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Viscosity testing methods3/10/2024 ![]() ![]() ![]() Spring type to measure low-viscosity samples ("L-type").There are three different rotational viscometer models: ![]() Different instrument models are available that have different spring types to cover a broad range of applications. In case of low-viscosity substances, the spring needs to be sufficiently sensitive, whereas for samples in the high-viscosity range, a more robust spring is required. The resulting driving torque depends on the rotational speed w, the spindle geometry, and the sample viscosity. The test sequence is the following: The user attaches a spindle to the rotational viscometer, sets a speed, and receives the dynamic viscosity and the torque (mostly in %). Optical sensors detect the deflection and the viscosity of the sample is then calculated from it. How do these work? The rotation of the spindle deflects a spring. Although there are two setups available to measure viscosity with a rotational viscometer – spring-type instruments and servo motor instruments – we only cover spring-type instruments here. ![]()
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