Information about Ultrasonic Flow Meters

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About Ultrasonic Flow Meters

Ultrasonic flow meters use sound waves to determine flow rates. They can be either Doppler Effect meters or Time-of-Flight meters. Doppler Effect meters measure the frequency shifts caused by fluid flow. This frequency shift is proportional to the fluid's velocity. In order for Doppler flow meters to work properly with a liquid, particles must be present (measuring "pure" liquids is not possible). Time-of-Flight meters use the speed of the signal traveling between two transducers. This signal increases or decreases with the direction of transmission and the velocity of the fluid being measured. When used with liquids, both types of ultrasonic flow meters work best with a less than 10% by volume content of suspended solids or air gaps.

Products & Services Related to Ultrasonic Flow Meters

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.

Volumetric Liquid Flow Switches

Volumetric liquid flow switches measure the flow or quantity of a moving fluid in terms of a unit of volume per time, such as liters per minute. These flow sensing devices have a switch output.

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: Ultrasonic Flow Meters - Machine Design

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Ultrasonic Flowmeter \| Machine Design
Ultrasonic Flowmeter \| Machine Design Hedland Flow Meters, 8635 Washington Ave., Racine, WI 53406, (800) 433-5263, www.hedland.com
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.

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