RAGL Laboratory Rotameter

The RAGL Laboratory Rotameter is ideal for measuring low flows of liquids and gases, designed with a conical glass metering tube that has a free rotating float, which is mounted in a vertical pipeline with flow direction upwards. In addition, its anti-static metering tubes allow for measurement of small quantities of gas, delivering high accuracy at low flow rates.

The flow is indicated by the top of the float and can be read from the standard scale on the metering tube or from a connected scale.

Meets High Safety Standards
The RAGL’s tube is sealed with o-rings and additional tube gaskets, which are fixed with pressure flanges for high tightness, providing a higher level of safety.

Additional Features & Options

  • Needle valves direct assembled in the head of the inlet or the outlet
  • Inductive ring sensors as limit switches available
  • Inlet and outlet flow controller available
  • Frame for panel mounting available
  • Foot plate for table installation available
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

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.


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.


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. Chlorine, on the other hand, is a very effective, time-proven chemical, but is ineffective against hard-to-kill microorganisms such as cryptosporidium; it also has some unpleasant byproducts. Ozone is recognized among the strongest, fastest, commercially available disinfectants and oxidants for water treatment, Ozone is used in both the disinfection of drinking water and bacterial killer in waste water treatment. Ozone is used in a large percentage of Municipal water treatment facilities as well as Pharmaceutical companies where pure water is essential.

Instruction Manuals
General Specifications

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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