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en.wikipedia.org/wiki/Rotameter

A rotameter is a device that measures the volumetric flow rate of fluid in a closed tube.. It belongs to a class of meters called variable area meters, which measure flow rate by allowing the cross-sectional area the fluid travels through to vary, causing a measurable effect.

www.ckgas.com/...equipment/.../rotameter-basic-flowmeter-principles

Rotameters are a particular kind of flowmeter, based on the variable area principle. They provide a simple, precise and economical means of indicating flow rates in fluid systems. This variable area principle consists of three basic elements: A uniformly tapered flow tube, a float, and a measurement scale.

www.sensorsmag.com/components/basics-rotameters

Figure 1. The rotameter's operating principle is based on a float of given density's establishing an equilibrium position where, with a given flow rate, the upward force of the flowing fluid equals the downward force of gravity. It does this, for example, by rising in the tapered tube with an ...

automationforum.in/t/working-of-rotameter-variable-area...

##What is a rotameter? Rotameter is variable area flowmeter used to measure fluid flow. It works on the principle of upthrust force exerted by fluid and force of gravity. The buoyant force exerted on an immersed object is equal to the weight of liquid displaced by the object. Under this principle, the rotameter works with float-tapered tube system.

www.omega.com/prodinfo/Rotameters.html

Principle of Operation The rotameter's operation is based on the variable area principle: fluid flow raises a float in a tapered tube, increasing the area for passage of the fluid. The greater the flow, the higher the float is raised. The height of the float is directly proportional to the flowrate.

instrumentationtools.com/rotameter-working-principle-animation

Variable Area Flow Meters : Rotameter Working Principle Animation A rotameter is a device that measures the flow rate of liquid or gas in a closed tube. It belongs to a class of meters called variable area meters, which measure flow rate by allowing the cross-sectional area the fluid travels...

www.omega.com/Green/pdf/TECHREF_SECT_B.pdf

Rotameters The rotameter is an industrial flow meter used to measure the ... Its operation is based on the variable area principle: fluid flow raises a float in a tapered tube, increasing the area for passage of the fluid. The greater the flow, the higher the float is raised. ... Variable area Flow meters Flow reference section. B-8 When used ...

www.telelinindia.com/principles-of-rotameter-flowmeter.asp

Principles of Rotameter/Flowmeter When fluid or gas flows through a taper tube containing a float, a pressure difference of P1 and P2 is created between upper and lower side of the float. The float moves upwards by a force obtained by multiplying the pressure differential by the maximum cross sectional area of the float.

www.mathesongas.com/pdfs/products/Flowmeter-Product-Line...

Basic Flowmeter Principles (continued) Flow Measurement & Control Rotameters F l o w O M e a s u r e m e n t & C o n t r o l 353 www.mathesontrigas.com Overview Of Flowmeter Models Matheson offers a complete line of variable area flowmeters to meet your application requirements.