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Flow Meters : Positive Displacement Flow Meter

A flowmeter is an instrumentation device used to measure and record the flow rate of a gas or fluid. A positive displacement flow meter is a volumetric flow meter that measures specific quantities of fluid incrementally. As each increment of fluid is completed, the flow displaces a component in the meter to release that volume of fluid and begin the next incremental fill. Positive displacement meters come in various types and can use diaphragms, pistons, gears, or nutating disks to collect and displace the fluid.