BROOKFIELD YR-1 RHEOMETER Operating Instructions Manual ...

APPENDIX C - Calibration ProceduresThe torque sensing spiral spring in the YR-1 Rheometer is calibrated at Brookfield to be accuratewithin ±2% of full scale range of a certified master viscometer. When checking calibration in thefield with a vane spindle (spindle 71, 72, or 73) using the following procedures, an accuracy of±2% of full scale range can be expected.The accuracy of the YR-1 is verified using viscosity standard fluids which are available fromBrookfield Engineering Laboratories or your local Brookfield agent. Viscosity standards areNewtonian and, therefore, have the same viscosity regardless of spindle speed. Viscositystandards, calibrated at 25°C, are shown in Table C1 (Silicone Oils) and Table C2 (Mineral Oils).GENERAL PURPOSE SILICONE FLUIDSBEL Part No. Viscosity (cP) at 25°C5 cps 510 cps 1050 cps 50100 cps 100500 cps 5001,000 cps 1,0005,000 cps 5,00012,500 cps 12,50030,000 cps 30,00060,000 cps 60,000100,000 cps 100,000Table C1 - Silicone Viscosity Standard FluidsMINERAL OIL VISCOSITY STANDARD FLUIDSBEL Part No. Viscosity (cP) 25°CB31 31B210 210B750 750B1400 1,400B2000 2,000B11000 11,000B20000 20,000B80000 80,000B200000 200,000B420000 420,000Table C2 - Mineral Oil Viscosity Standard fluidsBrookfield Engineering Labs., Inc. Page 33 Manual No. M/02-215