Abb Patent Gmbh

Abb Ag

Lothar Deppe

Frank Kassubek

Steffen Keller

Jörg Gebhardt

René Friedrichs

Rene Friedrichs

Joerg Gebhardt

Wolfgang Waldi

Robert Huber

Rolf Disselnkötter

Armin Gasch

Kuno Hug

Beat Kramer

Jorg Herwig

Reinhard Steinberg

Satish Gunturi

Guenter Petri

Matthias Dettmer

Steffen Dr-Ing Keller

Rene Dipl-Phys Friedrichs

Jörg Dipl-Ing Herwig

Jörg Dr-Ing Gebhardt

Wolfgang Dipl-Ing Waldi

The disclosure relates to a Coriolis mass flowmeter with an oscillatable straight measuring tube consisting of a corrosion-resistant metal, in particular of titanium or a titanium alloy, to which are attached mounted parts connected directly to the measuring tube for the implementation of the Coriolis measurement principle. Furthermore, stabilizing elements running parallel to the measuring tube are coupled to the measuring tube via mounted parts connected directly to the measuring tube, the mounted parts and the stabilizing elements consisting of a metal other than that of the measuring tube. The stabilizing elements are manufactured from a second material which possesses a coefficient of thermal expansion adapted to the metal of the measuring tube. The mounted parts connected directly to the measuring tube are manufactured from a third material which possesses a higher coefficient of thermal expansion than the metal of the measuring tube.

Coriolis mass flowmeter with an oscillatable straight measuring tube

A measuring instrument to capture a physical/chemical measured value, including a sensor unit, which is linked via a contactless interface to a transmitter unit, for passing on to a central analysis unit, wherein the sensor unit includes an at least partly internal sensor element which vibrates against a sensor housing because of operation, and which is linked, contactlessly and inside the sensor unit, for sensor signal transmission, via a first transmission/reception unit, to a complementary second transmission/reception unit, which is arranged at a fixed location relative to the sensor housing, and which is also linked, contactlessly and outside the sensor unit, to a third transmission/reception unit of the transmitter unit.

Measuring instrument to capture a physical/chemical measured value

A method is disclosed for producing a connection between a measuring tube and at least one flange, e.g., in the case of a Coriolis mass flowmeter. In order to ensure reliable connection of the components in this case, the measuring tube can be inserted at one end over a portion through a flange bore, such that it projects out of the bore on the other side, and that the projecting end be flared out over the sealing face of the flange.

Method of producing a connection between a measuring tube and at least one flange

A method for compensation for influences, which interfere with the measurement accuracy, in measurement devices of the vibration type, comprising a measurement tube through which a fluid medium can flow and which is caused to oscillate mechanically, acting as an oscillation body, by an excitation unit, whose oscillation behavior, which changes as a function of the flowrate and/or the viscosity and/or the density of the fluid medium, is detected by at least one oscillation sensor in order to determine the flowrate, wherein the material strain in the measurement tube is detected by means of at least one sensor, from which an indicator value for the influence causing the material strain is calculated in order to correct the measurement signal, by signal processing, from the indicator value obtained in this way.

Method and device for compensation for influences, which interfere with the measurement accuracy, in measurement devices of the vibration type

A process is disclosed for operating a measurement device of the vibration type in which at least one exciter arrangement excites the system to vibration and from the vibration parameters, a measurement quantity of a measurement medium in a tube system is determined. A time-dependent force f(t)=F sin(&#x3c9;t)+g(t) with at least one sinusoidal component with an adjustable frequency &#x3c9; can be used which acts on at least one vibration-capable part of the measurement device of the vibration type. A response signal of the vibration-capable part, (e.g., its time dependent velocity v(t)=V sin(&#x3c9;t+&#x3c8;)+h(t)) can be measured, and a phase shift &#x3a8; between the response signal and the force f of a signal component which oscillates with a frequency &#x3c9; is determined. The phase shift &#x3a8; can be used as the input for a frequency controller so that the excitation frequency is automatically adjusted as a function of &#x3a8;.

Process for operating a measurement device of the vibration type

The disclosure relates to a vibration-type measuring device for measuring at least one process variable, in particular a mass flow rate, a density, a viscosity, a pressure or the like, in particular in a process line through which a medium can flow, which device comprises at least one measurement sensor which provides a measurement signal that can be influenced by the process variable, the measured value determined for the process variable by the measuring device being able to be determined from a functional relationship in conjunction with measurement parameters from the measurement signal, and the measurement parameters having a temperature-dependent cross-sensitivity with respect to the temperature distribution in the measuring device. The measuring device comprises at least one temperature sensor, by means of which the local temperature can be measured, and a temperature distribution field can then be calculated with electronic means using a temperature distribution theorem, and correction values for compensating for the temperature-dependent cross-sensitivities of the measurement parameters can be determined from the temperature field data.

Vibration-type measuring device and method for operating such a measuring device

The invention concerns a Coriolis mass flowmeter comprising at least one conduit () traversed by the mass, which produces mechanical vibrations under the effect of an excitation unit () and acts as an oscillating element, whereof the oscillating behaviour which varies based on the mass flow rate is sensed by at least one sensor () to determine the mass flow. The invention aims at determining the degree of wear of the conduit (). Therefor, the excitation unit () applies a single excitation pulse to the conduit (), whereof the oscillatory response is sensed by the sensor (). The invention is characterized in that an evaluating unit () arranged downstream calculates the initial dampening constant recorded when the conduit () was new.

Coriolis mass flowmeter determining state of wear of the pipe

Coriolis mass flowmeter with a measuring pipe () vibrating in coupled flexural and torsional modes, characterized in that an attachment () which is formed rotationally symmetrically with respect to an axis of rotational symmetry and can be made to undergo torsional oscillations of the same frequency, but opposite phase, in relation to the torsional oscillating modes of the measuring pipe () is mechanically connected to the measuring pipe () and the axis of rotational symmetry of the attachment runs parallel to the straight line () (central axis) defined by the center points () of the cross-sectional areas () of the inlet and outlet of the measured section or coincides with this line.

Coriolis mass flowmeter

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Göttingen, Germany

Lothar Deppe