|The new EZ Viscosity Cup Series is a logical and necessary outgrowth of the standardization studies on the Zahn Signature and similar cups for the promotion of this most popular type of viscosity measuring instrument as a national and international standard. Not only has this cup been improved with respect to earlier produced cups and designed to comply to the requirements of ASTM D 4212 but, in addition, each EZ Cup is furnished with a table which permits conversion between efflux time in seconds to the nearest tenth of a second to viscosity in centistokes. This table is particularly useful in determining efflux time in seconds when viscosity in centistokes is known.|
For those users who require documented certification of their measuring equipment, the EZ™ cups may be ordered, at an additional charge, with a CERTIFICATE of CALIBRATION . This document contains not only information on actual cup calibration with standard oils traceable to the National Institute of Standards and Technology but in addition, this certification also complies to conditions and procedures under the requirements of ANSI/NCSL Z54O-1 or MIL-STD-45662A as applicable.
The EZ™ cups are produced to very close mechanical tolerance in elaborate jigs and fixtures. Such equipment not only insures that each cup is correctly produced but also that all cups are identical. All parts of the cup are of stainless steel except for the name plate. The following table provides operating range specifications, cup midrange sensitivity and recommended calibrating oils. Following this table are graphs and mathematical formulas that relate efflux time in seconds to centistoke viscosity.
|Cup Number||Seconds Range||Centistoke Range||Midrange Sensitivity¹||Calibration Oil Number²|
|1||40 to 60||10 to 36||1.3||G-10/19|
|2||20 to 60||19 to 156||3.3||G-60/117|
|3||12 to 60||64 to 596||10.5||G-200/458|
|4||10 to 60||79 to 784||13.9||G-200/458|
|5||10 to 60||161 to 1401||24.2||G-350/878|
|¹ Stated as centistokes per second of efflux time.|
² Centistoke values are nominal - actual values printed on labels