Endress + Hauser Flowtec Ag

Michael Wiesmann

Alfred Rieder

Hao Zhu

Michael Fuchs

Wolfgang Drahm

Leonhard Probst

Ennio Bitto

Christof Huber

Gerhard Eckert

Martin Josef Anklin

Rainer Lorenz

Christian Schütze

Patrick Oudoire

Yaoying Lin

Josef Hubensteiner

Yaoing Lin

Enio Bitto

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.

Measuring device for determining the density, the mass flow and/or the viscosity of a gas-charged liquid, processing system having such a measuring device, and method for monitoring a gas-charged liquid

A measuring system comprises: a measuring transducer; transmitter electronics; at least one measuring tube; and at least one oscillation exciter. The transmitter electronics delivers a driver signal for the at least one oscillation exciter, and for feeding electrical, excitation power into the at least one oscillation exciter. The driver signal, has a sinusoidal signal component which corresponds to an instantaneous eigenfrequency, and in which the at least one measuring tube can execute, or executes, eigenoscillations about a resting position. The eigenoscillations have an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode. The driver signal has, a sinusoidal signal component with a signal frequency, which deviates from each instantaneous eigenfrequency of each natural mode of oscillation of the at least one measuring tube, in each case, by more than 1 Hz and/or by more than 1% of said eigenfrequency.

Measuring system having a measuring transducer of vibration-type

transducer apparatus comprises a transducer housing, a tube, a temperature sensor as well as a temperature sensor. The tube is arranged within a cavity of the transducer housing, in such a manner that an intermediate space is formed between a wall of the transducer housing facing the cavity inner surface and an outer surface of a wall of the tube facing the cavity. Furthermore, the tube is adapted to guide a fluid in its lumen, in such a manner that an inner surface of the wall of the tube facing the lumen is contacted by fluid guided in the lumen. Each of the temperature sensors is formed by means of a temperature detector arranged within the intermediate space as well as by means of a coupling body coupling the respective temperature detector thermally conductively with the wall of the tube and is additionally adapted to register a particular measurement location temperature, and to transduce such into a corresponding temperature measurement signal, namely an electrical measurement signal representing the particular measurement location temperature.

Transducer apparatus as well as measuring system formed therewith

A transducer apparatus comprises a transducer housing, a tube as well as a temperature sensor. The tube is arranged within a cavity of the transducer housing, in such a manner that an intermediate space is formed between a wall of the transducer housing facing the cavity inner surface and an outer surface of a wall of the tube facing the cavity. The tube is adapted to guide a fluid in its lumen, in such a manner that an inner surface of the wall of the tube facing the lumen is contacted by fluid guided in the lumen. The temperature sensor is formed by means of two temperature detectors arranged within the intermediate space as well as by means of a coupling body coupling the temperature detector thermally conductively with the wall of the tube as well as by means of a coupling body coupling the temperature detector thermally conductively with the temperature detector and is additionally adapted to register a particular measurement location temperature, namely a temperature at a first, respectively second, temperature measurement location formed by means of the respective temperature detector, and to transduce such into a corresponding temperature measurement signal, namely an electrical measurement signal representing the particular measurement location temperature.

A measuring transducer comprises a housing, and a tube arrangement formed by means of at least two tubes extending within the housing. At least one tube is embodied as a measuring tube serving for conveying flowing medium and another tube is mechanically connected with the tube by means of a coupling element to form an inlet-side coupling zone and by means of a coupling element. The coupling element is arranged equally far removed from the housing end. One coupling element has, about an imaginary longitudinal axis of the tube arrangement imaginarily connecting a center of mass of the coupling element and a center of mass of the other coupling element, with an angle of intersection equal to that with the other coupling element, a bending stiffness, which deviates from a bending stiffness of the other coupling element about said imaginary longitudinal axis of the tube arrangement.

Measuring transducer of vibration-type as well as method for its manufacture

Measuring transducer of vibration-type for a fluid flowing in a pipeline. The measuring transducer includes, in such case, a curved measuring tube for conveying the fluid, a counteroscillator having two counteroscillator arms, which are arranged on both sides of the measuring tube, and which, in each case, essentially follow the curve of the measuring tube, and which are coupled to one another in such a manner, that, during operation, they oscillate in phase with one another, and which are affixed to the measuring tube on the inlet side and outlet sides for forming corresponding coupling zones. The measuring transducer also includes an exciter mechanism, via which, during operation, the measuring tube and the counteroscillator are excitable to oscillations of opposite phase to one another. In such case, the counteroscillator arms are formed from a different material than the measuring tube, and the material of the counteroscillator arms has a thermal expansion coefficient essentially equal to that of the material of the measuring tube.

