Cannon-Fenske Opaque
Viscometers

Calibrated CFOC (9721-F50) Series

Reverse-flow type, for measurement of kinematic viscosity of dark Newtonian liquids according to ASTM D 445 and ISO 3104. Permit measurements of liquids whose meniscus cannot be seen at the timing marks when using Cannon-Fenske Routine-type viscometer. Used to measure kinematic viscosity of liquid (cutback) asphalts and road oils at 60°C (140°F) in range of 30 to 6000 centistokes according to ASTM D 2170. Also used to study lubricating oils at low temperatures when investigating the effect of various additives on lubricating and hydraulic oils. External pressure can be applied to vary shear stress and shear rate. Specifications conform to ASTM D 446 and ISO 3105 for single determinations of viscosity for opaque liquids. Upper bulb may be used for determining the degree of non-Newtonian behavior of the sample. Read more about the significance of expanded uncertainty.

Provided with certificate of calibration and instruction sheet.

Uncalibrated CFOU (9721-E50) Series

Similar to 9721-F50 series, but uncalibrated.

• Minimum sample volume 12 mL. Require liquid bath depth of 229 mm (9 inches).
• Size 25 has approximate constant 0.002 cSt/s and range of 0.4 to 2 cSt.
• Holder is not supplied. For holders, see 9726-M50 and 9726-M53.
• For replacement micro stoppers, see 9726-N98.
  
  

Viscometers with special constants are available by special order at additional cost.