Patent ID: 9267872
Filing Date: 2016-02-23
CPC Classification: G01N

Claim Text:
1. A fluid properties measurement device, including: (a) a symmetric resonant element having a first mass and a second mass, balanced to said first mass and coupled to said first mass by a torsional spring, having a nodal support between said first mass and said second mass, said torsional spring further including a radially central element, having an outer surface, and a radially outer element, having an inner surface, mutually separated by a void defined by said outer surface and said inner surface, and joined together at its longitudinal ends; (b) a chamber having at least one opening and accommodating said first mass, free of mechanical constraint; (c) a driving and sensing assembly, adapted to drive said first mass in torsion and sense resulting torsional movement of said first mass; (d) wherein said torsional spring passes through said opening which is sealed about said torsional spring at said nodal support; and (e) wherein said second mass is free to be placed into a fluid, for fluid property measurements.