Glossary
G-3
Spindle
The cylindrical object which is rotated in the fluid by the viscometer. Its
motion in the fluid causes a resistance called viscous drag which is
measured by the instrument as % torque. Its rotation causes fluid shearing
to occur.
Turbulent Flow
Flow which occurs when fluid moves randomly with respect to other
elements of fluid, with mixing between elements.
Viscous Drag
The resistance to rotation produced by an object such as a spindle when it
is rotated in a fluid.
Viscosity
A measure of the internal resistance within a fluid to resist flow.
Mathematically defined as shear stress divided by shear rate. Sometimes
called absolute viscosity.
4-20 mA Signal
The continuous electrical output produced by a viscometer which is
proportional to the % torque being measured and also proportional to the
scale. For Brookfield Process Viscometers, 4 mA = 0 cP, 12 mA = half of
full scale, and 20 mA = full scale, linear between 0cP and full scale.
% Torque
Brookfield Process Viscometers function as a rotating torque meter, whose
response is linear with respect to viscosity. A % torque measurement
displays the proportion of full scale which a measured fluid produces. This
factor is applied to full scale in order to give a measurement in engineering
units.
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