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19.12.2022  |  730x
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Capacitance empty detection in sulfuric acid

Level indicators working with the capacitive measurement principle can be used in all types and shapes of tanks, regardless of whether these are metallic or non-metallic.
  • PPS probe with 1-inch process connection - Chemical resistance & compact design
Due to their high sensitivity, their compactness and the range of probes, they are suitable for a wide variety of industrial process requirements. A well-known manufacturer of aluminum sulfate in Peru was looking for a compact level measurement for its raw material tanks with 98% sulfuric acid. Due to the strong corrosion caused by the acidic material, the decision was made to implement the robust capacity indicator Capanivo® CN 7000 from UWT GmbH.
Sulfuric acid is extracted from sulfur in a number of ways and is one of the most dangerous acids known in the world. The colorless and odorless chemical is viscous, water-soluble, hygroscopic and hardly corrosive. Due to its properties, sulfuric acid is used in a large number of different industries and is one of the most widely produced chemical raw materials in the world. Different sulfates are produced by reacting appropriate salts with sulfuric acid, such as aluminum sulfate obtained from aluminum hydroxide.

In the production of aluminum sulfate by a well-known chemical plant operator in Peru, 98% sulfuric acid is stored in tanks at a process temperature of around 80 °C (176 °F) and a process pressure of around 0.8 bar (11.6 psi). There is a high degree of humidity inside the container and the atmosphere is clean. The DK value is over 4. In order to coordinate a constant flow of material in the discharge pipes of the process vessel, timed to match the manufacturing process, the operations manager was looking for a robust and compact level monitoring system.

Together with the local partner SIERRA Servicios Industriales SAC. it was decided to implement the Capanivo® CN 7000 capacitance point level indicator from UWT GmbH. The devices have a robust, certified design and can be easily adapted to the respective process conditions and proportions by variable versions. The probe is only 98 mm (3.86 inches) long and has a very small 1-inch process connection made of stainless steel. That makes it ideal for recording the fill level within the narrow pipes of only around 200 mm (7.87 inches) diameter and for implementing reliable empty messages. The IP68 housing is made of polyester and polycarbonate, so it is environmentally friendly and ensures a long-term, permanent seal, even within aggressive applications. In addition, the Capanivo® sensor to be installed was equipped with a PPS probe (polyphenylene sulfide), a high-performance plastic that has a high chemical resistance to aggressive media.

Functionality, easy handling and a long product operational lifetime in accordance with the high requirements and standards of the chemical company could thus be implemented for smooth plant process support.

Capacitance sensors in additional tricky liquids applications
Strong build-up – foam - interface

Internationally certified technologies in combination with extensive industry knowledge enable UWT GmbH, together with its global partners on site, to provide tailor-made measurement technologies and compatible solutions for continuous point level detection, which can be successfully implemented in process vessels of global plants.

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 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, 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 165 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: 12.03.2024

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