An ultrasonic flowmeter is an inductive flowmeter that uses ultrasonic technology to measure the velocity of a sound-conducting fluid moving through it. There are two types of ultrasonic flowmeter technology: Doppler shift and transit time
Transit time measures the time difference between signals sent upstream and downstream. The differential is directly proportional to the speed of the water. Transit flowmeters are best used to measure the flow of clean liquids, and as a result, the most popular type of flowmeter is the ultrasonic time flowmeter. The Doppler shift measures the frequency difference of the sound wave reflected by gas bubbles or particles in the flow and is suitable for aerated or dirty liquids.
When contact with the measured liquid is not possible, The best gravity flowmeters for measuring fluid flow are ultrasonic flowmeters. Using this technology, ultrasonic waves flow from upstream and downstream through the pipe wall and the liquid in the pipe. By measuring the difference in round trip time and knowing the size of the pipe and the speed of the flow, it is determined.
Transfer time ultrasonic flow meters use two transducers that are mounted outside the pipe and as Ultrasonic transmitter and receiver work. Flow meters work by alternately transmitting and receiving the frequency of sound energy between two transducers.
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