![]() ![]() The frequency received by the receiver is based on the velocity of the liquid. On the diametrically opposite end of the tube is a receiver that measures the frequency of these waves. Ultrasonic waves at a certain frequency are incident upon the process liquid from an emitter. The first is based on the principle of the Doppler effect.The velocity of the liquid is measured in two ways: The flowmeter then uses the value of the measured velocity and the size of the tube to calculate the volumetric flow of the liquid. Ultrasonic flowmetersĪs the name suggests, ultrasound is used to calculate the velocity of a liquid. Finally, we look at how to interface flowmeters with PLCs.Ī basic understanding of the concepts of physics, current, and voltage connections will make it easier to follow along with this guide. We will discuss costs, suitability, accuracy, challenges associated with other flow measurement methods, and the different types of electrical signals supported by various sensors. This guide will cover different types of flowmeters and explore their operating principles. Some types of flowmeters, such as rotameters, have a local analog readout but most have a way of sending an electrical signal to a remote location in addition to a digital display. This measured change is then used in a formula for calculating the flow of the liquid or gas. In these cases, a change in a physical parameter such as temperature or pressure is measured. ![]() More often than not, flowmeters use indirect measurement principles to calculate the flow of fluids. Accurate measurements of these chemicals ensure a successful cleaning operation without damaging equipment. A similar principle is used for measuring the amount of chemicals such as acids or caustic in a CIP(Clean in place) process. The GPM(Gallons per minute) value is multiplied by the duration of the cleaning process to measure the amount of water used for cleaning. For example, in water treatment plants where filtration equipment is cleaned periodically, a predetermined volume of water has to be pumped through filters. Flow is one of the crucial parameters measured in process industries and water treatment plants, amongst other applications. ![]()
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