Brookfield BF35 - Manual (Page 9)

Brookfield Engineering Labs., Inc. Page 9 Manual No. M13-10000
Shear Rate Range R1B1 R1B2 R1B3 R1B4
Shear Rate Constant, K
R
,
(sec -1 per RPM)
1.7023 0.3770 0.2682 0.2682
Shear Rate (sec-1 or 1/s)
3 RPM
5.11 1.13 0.80 0.80
6 RPM 10.21 2.26 1.61 1.61
30 RPM 51.07 11.31 8.05 8.05
60 RPM 102.14 22.62 16.09 16.09
100 RPM 170.23 37.70 26.82 26.82
200 RPM 340.46 75.40 53.64 53.64
300 RPM 510.69 113.10 80.46 80.46
600 RPM 1021.38 226.20 160.92 160.92
Viscosity Ranges R1B1 R1B2 R1B3 R1B4
Minimum Viscosity
@600 RPM
0.5 4.5 12.7 25
Maximum Viscosity
@0.01 RPM
10,000,000 89,000,000 255,000,000 500,000,000
Compute for standard Torsion Spring (F 1.0). For other torsion springs, multiply by F factor.
Lower viscosities can be measured by the Model 900, however one must take into account the
effect of bearing drag, Taylor vortices, zero offset, etc. when looking at the expected accuracy of
the reading.
For practical purposes, the minimum viscosity is limited to 0.5 cP due to Taylor vortices.
Maximum viscosity is based on Maximum Shear Stress and Minimum Shear Rate (RPM).
However, due to practical and physical limitations, it may be difficult to take these measurements.
Viscometer Conversions
To convert from units on left side to units on top, multiply by factor @ intercept
Centipoise (cP) Poise (P) g/(cm*s) (mN*s)m 2 mPa*s (lb*s) 100 ft 2
Centipoise (cP) 1 0.01 0.01 1 1 0.002088
Poise (P) 100 1 1 100 100 0.2088
g/(cm*s) 100 1 1 100 100 0.2088
(mN*s)m 2 1 0.01 0.01 1 1 0.002088
mPa*s 1 0.01 0.01 1 1 0.002088
(lb*s) 100 ft 2 478.93 4.789 4.789 478.93 478.93 1