Time is measured for how long it takes the fluid sample to pass from one bulb to the other. CAPILLARY TUBES – A specific volume of fluid is placed in a U-shaped glass tube with two bulbs.These are low cost and can be dipped into the liquid to allow measurement at the point of use. There are a wide variety of cups available including Ford, Zahn, Shell, and Craftsman and even different numbers based on orifice size and the range of viscosities they’re calibrated to measure. Others feature an easy conversion for the time in seconds directly into centistokes. SSU or SUS) or Saybolt Seconds Furol (abb. Examples include Saybolt Seconds Universal (abb. In some cases, the time itself is the unit of viscosity measurement. The longer the time, the higher the viscosity. The time required to completely drain the cup through the orifice is measured. Viscosity cups work on the same pour test described above but are calibrated to ensure that an accurate measurement can be taken.
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