DU-NOUY Method Precision Tensiometer
Precision. DU-NOUY, ring method, ASTM. Tensiometer gives 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 of ASTM Method D-971 and solutions of surface-active agents in ASTM Method D-1331. It is also specified for determining the surface tension of industrial water and industrial waste water in ASTM Method D-1590. The ring and support stirrup are made of platinum-iridium wire with welded joints. The ring is supported on the end of a light arm with an adjustable hook. This allows standardizing the instrument for direct readings in dynes/cm. The essential parts are mounted on a tripod support with leveling screws. The tripod and supports are finished in gray hammertone. Use T1220-1 Torsion Wires only when 4 cm. ring is utilized. Use T1240-1 only when the T1280 6 cm. ring is utilized. Monel wire is recommended for use where high resistance to corrosion is desirable. Completely assembled with T1240-1 Torsion Wire, T1280 platinum-iridium ring (6 cm); with metal case and directions. Shipping weight: 27 lbs.
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