Why does Cannon offer so many different types of glass capillary viscometers? Primarily because no single capillary viscometer is ideally suited for all kinematic viscosity determinations. Individual analysts also have their own pref...
Why does Cannon offer so many different types of glass capillary viscometers? Primarily because no single capillary viscometer is ideally suited for all kinematic viscosity determinations. Individual analysts also have their own preferences. The brief descriptions on the following page may assist you in determining which viscometer is most appropriate for your particular application.
Instead of listing the precision of Cannon glass capillary viscometers, we now provide the expanded uncertainty. This is the universally accepted statistic when dealing with calibration data. In order to obtain A2LA accreditation, it is necessary to determine and specify the expanded uncertainty.
ISO publications define expanded uncertainty as “the interval about the result of a measurement within which the values that could reasonably be attributed to the measurand may be expected to lie with a high level of confidence.”
The use of expanded uncertainty instead of precision does not reflect any change in the accuracy or quality of Cannon viscometers. It is a statistical term that is more comprehensive than precision. When comparing the accuracy of viscometers it is essential that the expanded uncertainty be specified.
A certificate specifying the expanded uncertainty is provided with every calibrated viscometer. We also supply such a certificate with every bottle of viscosity standard.
Cannon Glass Capillary Viscometers – Types:
For measurement of kinematic viscosity of transparent Newtonian liquids according to ASTM D 445 and ISO 3104. Specifications conform to ASTM D 446 and ISO 3105. Provided with Cannon’s ISO/IEC 17025 certificate of calibration and instruction sheet.
Calibrated CMVC Series For measurement of viscosity of highly viscous materials such as asphalt cement at 60 °C (140 °F) according to ASTM D 2171. Applicable to materials with viscosity range of 0.036 to 80,000 poise. Vacuum of 300 mm Hg is applied to small arm with timing bulbs; two bulbs are incorporated to extend viscosity range of viscometer.