differential-producing primary device
differential-producing primary device
[dif·ə′ren·chəl prə‚düs·iŋ ¦prī‚mer·ē di′vīs] (engineering)
An instrument that modifies the flow pattern of a fluid passing through a pipe, duct, or open channel, and thereby produces a difference in pressure between two points, which can then be measured to determine the rate of flow.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.