Brookfield DV2T Viscometer - Manual (Page 48)

Brookfield Engineering Labs., Inc. Page 48 Manual No. M13-167-B0614
A Special Spindle is created by selecting the Special Spindle command button
in the Edit Spindle List menu. A Special Spindle requires a code, a name,
and an SMC value. Optional values include SRC and YMC.
Code
The code is the numerical value used to select the spindle. This
value must be unique and can not 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 numeric characters.
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 D. 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 D.
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 Brookfield publication,
“More Solutions to Sticky Problems”, for a discussion about shear
rate and some recommended equations.
Shear Rate (1/s) = SRC * RPM
YMC The YMC (Yield Multiplier Constant) is used to convert the measured
torque to yield stress.
This feature is only available with the DV3T Rheometer. Consult
the DV3T operating instructions for more information.
Speed List:
The selection of Speed in Configure Viscosity Test can be done by using either
a number pad or a scroll list. (This choice is selected through the navigation
button in the Set Spindle screen.) When scroll list is selected, the speed
entry is restricted to the classic Brookfield speed sets for the LV and RV/HA/
HB viscometers. The contents of the scroll list are defined in the Speed List
menu. Each speed can be individually selected or deselected through the use
of a check box. Select or deselect all speeds by using the Select All check
box. Select or deselect all LV (or RV/HA/HB) speeds by using the Select All
LV check box. The classic Brookfield speed sets are defined below.
LV: 0.3, 0.6, 1.5, 3, 6, 12, 30, 60
RV/HA/HB: 0.5, 1.0, 2.0, 2.5, 4, 5, 10, 20, 50, 100
Additionally, a new speed can be added to the list by selecting the New Speed
command key at the bottom of the display. The New Speed must be selected
within the range of available speeds on the DV2T: 0.0 – 200 RPM.
Speed entry through the number pad is never restricted.
TIP: To ensure that the correct speed is always entered, create a test that
is saved to the DV2T memory.