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Introduction The ability to measure flow rate is another important process measurement. There are four different classes of flow measurement transducers: differential pressure measurement, velocity-based measurement, positive displacement measurement, and mass flow measurement. Differential pressure measurement devices can be separated into restrictive…
Introduction The Doppler effect is a method to measure linear velocity. When a narrow laser beam (or radio beam or ultrasonic beam) is focused on an abject, the beam will be reflected back to the source. But if the object moves, the…
Cavitation and flashing are two main kinds of noise in flowmeters and in control valves. Cavitation: When the decreased line pressure approaches the vapour pressure of a liquid in the line, cavitation begins. Otherwise, cavitation is boiling of the liquid caused…
Introduction Turbine flowmeter have rotor-mounted blades that rotate when a fluid pushes against them. They work on the reverse concept to a propeller system. Whereas in a propeller system, the propeller drives the flow, in this case the flow drives and rotates…
Introduction There are two types of ultrasonic flow measurement: – Transit time measurement – Doppler effect The fundamental difference is that the transit-time method should be used for clean fluids, while the Doppler reflection type used for dirty, slurry type flows. …
Introduction A rotameter measures the flow of liquids, gases and steam by using a float inside a conical tube. The rotameter principle is one of the oldest and most mature principles in flow measurement. The space between the tube and the float…
Why use square root extractor for DP transmitter? The DP flowmeters measure the differential pressure across the constrictions made in the flow channel. The differential pressure measured has nonlinear relation with flow through the pipeline. Differential pressure developed by a venturi, orifice plate,…
The primary devices used in open channel flow measurements are weirs and flumes. Unlike the flow through the closed channel, the height of the flow level is measured in relation to the flow of open channel flow. Open channel flow meter working…
Rotameter is a variable area flow meter, works for measuring the flow of low viscous fluid at high velocity. A variable-area flowmeter is one where the fluid must pass through a restriction whose area increases with flow rate. Principle: It works on…
Introduction Differential Pressure Transmitter convert pressure measurements into a proportional 4-20 mA or a 1 – 5 Vdc output signal that functions as the input to a controller, recorder, indicator or similar device. These transmitters find application in the gas, water, and process…