Mass flow meter based on the coriolis principle

G - Physics – 01 – F

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73/132

G01F 1/84 (2006.01)

Patent

CA 1290595

ABSTRACT In a mass flow meter based on the Coriolis principle, two straight measuring tubes (2) are driven in opposite senses with the aid of an oscillation generator (19). From the oscillations, sensors (20, 21) derive measuring signals from which the flow can be determined. The measuring tubes (2) have a different bending strength in two perpendicular axial planes. In particular, they are stiffened perpendicular to the principal axial plane defined by their axes, for example by means of a fin (27). By means of individual masses, the natural frequency of at least the first mechanical harmonic of the measuring tubes (2) is changed so that it differs from the natural frequency of the mechanical fundamen- tal counter-oscillation by a factor x which departs from a whole number by at least 0.1. An oscillating system (38) consisting of clamped connecting tubes (12, 13) and a central car- rier (8) is designed for a natural frequency of the mechanical fundamental oscillation that is smaller than the natural frequency of the mechanical fundamental counter-oscillation of the measuring tubes (2). In this way, one can substan- tially avoid falsification of the measuring result through interfering oscillations or their consequences.

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