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Kapazitive Füllstandsmessung in flüssigem Naphthalin DE
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26.05.2020  |  2386x
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Capacitance point level detection in liquid naphthalene

UWT application of the month

Full detection with high process compatibility in chemical plant operation

The measurement technology a chemical plant was looking for in his liquid naphthalene tanks has to deal with different temperatures, varying DK values and viscosity. In order to meet these conditions in practice quickly and reliably with a clever solution, the capacitive rod probes of the RFnivo® series from UWT were implemented.

Changing process temperatures and caking on the sensor boom
In the liquid state, naphthalene is an aggressive substance that quickly corrodes common materials. If it becomes firmer as it cools down, it tends to become heavily attached. For the individual tanks with liquid naphthalene, the system operator therefore needed reliable and robust level monitoring, which can be flexibly adapted to the fluctuating ambient conditions. The chemical manufacturer has several storage tanks that are electrically heated to maintain the melting point of the naphthalene.

There is a process pressure of approx. 0.8 bar (11.6 psi). The DK value fluctuates between 1.6 and 2.0. Each tank was equipped with a RFnivo® installed on the overflow line for full notification to ensure reliable protection against overfilling of the containers. When the material is removed, the temperature drops very quickly and cause caking on the sensor boom. Over flow line being there at a height of 1700mm, the installed RF probes work within this over flow line under constantly changing process temperatures (max. up to 80°C (176°F). The "Active Shield" technology integrated as standard in the RF probe ensures that the measurement result is not influenced in the long term by the buildup on the probe.

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: 14.10.2024
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