https://www.omega.co.uk/literature/transactions/volume4/variable-area-flow.html

The rotameter is the most widely used variable area flowmeter because of its low cost, simplicity, low pressure drop, relatively wide rangeability, and linear ...

https://www.brooksinstrument.com/en/products/variable-area-flow-meters

As one of the pioneering manufacturers in variable area (VA) flow meter ( rotameter) technology, Brooks Instrument has created a diverse and proven portfolio of ...

https://krohne.com/en/products/flow-measurement/flowmeters/variable-area-flowmeters/

For simple and cost-effective flow measurement of gases or liquids without auxiliary power. Glass and metal tube purgemeters for low-flow applications 1⁄2"  ...

https://www.yokogawa.com/us/solutions/products-platforms/field-instruments/flow-meters/variable-area-flow-meter-rotameters/

The Variable Area Flowmeter is one of the oldest and mature principles in flow measurement with its simple design: a float rises inside a conically shaped glass  ...

http://www.davis.com/blog/2013/11/18/all-about-variable-area-flowmeters-and-rotameters/

Nov 18, 2013 ... Variable-area flowmeters, or rotameters, operate on the principle that the variation in area of flow stream required to produce a constant ...

https://new.abb.com/products/measurement-products/flow/variable-area-flowmeters

Variable area flowmeters are the most cost effective solution for almost all applications involving the measurement of industrial process liquids, gases or steam.

http://www.dwyer-inst.com/Product/Flow/Flowmeters/VariableArea/

Variable Area Fluoropolymer Flowmeters are ideal for high purity or corrosive liquid applications. Applications include chemical injectors and deionized water ...

https://www.swagelok.com/en/product/Measurement-Devices/Variable-Area-Flowmeters

Explore our line of Variable Area Flowmeters for measuring gas and liquid flow.

https://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 ... expanded the range of applications for the variable area flowmeter, since the ...

https://www.youtube.com/watch?v=bnuWxvK8v6g

Apr 1, 2012 ... ROTAMETERs™ (Variable Area Meters) are named after ROTA, one of the European inventors of this flow principle in the beginning of the ...