The glass tapered tube has a scale on the surface or a scale is placed adjacent to it, according to purpose. Its operation is based on the variable area principle: Spherical shape floats are used for small flows. October Learn how and when to remove this template message.
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It is one of the most commonly used rotameter in the world.
The basic function of Rotameter Flow Meters is based on the variable area theory. A change in flowrate upsets this balance of forces.
Variable Area Flow meters Working Principle
Principle of Operation The rotameter's operation is based on the variable area principle: Please help improve this article by adding citations to reliable sources. Eorking operation is based on the variable area wrking Metallic tubes are used where the process fluid with high temperature and pressure.
The tube is precision formed of borosilicate glass, and the float is precisely machined from metal, glass or plastic. A rotameter consists of a tapered tube, typically made of glass with a 'float' a shaped weight, made either of anodized aluminum or a ceramicinside that is pushed up by the drag force of the flow and pulled down by gravity.
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We'll assume you're ok with this, but you can opt-out if you wish. A float material, shapes are also wokring according to applications considering density. Relative flow capacities for some common float materials can be seen from the link below:. You are commenting using your Facebook account. To satisfy the force equation, the rotameter float assumes a distinct position for every constant flowrate.
Flowmeters are used in fluid systems liquid and gas to indicate the rate of flow of the principls. For the railway distance device, see Rotameter railway. The rotameter is popular because it has a linear scale, a relatively long measurement range, and ptinciple pressure drop. Spring and piston flow meters can be used for most fluids, including corrosive liquids and gases. Be careful to install variable area flowmeters with glass metering tubes in locations where the glass cannot be damaged.
The rotameter consists of a tube and float. Some manufacturers use a different standard.
In operation, the rotameter princkple positioned vertically in the fluid system with the smallest diameter end of the tapered flow tube at the bottom. Do you require a valve to regulate the flow?
With liquids, the float is raised by a combination of the buoyancy of the liquid and the velocity head of the fluid. A uniformly tapered flow tube, a float, and a measurement scale. October Learn how and when to remove this template message.
Floats made from more dense materials will rise less thereby yielding higher flow capacities. The float reaches a stable position in the tube when the upward force exerted by the flowing fluid equals the downward gravitational force exerted by the weight of the float.
The Basics of Rotameters | Sensors Magazine
What is the minimum and maximum process temperature? They can also control the rate of flow if they are equipped with workong flow control valve. Spherical shape floats are used for small flows.
In the case of OMEGA laboratory rotameters, far greater flexibility is possible through the use of correlation equations.