Brookfield R/S Coaxial Cylinder Rheometer - Manual (Page 7)

Brookfi eld Engineering Labs., Inc. Page 7 Manual No. M08-219-B1211
I. General Description
This section has general information about the instrument and operating principles.
I.1 Use of the Rheometer
The R/S+ Rheometer will measure viscosity of Newtonian and Non-Newtonian materials in
controlled shear rate (CSR) or controlled shear stress (CSS) modes. The instrument can measure
simple viscosity at a given speed or shear rate, or measure fl ow properties with a fl ow curve at
shear rates up to ~1,200 sec
-1 .
In controlled stress mode, the instrument can do a direct yield test (stress ramp) and indicate
elasticity with creep/recovery tests.
I.2 Measuring Principle
The R/S+ Rheometer is a rotational, controlled shear stress instrument which can be operated in
controlled shear rate mode.
Concentric cylinders, measuring cones and plates are available as a measuring system. The
measuring sample is positioned in a 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 precision, dynamic drive
system with optical encoder for absolute position measurement of spindle geometry.
The R/S+ measuring drive can operate at a pre-set of speed (shear rate) or pre-set of torque (shear
stress). Measurements may be made in manual mode (without PC) or under PC control with Rheo
3000 software. Note that the creep measurements require a computer system with Rheo 3000
software.
Both CSR and CSS measurements can be carried out manually (without PC support) or with a
computer system and Rheo 3000 software.