Brookfield RST Rheometer - Manual (Page 4)

Brookfield Engineering Labs., Inc. page 4 Manual No. M14-223
I Introduction
I.1 Measuring Principle
The RST Rheometer is a rotational, controlled-stress rheometer. The measuring drive developed for this
instrument utilizes a high-precision dynamic drive system with optical encoder for absolute position
measurement of spindle geometry.
There are two basic measurement methods:
• rotational measurement under controlled shear rate (CSR)
• rotational measurement under controlled shear stress (CSS)
The RST Rheometer performs rotational tests with pre-set speed (shear rate) and measures the torque
imposed on the measuring element or in shear stress a pre-set shear stress to measure the shear
deformation of the measured substance by angular deflection of the measuring element. The RST
Rheometer can be used for shear stress tests that allow precise measurement of the yield point without
shearing the measured substance, as well as creep behavior and recovery after shearing.
Both CSR and CSS measurements can be carried out manually (without PC support) or with a
computer system and the Rheo3000 application software.
The RST Rheometer is used in quality control, product development and research.