Drop and Bubble Shape Optical Tensiometer PAT-1

The Drop and Bubble Tensiometer PAT-1 uses a modern optical method to measure the dynamic Surface Tension and Interfacial Tension of liquids, 0.1 s resolution over a period of seconds up to days.
The instrument is supplied with a computer controlled dosing system.


The Drop Bubble Shape Tensiometer PAT-1 is well suited to determine the contact angle of liquids on a solid surface. The apparatus is driven by modern software.

The addition of various modular options allows the measurement of contact angle, surface rheology, elasticity, viscosity, iso-dense liquid / liquid systems, short time interfacial tension, direct drop/drop, bubble/bubble and drop/bubble interactions and fast oscillations.

Applications : surfactants, detergents, pharmaceutical, cosmetics, food, medicine and biology, ecology.

Surface and interfacial tension 1 to 1000 mN/m (dyn/cm)
Resolution 0.1 mN/m (dyn/cm)
Contact angle 10º to 180º ± 0.3º
Temperature 10 to 80ºC or 10 to 1000ºC
Dimensions (WxLxH) 24x70x24 cm (10x28x10’’)
Weight 12 kg (266 lb.)

Principle is based on the analysis of the shape of pendent and sessile drops or buoyant and captive bubbles.

  • Live interfacial tension calculation
  • Modular system with several optional measurement methods
  • Control of dosing system for accurate changes to drop or bubble