Patent ID: 8356509

Claim:
A fluid density measuring apparatus comprising: a first mass having a first weight and a first volume; a second mass having a second weight and second volume, said first weight being substantially the same as said second weight and said first volume being greater than said second volume; a first torque shaft having a longitudinal axis secured non-rotatively to a housing structure; a first balance beam non-rotatively secured to said first torque shaft with respective moment arms extending in opposite directions from said first torque longitudinal shaft axis; first and second links secured at one respective end to a respective moment arm and another end to said housing structure, said first and second masses suspended from respective links between said ends; coupling means non-rotatively secured to said first torque shaft for translating torsional displacement of said first torque shaft to angular displacement of a first torsional element about said longitudinal axis; electrical sensing means for converting said angular displacement of said first torsional element to a proportional change in an electrical property; and, means for translating said electrical property change to a value corresponding to a density of a fluid in which said masses are immersed.