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Home  >>  Products  >>  Surface Tension  >>  DuNouy Tensiometers
DuNouy Tensiometers

Precision DuNouy Tensiometer (upward direction model) - Interfacial DuNouy Tensionmeter (dual direction model )

DuNouy Tensiometers

The proven instrument for measuring surface tension - quickly - 15-30 seconds!

Ideal for checking liquids, including oils, detergents, serums, colloidal suspensions, chemicals and other products.




FEATURES APPLICATIONS SPECIFICATIONS PRICE LIST
 

 

Features

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  • Rapid Measurement - Ring method allows readings to be made in 15-30 secs. (Ideal for colloidal suspensions which exhibit rapid changes in surface tension.)
  • Direct Reading - Circular scale is graduated in dynes/cm eliminating the need for mathematical calculations.
  • Reproducible Results - Improved technique allows accurate readings to be reproduced within ±0.05 dyne/cm.
  • Portability - Compact unit comes with a carrying case for easy transport.
  • Stability - Unit is mounted on a cast tripod support with convenient leveling screws.

Platinum-Iridium

DuNouy Interfacial Tensiometer

Platinum-Iridium 6 cm Rings DuNouy Interfacial Tensiometer

 

Applications of Surface & Interfacial Tensions

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Surface and interfacial tension measurements are extremely important in the control and improvement of:
  • absorption
  • cataphoresis
  • emulsification
  • osmotic pressure
  • condensation
  • evaporation
  • miscibility
  • solubility

 

Specifications

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Precision DuNouy Tensionmeter
Provides precise readings of upward interfacial and surface tensions by the ring method to values reproducible within ±0.05 dyne/cm. This instrument is 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 D 1331. It is also specified for testing synthetic rubber lattices in ASTM Method D 1417 and determining the surface tension of industrial water and industrial wastewater in ASTM Method D 1590. Unit comes completely assembled with torsion wire, platinum-iridium ring. Includes metal case and instructions. Ship wt. 27 lbs.

Interfacial DuNouy Tensiometer
Provides precise reading of both surface and interfacial tensions by the ring method to values reproducible within ±0.05 dyne/cm. This instrument is 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. It is also 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. 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. Unit comes completely assembled with torsion wire, 6cm ring and is supplied with metal case and operating instructions. Wt. 27 lbs.


Prices

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Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices
FT-9435 Precision DuNouy Tensionmeter - Upward Direction
$5,505.00
FT-9445 Interfacial DuNouy Tensiometer - Dual Direction
6,700.00
Replacements Parts
FT-9455 Steel Torsion Wire, 3/pk for upward direction 25.00
FT-9457 Ring, Tensiometer, Platinum-Iridium, 6cm for upward direction
Replacement 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.
676.00
FT-9463 Torsion Wire, Steel, 3/pk for dual direction 25.00
FT-9464 Ring, Tensiometer, Platinum-Iridium, 6cm for dual direction
Replacement 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.
676.00



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