On-line flow meter

Abstract

The inventive in-line-measuring device comprises a vibratory-type measuring sensor provided with at least one measuring tube through which a measurable medium passes during the device operation. Said measuring tube is displaceable by means of an exciter arrangement at least temporarily and / or at least in a parallel direction according to lateral oscillations and at least temporarily and / or at least in a parallel direction according to torsion oscillations around the longitudinal imaginary axis of the measuring tube alternating with lateral oscillations or temporary superimposed therewith. In addition, the in-line-measuring device comprises a sensor arrangement for producing the measuring tube oscillations corresponding to representative oscillation measurements. An electronic unit of the measuring device, which controls the exciter arrangement, generates, by means of the oscillation measuring signal an / or an excitation current at least temporary at least one measuring value representing at least one measurable physical measuring quantity, par example mass flow rate-mass flow rate, a medium density or viscosity. Said electronic unit of the measuring device also makes it possible to determine a first intermediate value which corresponds to the lateral current fraction of the excitation current for maintaining the lateral oscillations of the measuring tube and a second intermediate value corresponding to the torsion current value of the excitation current for maintaining the torsion oscillations of the measuring tube and / or to a torsion oscillation damping of the measuring tube. A high-accuracy value is determined taking into account said two intermediate values and is valid event for two- or more-phased media.

Description

technical field [0001] The invention relates to an on-line measuring instrument with a measuring transducer of the vibrating type, in particular a Coriolis mass flow / density measuring instrument for especially two-phase or multiphase media flowing in pipelines, the invention also relates to A method for generating measured values ​​with such a measuring transducer, which represent a physically measured variable of a medium, for example the mass flow, density and / or viscosity of the medium. Background technique [0002] In process measurement and automation technology, in order to measure the physical parameters of the medium flowing in the pipeline, such as mass flow, density and / or viscosity, such online measuring instruments, especially Coriolis mass flow measuring instruments, are often used. Vibration-type measuring transducers in a medium-conducting pipe through which the medium flows during operation and the measuring and operating circuits connected to it generate r...

AI Technical Summary

Problems solved by technology

However, this is a very special solution which can only be realized in very limited cases, especially in measurement technology in industrial processes

On the one hand, in this case the pipe into which the measuring transmitter is to be installed may have to be fixed to the transmitter and not vice versa, which means additional costs for the user in creating the measuring position

On the other hand, as already mentioned, the measuring tube may be bent, so that the problem cannot be solved by changing the orientation of the installation

In this regard, it has been found that the mentioned deterioration of the measurement signal is practically not significantly avoided by using vertically mounted straight measuring tubes

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