm.
Abstract: A measuring transducer of vibration type, especially a Coriolis mass flow meter, having a housing and a mass flow tube, wherein the mass flow tube is formed into a helix having a first loop and a second loop; wherein the mass flow tube has a securement element which affixes a peripheral point of the first loop relative to a neighboring peripheral point of the second loop; and wherein the mass flow tube has an oscillation exciter on a side lying opposite the securement element along the mass flow tube. The mass flow tube has provided between the oscillation exciter and the securement element at least one add-on part acting as a canceling mass.
Type:
Grant
Filed:
October 22, 2010
Date of Patent:
October 15, 2013
Assignee:
Endress + Hauser Flowtec AG
Inventors:
Ennio Bitto, Wolfgang Drahm, Gerhard Eckert, Dieter Mundschin
Abstract: A coupling element of a sensor of an ultrasonic, flow measuring device, which includes at least three rods having, in each case, a first rod end and a second rod end. The rods, in each case, have, on their respective first ends, first end faces, which, in each case, can be acoustically coupled with the sound-emitting and/or sound-receiving area of an ultrasonic transducer element. The respective first end faces of the rods together form a first coupling surface of the coupling element, and the rods, in each case, have, on their respective second ends, second end faces, which form a second coupling surface of the coupling element, wherein the rods, in each case, have a first rod cross section, which is different in shape and/or size from a respective second rod cross section.
Type:
Grant
Filed:
November 19, 2010
Date of Patent:
October 15, 2013
Assignee:
Endress + Hauser Flowtec AG
Inventors:
Andreas Berger, Frank Wandeler, Achim Wiest
Abstract: A coupling element of an ultrasonic transducer suitable for mode conversion of an acoustic longitudinal wave between an in-coupling surface and an out-coupling surface of the coupling element. The coupling element has a first and second interface with a predetermined medium. A first angle between the in-coupling surface and the first interface and a second angle between the first interface and the out-coupling surface are so selected that a transverse waves fraction is reflected on the first interface to the out-coupling surface. The first angle between the in-coupling surface and the first interface and a third angle between the first interface and the second interface are so selected that a longitudinal wave fraction is reflected on the first interface for second interface. A fraction of the longitudinal waves reflected to the second interface is reflected on the second interface back into the coupling element.
Abstract: An ultrasonic transducer for an ultrasonic, flow measuring device comprising an electromechanical transducer element and an ultrasound window, wherein an adapting, or matching, layer liquid at operating conditions of the ultrasonic transducer is arranged between the electromechanical transducer element and the ultrasound window, wherein the ultrasonic transducer has holding means, which exert a releasable force toward the ultrasound window on the electromechanical transducer element, in order to hold the electromechanical transducer element in a predetermined position relative to the ultrasound window.
Type:
Grant
Filed:
December 19, 2011
Date of Patent:
October 1, 2013
Assignee:
Endress + Hauser Flowtec AG
Inventors:
Pierre Ueberschlag, Michal Bezdek, Andreas Berger
Abstract: Thermal flow measuring device and method for the manufacture of a thermal flow measuring device with a spacer having a first cavity for accommodating a resistance thermometer, wherein the spacer has at least a first planar area, which faces the first cavity, and a second cavity, through which the resistance thermometer can be pressed by means of a hold-down onto the first planar area of the spacer.
Abstract: A driver circuit having: a voltage controller (UCD), which delivers a direct voltage (UPD) to a controller output; a direct voltage converter (DC/DC), to which is applied on the primary side the direct voltage (UPD) delivered from the voltage controller, and which converts such into a direct voltage (U?PD) available on the secondary side; and an end stage operated by means of said direct voltage (U?PD), which converts a control signal (sinexc—A) lying on a signal input into a driver signal (iexc) for the measuring transducer. The direct voltage (U?PD) available on the secondary side of the direct voltage converter (DC/DC) has, in such case, a magnitude which is always smaller than a magnitude of the direct voltage (UPD) delivered by the voltage controller, and the driver signal (iexc) has an electrical power (Pexc), which is higher than an electrical power (Psin) of the control signal (sinexc—A).
Abstract: A method for determining tube wall thickness of at least one measuring tube of a Coriolis, flow measuring device, wherein the Coriolis, flow measuring device has an oscillatory system, which includes at least one measuring tube, and at least one exciter, by which the oscillatory system is excitable to execute mechanical oscillations. In the method, at least one excitation input variable of the at least one exciter and at least one response variable of oscillations of the oscillatory system caused thereby are registered. Additionally, a tube wall thickness of the at least one measuring tube is ascertained by inserting the excitation input variable and the response variable into a transfer equation.
