SVT 20 N
Spinning Drop Video Tensiometer.
The spinning drop video tensio­meter, SVT 20N, is a special purpose optical instrument for measuring of conventional to extremely low interfacial tensions.&nbsp; The control/data analysis software is designed for intuative use and fast access to all control elements.&nbsp; Combined with the software packages 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&nbsp;to 2·103&nbsp;mN/m) according to the spinning&nbsp; drop method and oscillating spinning&nbsp; drop method. Measurement and analysis of the 2D and 3D extensional relaxation of visco-elastic liquids and membrane encapsulated liquids. 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)&nbsp; to realise spped 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).
 Optional SVT accessories:
 Easy mountable liquid/gas-temperature controlled measuring cell MC TFC 130; temperature range&nbsp; -10 to 130 °C. Easy mountable peltier/gas-temperature controlled measuring cell MC TPC 180; temperature range -30 to 180 °C; ±0.1 K resolution with a heat up and cool down rate of ±1 K/s. Fast-exchangeable special high-temperature glass capillaries (up to 180 °C) FEC&nbsp;622/4 0-HT. Cost-effective (disposable) fast-exchange capillaries made of polycarbonate (up to 60 °C) FEC&nbsp;780/400-P. Automatic dosing system ES-D/S. Calibration standard DCS-SVT. The available software modules for the SVT 20N are: SVTS 20&nbsp; - Interfacial Tension. SVTS 21 - Oscillation. SVTS 22 - Geometry
 Data Sheet SVT 20 N
