Cannon CMRV-5000 Instruction & Operation Manual

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Cannon CMRV-5000 Instruction & Operation Manual Manual pdf 64 page image

56CANNON® Mini-Rotary Viscometer CMRV-5000 Instruction & Operation ManualVersion 1.0b—August, 2011; CANNON® Instrument Company2139 High Tech Road • State College, PA • 16803 • USANOTE Most commercial oils do not have a yield stress when tested as specifiedby the SAE J300 Viscosity Classification.For the complete, definitive description of the ASTM D 4684 method,see the provided Standard Test Method for Determination of Yield Stressand Apparent Viscosity of Engine Oils at Low Temperature, Designation:D 4684, also available in the Annual Book of ASTM Standards, Volume05.03.NOTE Nothing in this manual is intended to supersede the provisions of theASTM test method.The cooling cycles used in the ASTM D 4684 test method are sometimesreferred to as the TP-1 cycles. For details, see ASTM D 4684 andHenderson, K. O., Manning, R. E., May, C. J., and Rhodes, R. B., “NewMini-Rotary Viscometer Temperature Profiles That Predict Engine OilPumpability,” SAE Paper No. 850443.Required test time The ASTM D 4684 temperature program (profile) requires 45 to 54hours to complete, depending on the final test temperature. Additionaltime is required to perform yield stress and apparent viscosity measure-ments.ASTM D 3829 methodFor the complete, definitive description of this method, see the providedStandard Test Method for Predicting the Borderline Pumping Tempera-ture of Engine Oil, Designation: D 3829, also available in the AnnualBook of ASTM Standards, Section 5, Volume 05.03.NOTE Nothing in this manual is intended to supersede the provisions of theASTM test method.ASTM Method D 3829 offers the option of reporting that the BPT(borderline pumping temperature) is below a certain temperature. Thetemperature control profiles for the CMRV-5000 are designed to run thetest at the limiting BPT for each viscosity grade. Thus, viscosity or yieldstress values must be below the critical values for an oil to be acceptable.The temperature profile for this method consists of a 2-hour soak at 80°C± 3°C, a 10-hour nonlinear cool-down to the test temperature, and a 6-hour soak at the test temperature. The entire temperature profile, up tothe point of measuring yield stress and viscosity, requires about 18.5hours.ASTM D 6821 methodFor the complete, definitive description of this method, see the providedStandard Test Method for Low Temperature Viscosity of Drive LineLubricants in a Constant Shear Stress Viscometer, Designation: D 6821.NOTE Nothing in this manual is intended to supersede the provisions of theASTM test method.