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What is Glass Tube Rotameter?
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Posted by xinsheng yuyao - Filed in Other - #Fountain Solenoid Valve，Glass Tube Rotameter - 889 views
What is Glass Tube Rotameter?
Glass Tube Rotameter is an industrial flow meter used to measure the flow of liquids and gases. The Glass Tube Rotameter consists of a tube and afloat. The floating response to flow changes is linear, and a flow range or turndown ratio of 10 to 1 is standard. For OMEGA™ laboratory rotameters, greater flexibility can be achieved through the use of related equations. Rotameters are popular because of their linear scale, relatively long measuring range, and low-pressure drop. Installation and maintenance are very simple.
Operating principle of Glass Tube Rotameter
The operation of the Glass Tube Rotameter is based on the variable area principle: fluid flow will lift the float in the conical tube and increase the area through which the fluid passes. The greater the flow, the higher the float rises. The height of the float is proportional to the flow rate. For liquids, the float rises by the combination of the buoyancy of the liquid and the velocity of the fluid. For gas, the buoyancy is negligible, and the float only responds to the velocity head.
The float moves up and down in the pipe in proportion to the fluid flow rate and the annular area between the float and the pipe wall. When the upward force exerted by the flowing fluid is equal to the downward gravity exerted by the weight of the float, the float reaches a stable position in the tube. Changes in flow disrupt this balance of power. Then the float moves up and down, changing the ring area until it reaches the position where the forces are in equilibrium again. In order to satisfy the force equation, the rotameter float assumes a different position for each constant flow rate. However, it is important to note that since the float position depends on gravity, the Glass Tube Rotameter must be oriented and installed vertically.
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