This proves particularly useful with multi-grade oils and their influence on fuel efficiency.ĭeveloped in 1979 and under several patents, the TBS Viscometer became the world’s first high shear viscometer. The TBS measures the viscosities of fresh and used oils at multiple select shear rates and temperatures. Applying a constant and linear shear rate profile continually to the fluid makes the TBS an absolute viscometer where the ‘true’ shear rate is calculated from known dimensions and speed of rotation. High-Temperature, High Shear Rate Rotational (Absolute) Viscosity: The coaxial Rotor/Stator design permits the exact measurement of rotor position and the torque response of the liquid’s resistance to flow (viscous friction), which determines the apparent fluid viscosity.
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