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.
Details
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 |
Yes |
| Additional Features | Limit switches for low/high alarms Fine control valves Pressure controller |
Resources
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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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Downloads
Brochures
Instruction Manuals
- Rotameter Glass RAGL/ RAGK (140 KB)
- Rotameter Glass RAGL/ RAGK Ring Sensor (1.3 MB)
General Specifications
- Model RAGL Rotameter (531 KB)
Technical Information
- Detailed Description of Options (1.7 MB)
Videos
Discover how Yokogawa’s Total Insight Flowmeters with Process Guard transform operational safety and efficiency. In this video, we highlight its advanced capabilities in monitoring, diagnostics, and proactive intervention to minimize risks and maximize uptime.
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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