Patent ID: 6457357
Filing Date: 2002-10-01
Classification: G01N

Abstract:
A fluid density measurement device, comprising:a buoyancy element suitable for immersion in a fluid the density of which is to be measured; mounting means for the buoyancy element arranged to constrain the movement of the buoyancy element up and down about an axis of movement of the device; a weight suitable for immersion in the fluid the density of which is to be measured; mounting means for the weight arranged to constrain the movement of the weight up and down substantially parallel to the movement of the buoyancy element; a pivotable element mounted for pivotal movement about an axis substantially orthogonal to the movement axis of the device; a first link coupling the buoyancy element to a first location on the pivotable element to convert axial forces on the buoyancy element to rotary forces on the pivotable element tending to rotate the pivotable element; a second link coupling the weight to a second location on the pivotable element to convert axial forces on the weight to rotary forces on the pivotable element in order to, in use, balance the forces due to the buoyancy element, said buoyancy element, weight, pivotable element and first and second links defining movable elements of said fluid density measurement device; and means for enabling a position of the moveable elements to be determined, whereby when the weight and the buoyancy element are immersed in the fluid the density of which is to be measured, the position of the moveable elements is dependent of the fluid density.