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RAGK/RAGL Small Laboratory Rotameters

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.


  • 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 ISO 13849
Additional Features Limit switches for low/high alarms
Fine control valves
Pressure controller

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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. A small but uninterrupted flow of air or inert gas is forced down through a dip tube which extends to near the bottom of the tank. The back pressure of the introduced gas is a function of the liquid level or head in the tank. The pressure transmitter takes the back pressure and converts it to an analog signal that is sent to the control room. The plant operator will then be able to monitor the exact level in the tank.


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Instruction Manuals
General Specifications
Technical Information

Product Overviews

    Product Overview

    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.In the 1990s, Yokogawa strengthened its focus on flowmeters through cooperation with and the eventual 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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