The Rotameter RAGN is designed for continuous flow measurement of liquids and gases. The fluid passes through the metering tube from bottom to top and consequently needs to be installed vertically and flow direction is upwards. The conical glass metering tube includes a free rotating float which provides self-stabilization.

The actual flow is indicated by the top of the float and can be directly read from the scale on the metering tube. The Rotameter RAGN is the world´s first Glass Rotameter suitable for SIL applications and is also compliant with the Machinery Directive ISO 13849.

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  • Suitable for applications according to IEC 61508:2010 and Machinery Directive ISO 13849
  • All stainless steel design
  • Turnable splinter shield
  • Designed for aggressive applications
  • Easy to install and maintain
  • Optional limit switches with connection box


For Pipe Sizes DN 15 to DN 65 (1/2“ – 2 1/2“)
Process Connections Flanges, threaded and Clamp
Measuring Range Water 20°C: 2 ml/h – 10 m³/h
Air 20°C 1 bar abs.: 0,1 l/h – 160 m³/h
Wetted Parts Material Borosilicate glass, 1.4404 (AISI 316L) and PVDF (FDA conform)
Various float materials available
Gaskets NBR, FKM, EPDM (FDA conform)
Process Temperature -25°C to + 100°C
Process Pressure 6 to 16 bar depending on metering tube
Ambient Temperature -25°C to 100°C
Accuracy acc. VDE/VDI 3513-2(aG=50%) 1,6 %
Suitable for Applications acc. IEC 61508 and Machinery Directive IDO 13849 Yes
Additional Features
  • Limit switches for low/high alarms
  • Connection box for limit switches
  • Turnable splinter shield
  • Needle valves
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