In turbine meters, the metered volume is determined by revolutions of which component?

• A. The casing
• B. The valve
• C. The rotor
• D. The gasket

Answer: (C)

In turbine meters, metered volume comes from counting how many times the internal rotor turns. The fluid pushes on the rotor blades, causing the rotor to spin, and a sensor tracks each revolution (or pulses per tooth). Because the rotor is designed to move a fixed amount of fluid with every turn, the total volume can be calculated by multiplying the number of revolutions by the known displacement per revolution. The casing simply houses the moving parts, the valve may regulate flow but doesn’t measure it, and the gasket seals joints—none of these determine the metered volume. So, the rotor’s revolutions are what establish the metered volume.