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19.05.2021  |  245x
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Mononivo® from UWT for process optimisation for hydropower plants

Solutions in the dam - Compact limit switch for process optimisation for hydropower plants as a backwater detector for wood chip conveyance
One of the largest energy supply companies in the UK was looking for modern equipment for its northern dam with flexible metering technology. The electricity and natural gas supplier for local households and businesses has been focusing on hydropower generation for several years, in addition to wind power.
The centrepiece of the dam’s hydropower plant is the installed wood chip system, which was recently implemented to curb pollution in the dam. Accumulated wood chips are transported to a designated storage area via a series of chain conveyors. These chain conveyors need to be monitored with modern and robust measurement technology. Namely, an indicator that functions as a full detector is required in the transfer chutes in order to detect a blockage with the wood chips in good time.

Together with the subsidiary UWT (UK) Ltd in Shrewsbury, a safe solution was found after several tests with oscillating probes that work according to the vibration principle. The Mononivo® MN 4020 with tube extension was installed in the transfer chutes and reliably detects the wood chips. The bulk density of the chips is 450 g/l, the process temperature is up to 80°C (176°F). Due to the application, there is high humidity in the process area. The process pressure is around 0.8 bar (11.6 psi). The corrosion is relatively severe and required a detector with a high surface quality. With the adjustable sensitivity and the small 1 inch connection threads, the stainless steel single rod probe could be perfectly configured to the application. Optimal for use in wood chips and wood shavings is the fact that, due to the design, no material can accumulate on the sensor arm, which prevents faulty switching in the long term.

The vibrating rod is stimulated to vibrate by piezo elements. Material in contact stops the vibration, causing a change in voltage in the piezo elements. This is registered electronically. A switching output is activated. The vibration also causes a self-cleaning of the level probe to a certain extent.

The dam, with its height of 16.5 metres and length of 139 metres, is one of the most important energy suppliers for the region. With the installation of the corrosion-resistant min / max detectors, the process flows in the hydroelectric power plant could be optimised quickly and easily with regard to the overfill protection of the wood chip system.

Company information

UWT GmbH - Level Control
UWT GmbH - Level Control
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 70 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 and most recently Russia. 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 CEO Uwe Niekrawietz is for the welfare of over 155 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® - capacitive sensors * NivoGuide® - TDR guided radar Sensors for bulk solids: * Rotonivo® - rotary paddle * Vibranivo® - vibrating fork * Mononivo® vibrating rod * Capanivo® 4000 - capacitive sensors * RFnivo® 3000 - capacitive sensors * NivoBob® - electromechanical lot system * NivoRadar® - contact free radar sensor * NivoGuide® 3000 - guided radar sensor (TDR) NivoTec® - visualisation systems
Last update: 28.06.2021

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