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

Variable area (VA) flow meters (rotameters) from Brooks set the industry standard for reliability and long operating life measuring gas and liquid flows.

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

Variable area flow meters are simple and versatile devices that operate at a relatively constant pressure drop and measure the flow of liquids, gases, and 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://new.abb.com/products/measurement-products/flow/variable-area-flowmeters

ABB is a supplier and manufacturer of variable area flow meters, which are a cost effective solution for measurement applications.

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://library.e.abb.com/public/c125698f006840e9c1256a7f003f7ae1/D184B003U46.pdf

1 Principle of Operation. The principles of operation of the Variable Area Flowmeters are described in the VDI/VDE-Guideline. 3513 as follows: The Variable ...

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  ...

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://www.youtube.com/watch?v=Pz-Mvdc6nf4

Jul 22, 2013 ... The basics of the measuring principle of Variable Area Flowmeters in a few minutes. Interested in more details in Variable Area Flow ...

https://www.badgermeter.com/technologies/variable-area-flow-meters/

Variable Area Flow Meters measure volumetric flow of liquids and gases with technology based on the variable area principle by Badger Meter. Learn more ...