These advancements promote simplified operations and less reference oil usage with no separate components, while offering the same or better precision and robustness as previous TBS models. This newest TBS® model is completely redesigned and re-innovated providing multiple enhancements to electrical and temperature components, automation, calibrations, and oil injection features, dramatically improving the overall user experience. It remains the modern benchmark ‘referee’ instrument for HTHS viscometry due to its innovative measurement technique, robust design, and notable operational versatility. A liquid is allowed to flow through its capillary tube. It is also known as a glass capillary viscometer. For more accurate measurements it is held in a controlled temperature bath. Ostwald viscometer is a commonly used viscometer, which consists of a U-shaped glass tube held vertically. 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. Determine the absolute viscosity of organic liquids. The TBS® measures viscosities of fresh and used oils at multiple select shear rates and temperatures. Very accurate density measurements with uncertainties of ☐.02 to ☐. The viscometer-densimeter covers a viscosity range up to 150 µPas and a density range up to 2000 kgm3 at temperatures from 233 to 523 K and pressures up to 30 MPa. 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.Īpplying a constant and linear shear rate profile continually to the fluid makes the TBS® an absolute viscometer where ‘true’ shear rate is calculated from known dimensions and speed of rotation. An apparatus for the simultaneous measurement of viscosity and density of fluids is presented. Reference Technique for ASTM D4741 and D5481 most defined and absolute viscosity values are obtained with those configurations. High-Temperature, High Shear Rate Rotational (Absolute ) Viscosity
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