Abb Patent Gmbh

Rene Friedrichs

Frank Kassubek

Steffen Keller

Lothar Deppe

Joerg Gebhardt

Kuno Hug

Wolfgang Waldi

Jorg Herwig

Armin Gasch

Frank Buhl

Ralf Lesjak

Axel Rossberg

Jens Timmer

Guenter Petri

Kilian Bartholome

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

A measuring instrument whose measuring principle is based on an oscillator, for example an eddy counter, and in which there is arranged a sensor for recording a measured signal (S(t)), which can be supplied to an evaluation unit (), characterized in that, from the phase increments psi(tau,t), that is to say from the differences between the instantaneous values phi(t) of the phase signal derived from the measured signal S(t) in a phase extractor () and values phi(t-tau) time-delayed by a delayed time tau, a coupling indicator value (KI) is formed in such a way that the existence of phase coupling with a further oscillator can be detected on the latter by means of comparison with a coupling reference value (KR).

Measuring instrument and method of measuring flows

A device and a method for operating a Coriolis mass flowmeter with at least one measuring pipe, wherein at least two operative assemblies, which can respectively be operated as an exciter (actuator) and/or as a measuring signal pickup (sensor), are attached to the measuring pipe. The operative assemblies are formed as plunger-type armature sensors with a magnetic core. Each operative assembly is operated either as a sensor or as an actuator or simultaneously as an actuator and as a sensor. Each operative assembly is switched over between the operating mode as a sensor and as an actuator by a switch assigned to it.

Device and method for operating a Coriolis mass flowmeter

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

A description is given of a Coriolis mass flowmeter, with a measuring pipe oscillating in coupled flexural and torsional modes. Mechanically connected to the measuring pipe is an attachment which is formed rotationally symmetrically with respect to an axis of rotational symmetry and can be induced to undergo the torsional oscillations of the measuring pipe. The attachment is a multipart body comprising hollow profile rails and/or beams with a closed hollow cross section. The axis of rotational symmetry of the attachment runs parallel to the straight line () (central axis) defined by the centre points () of the cross-sectional areas () of the inlet and outlet of the measured section, or coincide with this line.

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Ladenburg, Germany

Rene Friedrichs