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About Positive Displacement Flow Meters
Positive displacement flow meters measure the volume or flow rate of a moving fluid or gas by dividing the media into fixed, metered volumes. These devices consist of a chamber that obstructs the media flow and a rotating or reciprocating mechanism that allows the passage of fixed-volume amounts. The number of parcels that pass through the chamber determines the media volume. The rate of revolution or reciprocation determines the flow rate. There are two basic types of positive displacement flow meters. Sensor-only systems or transducers are switch-like devices that provide outputs for processors, controllers, or data acquisition systems. Complete sensor systems provide additional capabilities such as an integral display and/or user interface. For both types of positive displacement flow meters, performance specifications include operating pressure, temperature range, maximum material density, connection size, and percent accuracy. Suppliers indicate whether devices are designed to move fluid or gas.
There are several metering technologies for positive displacement flow meters. Gear meters have two rotating gears with synchronized, close-fitting teeth. Oval, spur and helical gears are often used because shaft rotation can be monitored to obtain specific flow rates. Vortex meters measure the frequency with which vortices are shed from a bluff body placed in the flow stream. Typically, the frequency is proportional to the material velocity. Nutating disc meters use media pressure to rock a disc in a circulating path without causing the disc to rotate about its own axis. A pin that extends from the disc is connected to a counter that monitors the disc’s rocking motions. Meters that measure incremental volumes of flow with a piston are also available.
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Engineering Web: Positive Displacement Flow Meters
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Blancett Flow Meters Positive Displacement Flow Meters Series 200 & 900 Positive Displacement Flow Meters for higher viscosity fluids |
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ISA | Communities Direct measurements of liquid flow happen using positive-displacement flowmeters. See International Society of Automation Information |
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ISA | Flow 2: Flow Sensors Turbine and Positive Displacement Flow Meters Magnetic Flow Meters Mass Flow Measurement - Basic Concepts, Coriolis Force and Flow Meters See International Society of Automation Information |
