The PCE-125 series Ford Flow Cup Meter uses gravity to measure the flow rate of a liquid. Under ideal conditions, flow rate is proportional to kinematic viscosity. Thus, a Ford cup is used to determine the kinematic viscosity of fluids. However, the Flow Cup Meter should only be used with low-viscosity fluids. High-viscosity liquids and thick pastes are not suitable for measurement by means of a Ford cup. The structure of a Flow Cup Meter is standardized according to ASTM D1200 (Ford).
Cover the holes at the bottom of the orifice and pour in the liquid to be measured. Make sure that the Flow Cup Meter is completely filled. Use the glass plate to scrape off any excess liquid from the edge of the Flow Cup Meter. Uncover the holes at the bottom of the orifice. Negative pressure will keep the liquid in the cup until you're ready to begin measuring. Active a stopwatch (not included) while simultaneously removing the glass plate from the cup horizontally. As soon as the flow is interrupted for the first time, stop the watch and write down the time.