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.

Brookfield Engineering Labs., Inc.

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M/02-212

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IBM M/02-212 operating instructions General Description, Use of the Rheometer, Measuring Principle

M/02-212 specifications

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