Drop Volume Tensiometer


Analysis for emulsions under dynamic conditions

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An emulsifier acts by reducing the interfacial tension between oil and water. But because this requires a certain amount of time, the effect can be quite different depending on the process dynamics. The DVT50 Drop Volume Tensiometer analyzes this time dependence for very fast to slow processes precisely and fully automatically. The measurement results support you in the optimization and formulation of emulsions and emulsifiers.


  • Emulsifiers in the pharmaceutical and cosmetics industry

  • Emulsifiers in food production

  • Enhanced oil recovery (EOR)

  • Surfactant development

  • Investigation of fuel-water mixtures

  • Testing the aging status of transformer oils as specified in IEC 62961:2018

Measuring methods

  • Dynamic surface or interfacial tension using the volume of a drop when it detaches from a capillary

Measuring results

  • Dynamic interfacial tension using drops of oil in an aqueous surrounding

  • Dynamic interfacial tension using drops of an aqueous phase in oil

  • Surface tension of a liquid

  • Sample temperature

Automatic, accurate analysis at process temperatures

The instrument analyzes the samples fully automatically and without interruption, thanks to self-refilling of the dosing syringe. The special design of the dosing capillary ensures high accuracy and dispenses with the calculation of corrections, which are otherwise necessary with drop volume measurements.


Precision also distinguishes the instrument’s temperature control unit, which works quickly and avoids measurement variations due to thermal imbalance. A wide temperature range enables process conditions to be simulated in order to optimize the addition of surfactants as emulsifiers for the actual conditions.



Variable measuring arrangement for different types of emulsion

With the DVT50, we have provided a flexible arrangement of measuring cell and dosing capillary to facilitate the simulation of the proportions in oil-in-water emulsions and water-in-oil emulsions. The results therefore enable the particular emulsion type to be optimized. To achieve fast sample changeover and correspondingly high sample throughput, we have made sure that the instrument is easy to handle when filling and cleaning.



Transparency in measurement and data management

With integral and adaptable measuring templates, the software reduces your preparation time to a minimum. Results management is easy thanks to automatic overview diagrams, comprehensive measuring reports and clear data organization.