Importance

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Abstract

A driver is provided for a Coriolis flow meter having a flow tube adapted to vibrate at a predetermined resonance frequency to determine mass flow rate of a fluid passing therethrough. The driver includes a coil, a ferromagnetic core disposed coaxially within the coil, and a spring adapted to resiliently fasten the ferromagnetic core and the coil to one another. The coil is adapted for being rigidly disposed on the flow tube and the ferromagnetic core is adapted to oscillate within the coil in response to excitation of the coil. The spring serves to guide and dampen the oscillations of the ferromagnetic core relative to the coil so that the driver is free from attachment to a non-moving object. A pivotable and/or flexible restraint may be provided to maintain the core along a curved path to centripetally accelerate the core. The driver may also be utilized as a free standing sensor in which the core is oscillated relative to the coil by vibration of the flow tube, so that the coil generates a responsive output signal.

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First Claim