RotaMeter
A rotameter, also known as a variable area flow meter, is a device used to measure the flow rate of a fluid in a closed conduit. It operates based on the principle of a variable area, where the area of flow passage changes in response to the flow rate of the fluid passing through it. The typical design of a rotameter includes a tapered tube, often made of glass or plastic, with a smaller diameter at the bottom and a larger diameter at the top. Within this tube is a float—a spherical or cylindrical object—positioned in the path of the flowing fluid. As the fluid flows through the tube, the float rises, indicating the flow rate.
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