Double-loop coriolis type flowmeter

Details Double-loop coriolis type flowmeter Double-loop coriolis type flowmeter

G - Physics

01

F

73/132, 73/69

G01F 1/84 (2006.01)

Patent

CA 1311943

DOUBLE-LOOP CORIOLIS TYPE MASS FLOWMETER Inventor: Peter J. Herzl, a citizen of the United States of America and resident of Morrisville, PA ABSTRACT OF THE DISCLOSURE A mass flowmeter of the Coriolis type in which the fluid to be metered is conducted through a pipe which is coiled to form a double loop. The pipe is anchored at its inlet and outlet ends and also at its center which is the junction of the two loops to define a tuning fork in which the identical loops on either side of the anchored center function as tines that are free to vibrate as well as to twist. An electromagnetic driver mounted at the vertex of the double loop is electrically energized to cause the loops to vibrate in phase opposition at the natural frequency of the tuning fork. The fluid passing through the double loop is subjected to Coriolis forces, thereby causing the vibrating loops to torsionally oscillate in accord- ance with the mass flow of the fluid. Capacitance sensors are symmetrically mounted on the respective loops to yield signals having a difference in magnitude and phase that depends on the amplitude of the torsional oscillations, these signals being applied to a differential amplifier whose output is proportional to the mass flow of the fluid.

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