Information about Liquid Flow Meters

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About Liquid Flow Meters

Liquid flow meters are used for measuring the flow or quantity of a moving fluid. They use four basic metering technologies: differential pressure (DP), positive displacement (PD), velocity, and true mass. Differential pressure flow meters obtain a liquid’s flow rate by measuring the pressure differential and extracting the square root. Examples include orifice plates, Venturi tubes, flow nozzles, Pitot tubes, target meters, elbow tap meters, and rotameters. Positive displacement flow meters divide the liquid into specific increments which are counted by mechanical or electronic techniques. These devices are often used for high-viscosity fluids. Velocity flow meters operate linearly with respect to the flow rate. Because there is no square-root relationship, their range is greater than DP devices. True mass flow meters are used to directly measure the mass rate of flow. These types of liquid flow meters include thermal meters and Coriolis meters.

Products & Services Related to Liquid Flow Meters

Flow Meters

Flow meters (flowmeters) and flow sensors are devices used for measuring the flow rate or quantity of a moving fluid or gas.

Flow Transmitters

Flow transmitters provide electrical outputs that are proportional to flow inputs. They use flow meters to measure the flow of liquids and gases.

Paddlewheel Flow Meters

Paddlewheel flow meters have a paddle wheel that is perpendicular to the flow path. The rotor axis is positioned to limit contact between the paddles and the flowing media.

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.

Rotameters

Rotameters are typically tapered glass tubes positioned vertically in the fluid flow. A float within the tube rides upward in relation to the amount of flow.

Turbine Flow Meters

Turbine flow meters measure the rate of flow in a pipe or process line via a rotor that spins as the media passes through its blades.

Vortex Flow Meters

Vortex flow meters are flow sensors that detect the frequency of vortices shed by a bluff body placed in a flow stream. The frequency of the vortices is proportional to the flow velocity.

Engineering Web: Liquid Flow Meters - Machine Design

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Flow Sensors \| Machine Design is the ability to interface meters with a computer for instantaneous flow readout to remotely control flow, or to allow unattended process operation.
Heat Exchangers \| Machine Design Liquid-to-liquid exchangers are available in single or multiple-pass, parallel, or reverse-flow arrangements.
The sound of viscosity \| Machine Design Compact acousticwavesensors make possible handheld viscosity meters like this BiODE eCup unit.

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