Measures flow by inferring the flow through a pipe from some physical property of the flow stream, such as, differential pressure; orifice plates; flow nozzles; venturi tubes or variable area rotameters. A differential pressure drop device creates a pressure drop an obstruction in the flow.
Niagara Meters Series
ForceMeter™ Target Meter
Flow in the ForceMeter™ target meter is measured in terms of dynamic force acting on a target (solid disk) in the flow stream which is translated into an electrical output proportional to flow.