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Brookfield Engineering Labs., Inc. Page 5 M/02-212
I. General Description
In this chapter you get general information concerning use and measurement principle of your R/S
Rheometer.
I.1 Use of the Rheometer
The R/S Rheometer system provides possibility of Newtonian fluids viscosity measurements, recording
of flow curves as well as determination of viscosity functions of non-Newtonian fluids in steady shear
flows. Furthermore, it assures carrying out of measurements in non-stationary shear flows and the
measurements of viscoelastic substances values in creep processes. The R/S Rheometer is used in
quality control, production control and researches
I.2 Measuring Principle
The R/S Rheometer is a rotational-shear rate /shear stress-rheometer.
Concentric cylinders, measuring cones and plates are available as measuring system. The measuring-
sample is positioned in measuring gap between the stationary measuring cup and the rotating
measuring bob (Searle-principle), respectively between the rotating cone or plate and the stationary
lower plate (cone/plate-, cone/cone-measuring-system).
The measuring drive developed for this instrument operates with a high dynamic precision-drive-
system with optical encoder without gearing and without mechanical force transducers, so torque is
measured without deflection.
The R/S Rheometer measuring drive is applicable for carrying out rotational measurements with pre-set
of speed (shear rate) and pre-set of torque (shear stress).
In case of shear rate pre-set the torque acting on rotating measuring bob/cone/plate by measuring
substance flow resistance is measured (shear stress is measured).
In case of shear stress pre-set resulting speed of rotating measuring bob/cone/plate is measured (shear
rate).
Shear stress measurements can be carried out with R/S Rheometer in order to determine flow behavior
of plastic substances and enables exact measurement of yield point without shearing the measuring
substance.
The types of measurements
- rotation measurement with controlled shear rate (CSR)
- rotation measurement with controlled shear stress (CSS)
can be carried out in manual (without PC support) or in connection with a computer system with the
software RHEO 2000.
The creep measurements requires computer system with software RHEO 2000.