Glass tube Rotameters are variable area flow meters for measuring volumetric flow rates of liquids and Gases. The construction includes a tapered glass tube with a float moving inside it. The float position inside the tube is result of balancing of buoyancy and gravitational force. As glass is tapered from inside, gap is created between inside wall of tapered tube and the outer diameter of float and fluid flow passes through it. The external housing includes a frame, cover and end connections.

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