Measuring transducer of vibration-type with two counteroscillator arms

The measuring transducer includes: a measuring tube vibrating, at least at times, and serving for conveying medium to be measured; a counteroscillator, which is affixed to the measuring tube on an inlet-side, to form a first coupling zone, and to the measuring tube on an outlet-side, to form a second coupling zone; at least one oscillation exciter for driving at least the measuring tube; as well as at least one oscillation sensor for registering oscillations at least of the measuring tube. During operation, the measuring tube executes, at least at times and/or at least in part, bending oscillations about an imaginary bending oscillation axis, which imaginarily connects the two coupling zones with one another. The oscillation sensor includes a coil, especially a coil affixed to the counteroscillator, as well as, magnetically coupled with the coil, a permanent magnet, which is placed within a magnet cup composed at least partially of magnetically conductive material and which is held to a cup base, especially a cup base secured to the measuring tube. Additionally, it is provided in the measuring transducer of the invention that a cup wall of the magnet cup, especially an essentially circular-cylindrical and/or tubular, cup wall, especially a cup wall extending essentially in the direction of the counteroscillator, has at least one slit, especially a slit extending at least sectionally in the direction of oscillations of the measuring tube relative to the counteroscillator.

Measuring transducer of vibration-type

The measuring transducer includes: a measuring tube vibrating, at least at times, during operation and serving for conveying a medium, wherein the measuring tube communicates with a pipeline via an inlet tube piece at an inlet end and an outlet tube piece at an outlet end; a counteroscillator, which is affixed to the measuring tube on the inlet end to form a first coupling zone and affixed to the measuring tube on the outlet end to form a second coupling zone; a sensor arrangement secured, at least in part, to the counteroscillator for registering oscillations at least of the measuring tube; an exciter mechanism secured, at least in part, to the counteroscillator for driving at least the measuring tube; a transducer housing affixed to the inlet tube piece and the outlet tube piece; and connection lines, especially connection lines for the exciter mechanism and/or for the sensor arrangement, of which connection lines at least one is secured at least sectionally along the counteroscillator and secured at least pointwise thereto, as well as to the transducer housing. The connection lines are routed essentially symmetrically with respect to a principal axis of inertia of the inner part formed by means of measuring tube and counteroscillator, especially mirror-symmetrically with respect to at least one principal axis of inertia of the counteroscillator, whereby an essentially symmetrical damping force per unit length can be assured in the measuring transducer.

Vibration-type measuring transducer having connecting lines secured pointwise to the transducer housing

A measuring transducer includes: A measuring tube vibrating, at least at times, during operation and serving for conveying a medium, wherein the measuring tube communicates with a pipeline via an inlet tube piece at an inlet end and an outlet tube piece at an outlet end; a counteroscillator, which is affixed to the measuring tube on the inlet end to form a first coupling zone and affixed to the measuring tube on the outlet end to form a second coupling zone; and a transducer housing affixed to the inlet tube piece and the outlet tube piece. An exciter mechanism, for driving at least the measuring tube, and a sensor arrangement, for registering oscillations at least of the measuring tube, are, in each case, secured, at least in part, to the counteroscillator. Additionally, on the inlet side, an cantilever is so coupled in the region of the coupling zone with the inlet tube piece and the measuring tube, that the center of mass of the cantilever lies in the region of the inlet tube piece, and, on the outlet side, an cantilever is so coupled in the region of the coupling zone with the outlet tube piece and the measuring tube, that the center of mass of the cantilever lies in the region of the outlet tube piece. Furthermore, the measuring transducer includes connection lines, especially connection lines for the exciter mechanism and/or for the sensor arrangement, with at least one of the connection lines being secured to at least one of the two cantilevers.

Measuring transducer of the vibration-type with two cantilevers

A measuring transducer includes: a measuring tube vibrating, at least at times, during operation and serving for conveying a medium, wherein the measuring tube communicates with a pipeline via an inlet tube piece on an inlet side and an outlet tube piece on an outlet side; a counteroscillator, which is affixed to the measuring tube on the inlet and outlet sides to form coupling zones; an cantilever coupled with the measuring tube on the inlet side; an cantilever coupled with the measuring tube on the outlet side; a sensor arrangement secured, at least in part, to the counteroscillator for registering oscillations at least of the measuring tube; an exciter mechanism secured, at least in part, to the counteroscillator for driving at least the measuring tube; a transducer housing affixed to the inlet tube piece and to the outlet tube piece; as well as connection lines, of which at least one is secured at least pointwise to the transducer housing and at least pointwise to an inner part of the measuring transducer formed by means of measuring tube, counteroscillator and the two cantilevers. A section at least of the one connection line extends freely suspended between two mutually spaced tie-down points. One of the tie-down points is located on the inner part of the measuring transducer and the other on the transducer housing. The two tie-down points are so placed that a relative distance therebetween remains essentially unchanged, even when the measuring tube is vibrating.

Growing community of inventors

Freising, Germany

Michael Wiesmann