DuNouy Tensiometers

• Ring method allows readings to be made in 15-30 secs. (Ideal for colloidal suspensions which exhibit rapid changes in surface tension.)
• Specified for determining interfacial tension of oil against water by the ring method in ASTM Method D971 and solutions of surface-active agents in ASTM Method D1331.
• Specified for testing synthetic rubber lattices in ASTM Method D1417 and determining the surface tension of industrial water and industrial wastewater in ASTM Method D1590.
  
• Circular scale is graduated in dynes/cm eliminating the need for mathematical calculations.
  
• Improved technique allows accurate readings to be reproduced within ±0.05 dyne/cm.
  
• Compact unit is portable and comes with a carrying case for easy transport.
  
• Unit is stable adn mounted on a cast tripod support with convenient leveling screws.
• Surface and interfacial tension measurements are extremely important in the control and improvement of: Absorption, cataphoresis, emulsification, osmotic, ressure, condensation, evaporation, miscibility, solubility
• There are two models to choose from:
  • Precision DuNouy Tensionmeter - Provides precise readings of upward interfacial and surface tensions by the ring method to values reproducible within ±0.05 dyne/cm.
  • Interfacial DuNouy Tensiometer - Provides precise reading of both surface and interfacial tensions by the ring method to values reproducible within ±0.05 dyne/cm. Graduated dial reads in both directions from zero and a double vernier is provided. The two scales and corresponding verniers have graduations and figures of different colors to indicate whether the measured force is upward or downward. The 6cm ring and its supporting frame are made of platinum-iridium wire and welded.

Precision Replacement Ring - Platinum-Iridium ring has stirrup with parallel sides that are 25mm high to permit the ring to be used in upward interfacial as well as surface tension measurements. The ring, packed in a protective container, has a mean circumference of approximately 6cm indicated to three significant figures and is marked with the ratio of the radii of the ring and cross section of the wire.

Interfacial Replacement Ring - Platinum-Iridium ring has stirrup with parallel sides that are 25mm high to permit the ring to be used in upward and downward interfacial measurements, as well as surface tension measurements. The ring, packed in a protective container, has a mean circumference of approximately 6cm indicated to three significant figures and is marked with the ratio of the radii of the ring and cross section of the wire.