M21-400 REV.1.1 DVPLUS DIGITAL VISCOMETER - OPERATIONAL MANUAL
2-12.12
2.13 Custom Spindle:
A Custom Spindle can be created when the user has developed a new spindle geometry or when using a standard
AMETEK Brookfield spindle in a non-standard measurement container. The Custom Spindle, once created, will be
available to users through the Spindle selection in Configure Viscosity Test.
A Custom Spindle is created by selecting the Custom Spindle button in the Settings menu. A Custom Spindle
requires a code, a name, an SMC value and an SRC value.
Code - The code is the numerical value used to select the spindle. This value must be unique and cannot be the
same as a standard Brookfield spindle. The acceptable range for Code is 100-199.
Name - The Name is a unique value to describe the spindle. The Name will be displayed in the Spindle field. The
Name can be comprised of alpha and/or numeric characters. Note - Touching the Name box will change the keypad
from numeric to alpha.
SMC – The SMC (Spindle Multiplier Constant) is used to convert the measured torque to viscosity. The acceptable
range of SMC is 0.001 – 500.
The SMC value can be determined through the use of the Range equation found in appendix C. Some
experimentation with the spindle and a calibrated viscosity standard is required.
Range (cP) = TK * SMC * 10,000/RPM
The Torque Constant (TK) can be found in Table D-2 in Appendix C.
SRC - The SRC (Shear Rate Constant) is used to convert the set RPM to shear rate and calculate Shear Stress. The
acceptable range of SRC is 0.001 – 500.
The SRC value can be determined if the shear rate characteristics of the spindle geometry are known. Consult the
Ametek Brookfield publication, “More Solutions to Sticky Problems”, for a discussion about shear rate and some
recommended equations. Shear Rate (1/s) = SRC * RPM
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