Brookfield CAP2000 Viscometer - Manual (Page 18)

Brookfield Engineering Labs., Inc. Page 18 Manual No. M02-313-G0812
III. OPERATION
The CAP 2000+ Viscometer rotates a precisely machined cone spindle over a temperature
controlled plate shearing the test sample over a range of speeds from 5 to 1000 RPM. This
provides a comprehensive capability to analyze materials for viscosity behavior as a function
of both shear rate and temperature. Tests can be run in standalone mode or under PC control.
This chapter explains how to use the CAP 2000+ toward these objectives.
III.1 Full Scale Range and Accuracy of Measurement
Full Scale Range (FSR) viscosity is the maximum viscosity that can be measured and occurs
when the % torque is 100. Brookfield recommends that viscosity measurements be made be-
tween 10 and 100% torque.
There are two tables to consult for viscosity range information, depending on which torque
model viscometer you purchased. To determine which torque model you have, consult the se-
rial tag of your viscometer or the certificate of calibration that accompanied the instrument or
the display on power up.
23CAP 2000+ = Low Torque CAP 2000+ = High Torque
Full Scale Range (FSR) is based on the cone spindle your are using, the torque model of your
viscometer, and the speed of spindle rotation. The tables below provide information on FSR
by torque model for the most common factory set speeds:
Table III-1: Full Scale Range Viscosity for LOW TORQUE CAP 2000+ Viscometer
Cone
Number
Cone Constant
Range
Shear Rate
Constant
FSR Poise at
100 RPM
FSR Poise at
500 RPM
FSR Poise at
any RPM
01 1875 13.33N 0.83 0.17 1875/(22.7*N)
02 3750 13.33N 1.65 0.33 3750/(22.7*N)
03 7500 13.33N 3.30 0.66 7500/(22.7*N)
04 15000 3.33N 6.61 1.32 15000/(22.7*N)
05 30000 3.33N 13.22 2.64 30000/(22.7*N)
06 75000 3.33N 13.04 6.61 75000/(22.7*N)
07 3150 2N 1.39 0.28 3150/(22.7*N)
08 12500 2N 5.51 1.10 12500/(22.7*N)
09 50000 2N 22.03 4.41 50000/(22.7*N)
10 5000 5N 2.20 0.44 5000/(22.7*N)
N = RPM
Poise x 100 = centiPoise