M21-400 REV.1.1 DVPLUS DIGITAL VISCOMETER - OPERATIONAL MANUAL
Table D-2 lists the model codes and spring torque constants for each Viscometer model.
Table D-2
Model TK Model Code on DVPlus Screen
DVPlusLV 0.09375 LV
DVPlusRV 1 RV
DVPlusHA 2 HA
DVPlusHB 8 HB
The full-scale viscosity range for any DVPlus model and spindle may be calculated using the equation:
Full-Scale Viscosity Range
Where:
TK = DVPlus Torque Constant from Table D-2
SMC = Spindle Multiplier Constant from Table D-1
The following equations can be used to calculate the strain data after each packet of data is obtained from the
DVPlus:
(Shear Stress (D/cm2)) = Viscosity (P) * Shear Rate (1/sec)
= TK * SMC * SRC * TORQ
The immersion mark selected aects the stress calculations. Ensure the selected immersion mark reflects the mark
in use.
Each spindle has a Yield Multiplier Constant (YMC) for stress calculations and a Spindle Multiplier Constant (SMC)
for calibration checks (see Appendix E) as shown in Table D-3. Spindle dimensions are also listed.
Table D-3
Spindle Entry Code YMC SMC Vane Length
Inches cm
Vane Diameter
Inches cm
V-71 71 0.5 2.62 2.708 6.878 1.354 3.439
V-72 72 2.0 11.1 1.706 4.333 0.853 2.167
V-73 73 10.0 53.5 0.998 2.535 0.499 1.267
V-74 74 100.0 543 0.463 1.176 0.232 0.589
V-75 75 40.0 213 0.632 1.61 0.316 0.803
Note: If secondary immersion mark is selected, the YMC value is doubled.
The full scale Yield Stress range for any DVPlus model and spindle may be calculated using the equation:
Full Scale Yield Stress Range (Pa) = TK x YMC x 10
Where:
TK = DVPlus Torque Constant from Table D-2
YMC = Yield Multiplier Constant from Table D-3
The following speeds are available for yield tests.
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