Patent ID: 8333121
Filing Date: 2012-12-18
Classification: G01F,G01N

Abstract:
1. A measuring system for a medium flowing in a pipeline, said measuring system comprising: a measuring transducer of the vibration-type, through which medium flows during operation and which serves for producing oscillatory signals dependent on a viscosity of the flowing medium and/or dependent on a Reynolds number of the flowing medium; and a transmitter electronics electrically coupled with said measuring transducer for driving said measuring transducer and for evaluating oscillatory signals delivered by said measuring transducer, said measuring transducer including a transducer-housing, of which an inlet-side, first housing end is formed by means of an inlet-side first flow divider having exactly four, mutually spaced flow openings, and an outlet-side, second housing end by means of an outlet-side second flow divider having exactly four, mutually spaced flow openings, for conveying flowing medium, said measuring transducer including exactly four, straight measuring tubes connected, for forming a tube arrangement with four flow paths with parallel flow, with said first and second flow dividers, of which measuring tubes a first measuring tube, opens with an inlet-side, first measuring tube end into a first flow opening of said first flow divider and with an outlet-side, second measuring tube end into a first flow opening of said second flow divider, a second measuring tube, opens with an inlet-side, first measuring tube end opening into a second flow opening of said first flow divider and with an outlet-side, second measuring tube end into a second flow opening of said second flow divider, a third measuring tube, opens with an inlet-side, first measuring tube end into a third flow opening of said first flow divider and with an outlet-side, second measuring tube end into a third flow opening of said second flow divider, and a fourth measuring tube opens with an inlet-side, first measuring tube end opening into a fourth flow opening of said first flow divider and with an outlet-side, second measuring tube end into a fourth flow opening of said second flow divider; and said measuring transducer including an electromechanical exciter mechanism for exciting and maintaining mechanical oscillations of the four measuring tubes; wherein: said transmitter electronics is adapted to feed electrical excitation power into the exciter mechanism by means of a variable and/or, at least at times, periodic, first electrical driver signal supplied to the exciter mechanism; and said exciter mechanism is adapted to convert the electrical excitation power at least partially, both into torsional oscillations of said first measuring tube and into torsional oscillations of said second measuring tube opposite-equal to the torsional oscillations of said first measuring tube, as well as into torsional oscillations of said third measuring tube and into torsional oscillations of said fourth measuring tube opposite-equal to the torsional oscillations of said third measuring tube.