Brookfield R/S CPS Rheometer - Manual (Page 5)

Brookfield Engineering Labs., Inc. Page 5 Manual No. M08-218-B0212
I. General Description
This section has general information about the instrument and operating principles.
I.1 Use of the Rheometer
The R/S-CPS+ Rheometer is used in quality control, product development and research. The
instrument measures Newtonian and non-Newtonian fluids, records flow curves and determines
the viscosity functions in steady shear flows.
I.2 Measuring Principle
The R/S CPS+ Rheometer is a rotational, controlled-stress rheometer. Measuring cones and
measuring plates follow DIN (the German industrial standards organization) specification 53018.
The measuring substance fills the gap between the bottom measuring plate of the instrument and
the rotating measuring element.
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 CPS+ Rheometer measuring drive may be used for rotation tests with pre-set speed (shear
rate) and measurement of the torque imposed on the measuring element or in shear stress test
with control of a pre-set shear stress, to measure the shear deformation of the measured substance
by angular deflection of the measuring element. When flow properties of plastic substances are
to be determined, the R/S CPS+ Rheometer can be used for shear stress tests that allow precise
measurement of the yield point without shearing the measured substance.
There are two measurement types:
• rotational measurement under controlled shear rate (CSR)
• rotational measurement under controlled shear stress (CSS)
Both CSR and CSS measurements can be carried out manually (without PC support) or with a
computer system and Rheo 3000 software.