Anton Paar Gmbh

Peter Kraxner

Rupert Gruellenberger

Harald Schmidegg

Rudolf Reiter

Ulf Panitzki

A rotational viscometer for measuring a viscosity of substances contains a measuring shaft and a hollow shaft which is driven by a drive. The measuring shaft is arranged within the hollow shaft. A measuring body is arranged at one end of the measuring shaft and can be supplied with a sample. A coupling element is provided for connecting the hollow shaft to the measuring shaft. An angle measuring unit is arranged relative to the measuring shaft such that an angular difference and/or a rotational phase difference between the hollow shaft and the measuring shaft can be measured. The hollow shaft and the measuring shaft end opposite the measuring body and protrude into a housing. The coupling element is arranged in the housing, and the housing and the coupling element are connected to the measuring shaft and to the hollow shaft such that the housing is removable from the rotational viscometer.

Rotational viscometer for measuring the viscosity of substances

A method for determining the viscosity of materials uses a rotation viscosimeter having a measuring shaft connected through a coupling element to a drive and a measuring element on a shaft end applied to a sample. An angle measuring unit measures an angle deflection between drive and shaft. The measuring element is immersed in a measuring container containing the sample. The rotational speed of the shaft increases from a first measuring point at an initial speed in steps to further measuring points and the angle deflection between the drive and the shaft is determined in the measuring points. An estimation function is determined for the rotational speed and the angle deflection for the sample using measured values in the measuring points. An optimum rotational speed is determined based on the estimation function of a previously defined optimum angle deflection and the viscosity measurement of the sample is carried out.

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Fernitz-Mellach, Austria

Peter Kraxner