ISA Handbook of Measurement Equations and Tables, 2nd Edition

Volumetric Methods

Positive Displacement Meters

This type of meter separates the flow stream into known volumes by vanes, gears, pistons or diaphragms, then counts the segmented volumes. They have good-to-excellent accuracy, can measure viscous liquids, and have no straight run requirements. However, they do have a non-recoverable pressure loss, and their moving parts subject to wear.

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