The Rotameters 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. Integrated needle valves are optionally available and are used for the fine adjustment of the flow. These simple and affordable Rotameters have a very broad application range, large variety in cones and floats and decades of proven design. The Rotameters RAGK and RAGL complete Yokogawa's Metal and Glass Rotameter Portfolio suitable for SIL applications and applications complying to the Machinery Directive.

Get a Quote
Ask an Expert



  • Suitable for applications according to IEC 61508:2010 and ISO 13849
  • Space-saving design
  • Needle valves for fine adjustment of flow
  • Negligible pressure loss
  • Cost-effective solution


For Pipe Sizes 1/4" to 3/8"
Process Connections
  • Threaded
  • Swagelok
  • Cutting Ring
  • Nozzle
  • Measuring Range
  • Water 20°C: 2 ml/h – 600 l/h
  • Air 20°C 1 bar abs.: 0,1 l/h – 6300 l/h
  • Wetted Parts Material
  • Borosilicate glass, 1.4571 (AISI 316Ti) or Polypropylene
  • Various float materials available
  • Gaskets NBR, FKM, PTFE
    Process Temperature -25°C to + 130°C
    Process Pressure 16 bar
    Ambient Temperature -25°C to 80°C
    Accuracy acc. VDE/VDI 3513-2(qG=50%) 1,6 % / 2,5% / 4%
    Ex-approvals ATEX
    Suitable for Applications acc. IEC 61508 and Machinery Directive IDO 13849 Yes
    Additional Features
  • Limit switches for low/high alarms
  • Fine control valves
  • Pressure controller
  • Name Description File Type  
    Rotameter Brochure A look at all the various types of rotameters and their applications; including, Metal, Glass, and Plastic pdf icon
    684 KB
    Rotameter Overview A technical overview of the rotameters with basic detailed specifications pdf icon
    1.00 MB
    Rotameter Configuration Tool Selectable table to help determine the type of Rotameter that is right for your application xls icon
    1.40 MB
    RAGL GS Sheet RAGL (Glass Rotameter) General Specifications pdf icon
    716 KB
    Name Description  
    Rotameters and Biodiesel Production

    With the increased interest in green energy and renewable fuel sources, Biodiesel has emerged as a viable alternative to standard petroleum based diesel and home heating oil. It has zero CO2 emissions and can be created from waste vegetable oil or rendered animal fat. The number of Biodiesel processing plants has grown to over 2500 in the US alone.

    Learn More
    Rotameters and Bubble Tube Purge for Level Measurement One of the most widely used methods of monitoring / controlling liquid level in a tank is the use of Bubble Tubes with Pressure or Differential Pressure Transmitters. Learn More
    Rotameters and Ozone Generation for Water Treatment For nearly 100 years, ozone has been used all over the world for water sanitation. It is nature's strongest oxidizer and has a byproduct of pure oxygen.  Learn More
    Rotameters and Solar Silicon Wafer Production One of the major prohibitive factors for expanding solar power in the market place is the high cost. The primary cost drivers in solar cell marketing are materials and manufacturing processes. Learn More

    All Products Guide
    All Products Guide
    PDF (26.47 MB)
    (8:00 TO 17:00 EASTERN)

    live chat service provider