Rotameter - Variable Area Flowmeter

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 tube as the flow increases and its position on a scale can be read off as the flow rate. Since this measuring method is purely mechanic, it as simple as it is reliable.

  • RAGN

    Stainless Steel Design
    Designed for Harsh Applications
    Borosilicate Glass 
    Easy to Read, install and Maintain
    Optional Limit Switches
    0.04 - 44 GPM Water     
    0.09 - 90 SCFM Air

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  • RAMC

    316L Stainless Steel Construction
    1.6 % accuracy (qG = 50 %)
    4 to 20 mA signal output
    HART protocol available
    Adjustable Limit Switches
    0.95 to 550 GPM
    0.42 to 1050 SCFM

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  • RAKD

    The RAKD Rotameter is used for measurement of liquids and gases and is highly accurate, particularly for low flows and high pressure applications.

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  • RAGK and RAGL

    RAGK and RAGL are specifically designed for the measurement of low flows of liquids and gases. Their main application field is in purging, analyzer and gas sampling systems, laboratories and machinery equipment.
    Measureable Flow Rates:
    Water = 0.002 l/h to 630 l/h
    Air = 0.1 l/h to 6300 l/h

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Rotameter History

In the 1990s, Yokogawa strengthened its focus on flowmeters through the acquisition of the German flowmeter manufacturer ROTA. In so doing Yokogawa gained access to 100 years of flowmeter expertise and completed its flowmeter portfolio by adding the Rotameter (variable area) and Rotamass (Coriolis) product lines.




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