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Equipos y ensayos para control de calidad

SVT 20 N

The spinning drop video tensio­meter, SVT 20N, is a special purpose optical instrument for measuring of conventional to extremely low interfacial tensions.


The spinning drop video tensio­meter SVT 20N is a special purpose optical instrument for measuring extremely low interfacial tensions. This measuring technique offers unrivaled possibilities for the analysis of surfactant effectiveness in the development of emulsions or in the enhanced oil recovery. Combined with the software modules SVTS 20, SVTS 21, and SVTS 22 the SVT 20N provides the following functions:

  • Automatic control of the electronic tilting base, for positioning of the rotating droplet along the rotary axis of the capillary
  • Automatic variation of the rotation speed
  • Measurement and analysis of the static, time, and temperature dependent interfacial tension (1·10-6 to 2·103 mN/m) according to the spinning  drop method and oscillating spinning  drop method.
  • Measurement and analysis of the 2D and 3D extensional relaxation of visco-elastic liquids and membrane encapsulated liquid drops by variation of the rotational speed.
  • Determination of the yield point of liquid crystalline.
  • Determination of the dispersive and polar parts of liquids on the basis of interfacial tension, with error limits.
  • Calculation of the geometry of rotating drops related to the rotary axis.


Features of the basic instrument configuration:

  • High dynamic, electronically commutated direct current motor with software controlled speed control (0 to 20 000 rev/min; ± 0.001 rev/min)  to realise speed steps (± 2 000 rev/min/s) and sinusoidal speed variations (0.01 to 200 Hz) for relaxation measurements.
  • High-performance 6-fold power zoom lens with an integrated continuous fine focus and adjustable observation angle.
  • Video measuring system with USB-camera (max. 146 images/s sample rate).
  • USB connection to PC (or Notebook).
  • LED lighting with software controlled adjustable intensity and strobe frequency.
  • Integrated touch screen for controlling basic functions.
  • Automatic, software controlled position and tilt adjustment.
  • Automatic calibration function for correcting optical distortions caused by the capillaries (cylindrical lens effects).


Temperature controlled measuring cells

The following temperature controlled measuring cells are available for the SVT 20N:

  • MC-TFC 130
  • MC-TPC 180

learn more about the temperature controlled measuring cells of the SVT


There are several accessories available for the SVT:
> Fast exchange capillary for use with measuring cell.
> Disposable syringe.
> Opcital calibration standards.

learn more about the accessories for the SVT

Software modules

There are different software modules available for the SVT 20N:

learn more about the software modules for the SVT


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Servicio de mantenimiento y calibración

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+34 943 82 00 82
+34 943 82 07 90

Consúltenos sobre SVT 20 N