Vibrating Fluid Flow Measurement System with Temperature Compensation

Abstract

The measuring system comprises a transducer device (MW) comprising two end portions (11a, 12a) extending from the respective inlet side, each having a cavity (11') sheathed by an in particular metallic wall. up to the respective outlet-side end (11b, 12b) of the pipe (11, 12), respectively set up for being passed by the fluid from the respective inlet-side end in the direction of the respective outlet-side end flow and vibrate during this time. An electromechanical excitation assembly formed by means of at least one oscillation exciter (41) is used to excite and maintain a mechanical oscillation of each of the tubes (11, 12) about a respective associated static rest position, and by means of at least one oscillation sensor (51 ) to form a sensor assembly (S) for detecting mechanical oscillations of at least one of the pipes (11, 12). The converter device also has two temperature sensors (71, 72), wherein the temperature sensor (71) is mechanically and thermally coupled to the wall of the pipe (11), or the temperature sensor (72) is coupled to the pipe (12) The wall of the device is coupled mechanically and thermally, and wherein each temperature sensor is set up to detect the temperature of the measurement site (θ1; θ2) and convert it into a temperature measurement signal (θ1; θ2). Furthermore, the temperature sensor (71) is located closer to the end (11a) than to the end (11b), and the temperature sensor (72) is located closer to the end (12b) than to the end (12a). Position more closely. The measurement and operating electronics (ME) of the measuring system, which are electrically coupled to the converter device, are also set up to generate a converter temperature measurement value representing the temperature of the converter device using the temperature measurement signal (Θ1, Θ2) , the temperature of the converter equipment deviates not only from the temperature of the measuring part but also from the temperature of the measuring part, so that the measured value of the converter temperature is greater than the value of the temperature of the measuring part, and smaller than the value of the temperature of the measuring part.

Description

technical field [0001] The invention relates to a vibronisch measuring system, in particular for measuring physical measuring variables of a fluid flowing in a pipeline. Background technique [0002] In industrial measurement and automation technology, in order to determine with high precision material parameters such as density, and / or flow such as mass flow rate, for fluids flowing in pipelines (eg also gases, liquids or dispersions) parameter) measurement value of at least one physical measurement variable, usually using a vibrating measurement system, that is to say by means of a vibrating transducer device. More specifically, a vibrating measuring system is also established here, in which the converter device comprises a first tube with an inner cavity surrounded by a generally metal wall and with a generally metal wall A second tube (typically of the same structure and extending parallel to the first tube) of the wall-coated lumen, wherein at least two (respectively e...

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Problems solved by technology

In a corresponding manner, both the temperature probes placed there and the electrical lines connected thereto will be subjected to very high acceleration forces and thus to increased mechanical loads or increased mechanical stresses. risk of sabotage

Furthermore, for the purpose of detecting only the single auxiliary measured variable, additional electrical lines must be routed into the region of the converter device, which typically cannot be accommodated except for two lines for the exciter coils.

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