Brookeld Engineering Labs., Inc. Page 18 Manual No. M02-313E1209
Table III-2: Full Scale Range Viscosity for High Torque CAP 2000+
Cone
Number
Cone
Range
Constant
Shear Rate
Constant
FSR Poise
at 100
RPM
FSR
Poise at
750 RPM
FSR Poise
at 900
RPM
Poise at any RPM
01
1875 13.33N
18.75
2.50 2.08
1875/N
02
3750 13.33N
37.50
5.00 4.17
3750/N
03
7500 13.33N
75.00
10.00 8.33
7500/N
04
15000 3.33N
150.00
20.00 16.67
15,000/N
05
30000 3.33N
300.00
40.00 33.33
30000/N
06
75000 3.33N
750.00
100.00 83.33
75000/N
07
3150 2N ‡
‡ ‡
3150/N
08
12500 2N ‡
‡ ‡
12500/N
09
50000 2N ‡
‡ ‡
50000/N
10
5000 5N
50.00
6.67 5.56
5000/N
N= RPM
Poise x 100 = centiPoise
‡Use of this cone at these RPM is not recommended
You can also determine FSR for any speed selection that is not in the above tables by doing a
simple calculation:
• For Low Torque CAP instruments:
Cone range constant / (22.7 * N) = FSR (Poise) where N = RPM
• For High Torque CAP instruments:
Cone range constant / N = FSR (Poise) where N = RPM
The last column in the above tables shows this calculation.
III.2 Accuracy of Viscosity and Temperature
The following tables indicate the accuracy of the viscosity measurement for the CAP 2000+
Viscometer using CAP spindles 01-10. This accuracy depends on both the rotational speed of the
cone and the percent of Full Scale Range (%FSR) in Poise at which the viscosity is measured.
Accuracy is stated in Poise (P) and is calculated as a % of the FSR viscosity.
To calculate accuracy:
• Determine FSR viscosity in Poise for the torque model, cone spindle, and speed of rotation,
using the information in Tables III-1 or III-2.
• Find the column that best denes the speed of rotation used for the measurement and your
reported % FSR from the measurement.
• Consult the table below to determine the accuracy of your measurement
• Multiply the accuracy by the FSR viscosity if you need your accuracy stated in Poise.
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