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Product news
12.03.2024  |  2667x
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Rotary Paddle Level Switch for overfill and dry run protection

The terms ‘functional safety’ and ‘safety integrity level (SIL)’ have occurred more frequently since the publication of the international standard IEC 61508/IEC61511.

SIL2 for rotating paddle series

Particularly in systems with hazard-causing processes, such as in chemical plants, the consideration of functional safety has become indispensable. On this basis safety-related practices, design principles and error considerations must be met in order to minimize the risk of a dangerous failure.

Risk mitigation in accordance with SIL2

The UWT engineers focused on this topic and designed the rotating paddle switch Rotonivo® RN 6000 series according to the normative requirements of functional safety to ensure safety functions in a risk mitigation in accordance with SIL2. Typical safety functions are overfill and dry run protection.

Full, demand or empty

Depending on the requirements, the Rotonivo® rotary paddle switch is used as a full, demand or empty detector in storage silos or process vessels and is suitable for use in almost all solids. With its simple electromechanical measuring principle it can also be adapted for extreme process conditions. A motor driven shaft causes the vane to rotate. Once the material level reaches the vane, thereby preventing further rotation, this creates a torque, which is converted via a switch to an electric signal. Once the vane is free again of the material, the output signal is reset and the motor driven shaft rotates again.

First rotating paddle limit switch with SIL2 worldwide

As part of the functional safety issue, the electronics of the rotating paddle series Rotonivo® RN 6000 have been redesigned. This has been configured so that any failure of electrical components lead to a safe switching state of the output signal and thus a hazard by the system is avoided.
With the innovative SIL2 compliant Rotonivo® RN 6000 series operators of safety-related systems have a sensor system in accordance with their specified safety integrity level and the perfect content level measurement component in their safety circuit. Despite it is the only rotating paddle limit switch with SIL2 worldwide.

Company information

UWT GmbH
UWT GmbH
UWT GmbH is one of the world’s leading manufacturers of measurement technology for the detection and monitoring of levels, limit levels in any kind of bulk materials, solids as well as in liquids, pastes and foam. Since the founding, the product portfolio has developed and offers solutions for a variety of industries. > Headquarter with development, production and sales department in Germany > Subsidiaries in USA, Great Britain, India, Mexico, Brazil and China plus a global net of exclusiv distributors > Over a million successfully solved applications in more than 90 countries > Variety of industry solutions according to individual requirements > UWT products represent quality, flexibility and reliability Our products are named under: Rotonivo® - Rotary paddle switch incl. SIL2 version Vibranivo® - Vibrating fork Mononivo® - Vibrating rod probe RFnivo® - Capacitive level switch also with anti-corrosive Teflon® coating for flue gas cleaning Capanivo® / NivoCapa® - Capacitive level switch NivoBob® - Electro-mechanical Plumb Bob as well for Interface NivoRadar® - Radar sensors NivoGuide® - TDR guided radar NivoTec® - Level monitoring and visualisation From development and production to final assembly and comprehensive technical advice, all services are provided from a single source. The focus is on the highest quality, technical know-how and good cooperation with customers, suppliers and partners. What is particularly important to the managing directors Uwe Niekrawietz, Markus Schalk and Andreas Haug is the well-being of the 200 employees worldwide: ”Healthy and happy employees can achieve incredible things”.  The product portfolio is developed further every year and enables holistic solution concepts for a variety of industries. In addition to level and point level measurement, UWT offers monitoring and visualisation systems and complete project planning. Well-known plant manufacturers and end customers worldwide appreciate the customised solutions as well as the easy handling and durability of UWT sensors. In order to be able to pass on the best possible added value to customers in the future, UWT’s corporate strategy is consistently geared towards steady and sustainable growth.
Last update: 25.04.2024

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