Measuring the interface in the extractor

In the extractor, there is an interface between the solvent and the extracted asphaltenes. This interface is typically not a clean interface, meaning that there is a zone where the two products of different densities separate. This zone is a gradient change in the density. The level is typically measured by means of a float or differential pressure. Other technologies measure the physical characteristics of the fluids. If the physical characteristics change slightly, this leads to errors in the level measurement.

Solvent deasphalting process graphic

Customer benefits

The vessels using radiometric devices in this process have a large advantage over other level technologies which tend to malfunction, or where measurement errors occur due to the coating that can occur with heavy asphaltenes. The radiometric measurement from Berthold is non-intrusive, and therefore this coating and fouling does not affect our level measurement.


  • Highly reliable measurement not affected by coating or fouling by the product
  • Can be used on high temperature and high pressure vessel
  • Easy to install on existing columns, without process downtime




Measurement solutions for the refining industry Industry brochure

English | PDF | 2.6 MB

Continuous level measurement Product brochure

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