Home » Area Velocity Flow Meter Principle
Animation Flow Measurement

Area Velocity Flow Meter Principle

Measure open channel flow without a flume or weir. An Area-Velocity Flow Meter continuously measures both Level and Velocity to calculate flow volume in an open channel or pipe.

Area Velocity Flow Meter

Open Channel Flow Measurement

The ultrasonic sensor is installed at the bottom of a pipe or channel. To measure water level the sensor transmits ultrasonic pulses that travel through the water and reflect off the liquid surface. The instrument precisely measures the time it takes for echoes to return to the sensor. Based on the speed of sound in water, the level is measured with accuracy of ±0.25%.

Flow velocity is measured with an ultrasonic Doppler signal continuously injected into the water. This high frequency sound (640 KHz) is reflected back to the sensor from particles or bubbles suspended in the liquid. If the fluid is in motion, the echoes return at an altered frequency proportionate to flow velocity. With this technique the instrument measures flow velocity with accuracy of ±2%.

Area-Velocity Flow Meters work in partially full and surcharged pipes, rectangular, trapezoid and egg-shaped channels.

Optional – Separate Level and Velocity Sensors

A separate down-looking ultrasonic sensor can be used for highly aerated or turbulent flow applications.

It measures level by transmitting ultrasonic pulses through the air to the liquid surface with accuracy of ±0.25%.

Along with the level sensor, a submerged Doppler velocity sensor is used to measure the water velocity.

Level and Flow Measurement Animation

Source : Greyline Instruments

Articles You May Like :

Oval Gear Flow Meter

Classification of Flow

Piston Flow Meters

Coriolis flowmeter

Optical flow meter

Related Articles

DP Flow Transmitter Re-Ranging Calculation

S Bharadwaj Reddy

Flow Transmitters Questions and Answers

S Bharadwaj Reddy

Optical Pyrometer Working Principle Animation

S Bharadwaj Reddy

Gas chromatograph Working Animation

S Bharadwaj Reddy

Flow Measurement Questions and Answers

S Bharadwaj Reddy

Oscillating Piston Flow Meters Working Principle

S Bharadwaj Reddy

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

Area Velocity Flow Meter Principle

WordPress Image Lightbox
Send this to a friend