Spinning drop tensiometer ? SVT 25

The Spinning Drop Tensiometer – SVT 25 is a high-precision optical instrument designed to measure ultra-low interfacial tensions and rheological interface properties with exceptional accuracy and reproducibility. It is widely used in applications such as surfactant analysis, emulsion research, and enhanced oil recovery (EOR), where precise interfacial tension measurements are crucial. The instrument incorporates state-of-the-art mechanical, optical, and electronic components, making it a powerful and versatile tool for both research and industrial applications.

Features of Spinning drop tensiometer – SVT 25

• 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

Technical Specification

Interfacial tension

• according to models by Vonnegut, Cayias-Schechter-Wade or Young-Laplace

Measuring range

• 1·10-6 … 2·103 mN/m

Measuring resolution

• 1·10-6 mN/m

Rotational drive

• high dynamic measurement drive

Rotational speed range

• 0 … 20 000 rev/min

Rotational speed resolution

• ± 0.001 rev/min

Rotational speed stability in long term experiments

• ± 0.5 rev/min

Rotational speed changes

• oscillation period: 0.5 s … ∞; max. acceleration: 500 rev/s2

Sample table

• motorised tilting table

Tilting range

• ± 15°

Tilting resolution

• ± 0.0023°

Optics

• high-performance zoom lens with integrated continuous fine focus

Zoom range

• 6.5-fold zoom (0.7 … 4.5-fold magnification)

focus range

• ± 6 mm

lateral traversing range for following moving drops

• ± 25 mm

Camera system

• USB 3 camera, 2/3′′ sensor

max. resolution

• 2048 x 1088 pixel with 180 frames/s

max. frame rate

• 3250 frames/s with 2048 x 60 pixel

Illumination

• LED-lighting with strobe function and adjustable slit diaphragm

Temperature control

• measuring cell with temperature control system

Via liquid circulator (MC-TFC 25)

• -10 … 130 °C

Via Peltier element (MC-TPC 25)

• -30 … 180 °C

Via electric heating (MC-TEC 25)

• RT … 140 °C

Temperature measurement

• Pt100 sensor for –60 … +450 °C ± 0.01 K; precision 1/3 DIN IEC 751 (±0.03%), class B

Device control

• via TP 50 control panel and software

Dimensions (L [mm] x W [mm] x H [mm])

• 420 x 290 x 370

Weight

• 25 kg

Power supply

• 100 … 240 VAC; 50 … 60 Hz; max. 200 W

Temperature controller TCU

• required for temperature control systems with Peltier element or electric heating

Dimensions (L [mm] x W [mm] x H [mm])

• 220 x 180 x 100

Weight

• 3 kg

Power input

• 90 … 264 VAC; 47 … 63 Hz; max. 650 W