Vibronic measuring system for measuring mass flow rate

Abstract

The invention relates to a measuring system comprising a measuring and operation electronic unit (ME) and a transducer device electrically coupled thereto. The transducer device (MW) has at least onetube, through which fluid flows during operation and which is caused to vibrate meanwhile, a vibration exciter (41), two vibration sensors (51, 52), on the inlet and outlet sides, respectively, for generating vibration signals (s1, s2), and two temperature sensors (71, 72), on the inlet and outlet sides, respectively, for generating temperature measurement signals (theta1, theta2), said temperature sensors being coupled to a wall of the tube in a thermally conductive manner. The measuring and operation electronic unit (ME) is electrically connected to each of the vibration sensors (51, 52) andto each of the temperature sensors (71, 72) and also to the at least one vibration exciter (41). The measuring and operation electronic unit (ME) is designed to feed electrical power into the at least one vibration exciter (41) in order to effect mechanical vibrations of the tube (11) by means an electrical excitation signal (e1). Furthermore, the measuring and operation electronic unit (ME) is designed to generate a mass flow sequence (Xm), namely a series of temporally successive mass flow measurement values (xm,i) representing the instantaneous mass flow rate (m) of the fluid, by means ofeach of the vibration signals (s1, s2) and each of the temperature measurement signals (theta1, theta2) in such a way that, at least for a reference mass flow rate (mref), namely a specified mass flowrate of a reference fluid flowing through the transducer device, the mass flow measurement values (xm,i - xm,ref) are independent of the temperature difference (delta(theta)).

Description

technical field [0001] The invention relates to an electro-vibratory measurement system, in particular for measuring physical measurement variables of fluids flowing in pipelines. Background technique [0002] In industrial measurement and automation technology, electro-vibration measuring systems - i.e. measuring systems formed by means of electro-vibration transducer devices - are frequently used for the highly accurate determination of the measurement of at least one physically measured variable of a fluid flowing in a pipeline value, the at least one physically measured variable is eg a material parameter such as density and / or a flow parameter such as mass flow rate of a gas, liquid or dispersion. In particular, an electro-vibration measurement system is established in this aspect, wherein the transducer device comprises at least one tube comprising an inner cavity surrounded by a generally metallic wall, wherein an inlet-side first end extends to an outlet Said tube a...

AI Technical Summary

Problems solved by technology

For this reason, the measurement system has additional but expensive valve controls and additional supply and return fluid lines

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