Type:
Grant
Filed:
May 5, 2010
Date of Patent:
August 20, 2013
Assignee:
Endress + Hauser Flowtec AG
Inventors:
Alfred Rieder, Wolfgang Drahm, Hao Zhu, Marcel Braun
Abstract: An ultrasonic transducer for an ultrasonic flow measuring device, comprising an electromechanical transducer element, which is prestressed against an ultrasonic window of the ultrasonic transducer by a suitable structure, wherein a first surface of the electromechanical transducer element faces the ultrasonic window, and wherein a second surface of the electromechanical transducer element lying opposite the first surface is divided into a plurality of segments, which are galvanically connected with the suitable structure for prestressing.
Abstract: An ultrasonic transducer for an ultrasonic flow measuring device, comprising a first housing part having an ultrasonic window and adjoining, rotationally symmetric walls, wherein there adjoins on the walls of the first housing part, coaxially with the walls of the first housing part, a first ring as resonator, which forms an end of the first housing part.
Abstract: A measuring arrangement of the invention includes: At least one measuring device, which generates, repeatedly during operation, measured values, especially digital, measured values, representing the at least one measured variable to be registered; as well as an electronic data processing system superordinated to the at least one measuring device, especially a data processing system which is spatially distributed and/or spatially remote from the measuring device. Measuring device and data processing system are connected together by means of at least two line-pairs, through each of which an electrical current flows, at least at times, during operation. According to the invention, the measuring device transmits the internally generated, measured values to the data processing system via both line-pairs. In this way, it is then possible to transmit a plurality of measured values simultaneously, when each of the two line-pairs is embodied as part of a two-conductor current-loop.
Abstract: A measuring tube, a measuring system and a method for determining and/or monitoring flow through a measuring tube, comprising a measuring tube, on which ultrasonic transducers are releasably placeable. The ultrasonic transducers transmit and/or receive ultrasonic signals, which pass through the measuring tube approximately coaxially to the measuring tube axis.
Type:
Grant
Filed:
December 11, 2009
Date of Patent:
July 23, 2013
Assignee:
Endress + Hauser Flowtec AG
Inventors:
Achim Wiest, Vivek Kumar, Michal Bezdek, Pierre Ueberschlag
Abstract: An ultrasonic transducer for an ultrasonic flow measuring device, comprising a first housing part and a second housing part. The second housing part is axially guided in the first housing part and is so biased relative to the first housing part that, in a first state of the ultrasonic transducer, a first axial stop of the second housing part rests on a first axial stop of the first housing part, wherein, by applying, counter to the bias, a predetermined force on a second axial stop of the second housing part, the second housing part is axially shiftable, so that, in a second state of the ultrasonic transducer, the first axial stop of the second housing part is moved out of the first state.
Abstract: A method for monitoring oscillation characteristics in a Coriolis, flow measuring device and to a correspondingly formed, Coriolis, flow measuring device in the case of which an excited oscillatory system is simulated with a digital model, which has at least one fittable parameter. The simulating includes, in such case, excitating the digital model in the same manner as the oscillatory system, calculating a simulation response variable of the simulated oscillations according to the digital model, and, performed over a plurality of signal modulations, iterative conforming of the at least one, fittable parameter in such a manner that the simulation response variable interatively approaches the response variable. Furthermore, it is ascertained whether a corresponding limit value is exceeded by the at least one, interatively ascertained parameter value for the at least one, fittable parameter or by at least one variable derived from the at least one, iteratively ascertained parameter value.
Abstract: A measuring system for determining and/or monitoring flow of a measured medium through a measuring tube, including: at least one ultrasonic transducer; and at least one control/evaluation unit, which, on the basis of measurement signals or on the basis of measurement data derived from the measurement signals, ascertains volume- and/or mass-flow of the medium flowing in the measuring tube; wherein the ultrasonic transducer has at least one electromechanical transducer element, which sends and/or receives ultrasonic signals; and at least one coupling layer in the region between electromechanical transducer element and measured medium, which coupling layer conducts the ultrasonic signals, and which ultrasonic transducer is acoustically coupleable with the measuring tube and at least partially fittable on the outer shape of the measuring tube and which electromechanical transducer element is flexible.