OfiTE 800 - Page 7

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Shear Rate Range R1B1 R1B2 R1B3 R1B4 R1B5
Shear Rate Constant, K
R
,
(sec
-1
per RPM)
1.7023 0.3770 0.2682 0.2682 0.8503
Shear Rate, (sec
-1
or 1/s)
3 RPM
5.11 1.13 0.80 0.80 2.56
6 RPM 10.21 2.26 1.61 1.61 5.11
30 RPM 51.07 11.31 8.05 8.05 25.54
60 RPM 102.14 22.62 16.09 16.09 51.07
100 RPM 170.23 37.70 26.82 26.82 85.12
200 RPM 340.46 75.40 53.64 53.64 170.23
300 RPM 510.69 113.10 80.46 80.46 255.35
600 RPM 1021.38 226.20 160.92 160.92 510.69
Viscosity Ranges
<a>
(cP)
R1B1 R1B2 R1B3 R1B4 R1B5
Minimum Viscosity
<b>
@600 RPM
0.5
<c>
4.5 12.7 25 1.2
Maximum Viscosity
<d>
@3 RPM
33,000 293,920 838,200 1,672,000 38,390
<a> Computed for standard Torsion Spring (F 1.0). For other torsion springs, multiply by F factor.
<b> Lower viscosities can be measured by the Model 800, however one must take into account the
e󰀨ect of bearing drag, Taylor vortices, zero o󰀨set, etc. when looking at the expected accuracy of the
reading.
<c> For practical purposes the minimum viscosity is limited to 0.5 cP due to Taylor Vortices.
<d> Maximum viscosity is based on Maximum Shear Stress and Minimum shear rate (RPM). However,
due to practical and physical limitations, it may be di󰀩cult to take these measurements.
Shear Stress 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 1 100 100 100 0.2088
g/(cm*s) 100 1 100 100 100 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