lobed impeller meter

lobed impeller meter

[lōbd im′pel·ər ‚mēd·ər]
(engineering)
A type of positive displacement meter in which a fluid stream is separated into discrete quantities by rotating, meshing impellers driven by interlocking gears.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.