Cone Plate Wells Brookfield Viscometer

The Wells-Brookfield Cone/Plate Viscometer gives researchers a sophisticated instrument for routinely determining the absolute viscosity of fluids in small sample volumes. Its cone and plate geometry provides the precision necessary for the development of complete rheological data.

PRINCIPLE OF OPERATION

The Wells-Brookfield Cone/Plate Viscometer is a precise torque meter that is driven at discrete rotational speeds. The torque measuring system, which consists of a calibrated beryllium-copper spring connecting the drive mechanism to a rotating cone, senses the resistance to rotation caused by the presence of sample fluid between the cone and a stationary flat plate.

The resistance to the rotation of the cone produces a torque that is proportional to the shear stress in the fluid. This reading is easily converted to absolute centipoise units (mPa·s) from pre-calculated range charts. Alternatively, viscosity can be calculated from the known geometric constants of the cone, the rate of rotation, and the stress-related torque.