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Ultrapure liquid flow meters are the ideal solution for measuring fluids that must remain uncontaminated and pure. Used predominantly in the pharmaceutical and power industries, ultrapure liquid flow meters ensure accurate analyses and maintain safety. This type of flow meter ensures that the ultrapure liquid remains free from contamination during the measurement process.nhttp://proteusind.com/flow-meter-for-ultrapure-liquids/n

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ultrasonic mass flow meter for industries

Ultrasonic Mass Flow Meter for Industries

Ultrasonic flow measurement is based on the principle of transmission and receipt of sound

waves, which have a unique quality of bouncing off most objects - solid, liquid or gaseous. This

technology is vastly different from traditional flow measurement technologies that use turbines

or thermal sensors to measure the flow rate of fluids.

Demand from industry for higher accuracy and lower

costs have led to development of ultrasonic flow

measurement technologies that fulfill meet the

requirements of wide range of applications and

processes. While there are number of different

technologies in ultrasonic measurement currently

available in the market, these can broadly be

categorized into four types. This categorization is based

on the principle on which these technologies are based.

Transit-time Technology

This the original ultrasonic technology developed for

measurement of flow rate of fluids. The technology uses the transit time of sound waves to

measure velocity. An ultrasonic flow meter based on this technology has two ultrasonic

transducers. These transducers act as both transmitters and receivers of ultrasonic sound waves.

To measure the flow rate or velocity of fluid - either gas or liquid through the pipe, the flow

meter alternates between sending and receiving bursts of ultrasonic sound waves through the

transducers. The time taken by the sound waves to travel from the transmitting transducer to the

receiving one gives an exact reading of the velocity of liquid in the pipe.

Ultrasonic Doppler Technology

This technology also works by using two ultrasonic sound

transducers. However, unlike the transit-time technology,

Doppler utilizes one transducer as a continuous transmitter

of ultrasonic sound waves. The other transducer acts as a

continuous receiver. Sound waves introduced into the flow

are reflected or scattered back off suspended particles or

bubbles in the fluid and captured by the receiving


The reflection causes a frequency shift in the sound waves,

which is known as the Doppler Effect. By measuring this

frequency shift it is possible to determine the flow velocity

of the fluid in the pipe. This velocity, when computed with the cross-section area of the pipe

gives the flow rate of pipe flow.

cross correlation measurement technology

Cross-correlation Measurement Technology

Cross-correlation measurement technology works on the principle that turbulent flow of a fluid is

formed of eddies that have nearly consistent characteristics across a small cross-section of flow.

This is known as the correlation length. A flow meter based on cross-correlation measurement

technology has two ultrasonic sensors placed along the direction of flow of fluid.

The first or upstream sensor picks up the signature of turbulence L/V seconds before the second

or downstream sensor, where L is the distance between the two sensors and V is the velocity of

flow of fluid. The velocity thus turns out to be L/T, where T is the time delay in detection

between the two sensors.

Acoustic Doppler Velocity Profiling Technology

The acoustic Doppler Velocity Profiling technology works on the same principle as the Doppler

technology, with the difference that it uses three transducers instead of two. One of the

transducers is a narrow-beam transducer while the other two are large angle ones. The three

transducers are arranged in a straight line with the narrow angle one positioned directly above

the flow while the other two ones are placed on either side of it.

The middle transducer emits ultrasonic sound waves at a fixed Pulse Repetition Frequency

(PRF), which get scattered from particles within the fluid. The other two transducers receive

these reflected waves and provide a "pulse-to-pulse" algorithm. This in turn allows the

measurement of the Doppler shift in two different directions, which can be used to create a 2D

velocity profile.

Take a look at other relevant information about flow meter products and applications including

ultrasonic flow meter for liquids products as well as best ultrasonic flow meter