The Spinning drop video tensiometer SVT 25 is a compact optical measuring instrument for the
determination of low to ultra-low interfacial tensions and rheological interface properties.
Ultra-low interfacial tensions occur particularly in microemulsions which are used, for example,
in enhanced oil recovery (EOR).
Highest precision and reproducibility of the measuring results is guaranteed by a well-established
measuring technique and first grade mechanical and optical components. Due to state of the art
electronic components the SVT 25 can be operated intuitively via the TP 50 control panel.
For an efficient measuring procedure the measuring cell, with the rotating capillary, is mounted
on a tilting table, which allows the operator to easily move the drop of interest into the camera
view. The fast 6.5-fold zoom lens with fine focus enables an analysis of small and large drops alike.
Temperatures within the range of -30 °C to 180 °C can be reached inside the temperature controlled
measuring cells to simulate real working environments. With a specially designed capillary and a
resulting higher pressure tolerance, the SVT 25 instrument can even be used with water-based solutions
at up to 130 °C.
Measurement of low to ultra-low interfacial tensions based on the contour of spinning drops according to models
by Vonnegut, Cayias-Schechter-Wade or Young-Laplace
highly dynamic measurement drive with 0 … 20000 rev/min
oscillation measurements with oscillation periods of 0.5 s …∞ and max. acceleration of 500 rev/s2
motorised tilting table
fast 6.5-fold zoom lens with integrated continuous fine focus
motorised movable optics for automatically following moving drops
high-performance camera with USB 3 interface, 2/3″sensor, max. 2048 x 1088 pixel, max. 3250 frames/s
precise, fast and easy to use capillary exchange system
LED-lighting with strobe function and adjustable slit diaphragm
temperature controlled measuring cells for temperatures ranging from -30 °C to 180 °C
special capillary for measuring water-based solutions at up to 130 °C
automatic calibration function for correcting optical distortions caused by the capillaries (cylindrical lens effects)
TP 50 control panel with touch screen and precision control wheel
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