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07.09.2023  |  371x
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SIL2 for rotating paddle series Rotonivo® from UWT

Rotary Paddle Level Switch for overfill and dry run protection with SIL2 certification

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

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.

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.

Company information

UWT GmbH
UWT GmbH
The UWT has become one of the leading suppliers of measurement technology on the world market today for the level detection in silos and tanks for material manufacturing processes. When UWT started, almost 40 years ago, with the development of ingenious products. UWT supply level limit and content measurement sensors for bulk solids and liquids. A company reaches such a position only if the following key elements interact: Sound management, good understanding of the needs of the markets, innovative product solutions, skillful investment and above all, committed and dedicated employees. Different measurement techniques are used within a variety of industries depending on the medium and application in question.UWT products represent quality, flexibility and reliability in over 90 countries across the world. Having successfully solved over 1 mio. applications within the bulk solids sector, UWT has expanded still further by introducing a new and innovative product range for the liquids market which is delivering reliable solutions for applications in this area. The company is certified ISO 9001:2015 and constantly expands its portfolio of product certifications (ATEX, EHEDG, FM, CSA, INMETRO, etc.) particularly with regard to the international markets. The development, production and sales departments are located at our headquarters in Germany, with a further production site in Malta. UWT has also established successful sales offices in the USA, UK, China, India, Brazil and most recently Mexico. With this global orientation, it is possible to serve and support customers with complete competence and flexibility. From development through production to final assembly and comprehensive technical advice, UWT can offer a complete service from a single source. The strongly held belief by the CEO`s Uwe Niekrawietz, Markus Schalk and Andreas Haug is for the welfare of over 200 employees world-wide: „Healthy and happy employees can make the unbelievable happen“. Our portfolio includes sensors for liquids: * Capanivo® 7000/8000 - capacitive sensors * RFnivo® 8000 - capacitive sensors * NivoCapa® 8000 - capacitive sensors * NivoGuide® 8000 - TDR guided radar * NivoRadar® 7000 - non contact radar sensor Sensors for bulk solids: * Rotonivo® - rotary paddle * Vibranivo® - vibrating fork * Mononivo® vibrating rod * Capanivo® 4000 - capacitive sensors * RFnivo® 3000 - capacitive sensors * NivoBob® 3000/4000 - electromechanical lot system * NivoRadar® 3000/4000 - contact free radar sensor * NivoGuide® 3000 - guided radar sensor (TDR) NivoTec® - visualisation systems
Last update: 02.05.2024

Related trade show

Trade show Powtech 2023
Take advantage of the overall dynamics offered by POWTECH, the leading exhibition for experts in powder and bulk solids technology. This event provides a presentation platform for innovations and advancements in processes for the manufacture of quality products made and processed from powder, granules, bulk solids and liquids – also for the environmental and recycling sector. Good reasons for visiting 1. 360° View of mechanical Processing Technologies A picture is worth a thousand words. So choose the 360° panoramic view of the entire process chain of processing technologies and discuss the leading-edge developments in analysis, size reduction, screening, mixing, conveying, dosing and compacting with the industry’s top experts. Whether energy efficiency, sustainability, careful handling or process optimization, POWTECH 2022 as the world’s undisputed number one puts the focus on innovations that will change mechanical processing technology. 2. Clear Focus on Powder and Bulk Solids technology As an international exhibition, POWTECH reflects the trends in the industry through its exclusive focus on mechanical processing technologies – for the benefit of exhibitors and visitors. The compact event gives you easy access to the leading suppliers of basic processing technologies for powder and bulk solids, plant engineering and processing components, equipment for measurement, control and automation, products for nanoparticle technology, safety and environmental technology, plus services for mechanical processing technologies. 3. The perfect stage for work, dialogue and new contacts POWTECH is far more than just a trade exhibition. It is a stage for working and discussing and the exchange of ideas between engineers prepares the ground for valuable new contacts and business relationships. But POWTECH is also the perfect stage for newcomers: As in the past years, young innovative companies show their new product and process developments in the ”innovation made in Germany pavilion”. 4. Inspiration for tomorrow’s Processing Technologies Meetings, deadlines and pressure of costs. Do you often have no scope for creativity during your daily work? POWTECH 2022 is guaranteed to inspire you with its presentation of pioneering innovations. The accompanying programme shows you the latest trends and product developments in the fields of explosion protection, easy-to-clean solutions or cleanrooms. 5. POWTECH – the Industry Barometer Figures are worth a thousand words. 823 exhibitors from 29 countries, over 14,100 trade visitors; the figures for 2019 impressively show the importance of POWTECH for almost all branches of industry, and especially chemicals, pharmaceuticals, metal and food. All the forecasts indicate that value creation in the processing technology segment will carry on growing, so be there in 2022 when the crème de la crème discuss the latest product innovations.
26.09.2023 | Trade show | 3 days | Nürnberg | Entry: paid
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