Abstract: A rheometer has rotary rheometer and a linear DM(T)A analysis unit. A measuring shaft of the rotary rheometer carries a measuring part that faces a measuring part carried on an adjusting rod of the linear analysis unit. The sample under test is placed in a measuring gap between the measuring parts. The DM(T)A analysis unit has a linear motor, in particular magnetically operated, with a stator and a slider, and a magnetically-operated gravitational compensation unit, by way of which it is possible to compensate for the weight force of the adjusting rod, the measuring part on the adjusting rod, the slider, and any optional the components fastened to the slider.

Abstract: A rheometer has rotary rheometer and a linear DM(T)A analysis unit. A measuring shaft of the rotary rheometer carries a measuring part that faces a measuring part carried on an adjusting rod of the linear analysis unit. The sample under test is placed in a measuring gap between the measuring parts. The DM(T)A analysis unit has a linear motor, in particular magnetically operated, with a stator and a slider, and a magnetically-operated gravitational compensation unit, by way of which it is possible to compensate for the weight force of the adjusting rod, the measuring part on the adjusting rod, the slider, and any optional the components fastened to the slider.

Abstract: A rotational rheometer for measuring powdery or granular materials has a measuring container for receiving the product to be measured and a cover for the measuring container. A measuring body is held by a measuring shaft. The measuring body and the container are rotatable relative to one another. The measuring shaft is guided through the cover with low friction, or without contact altogether. An evaluation unit is arranged outside the measurement container to evaluate the measured values received by the measuring shaft. To seal the bearing gap or the passage of the measuring shaft in or through the cover in the measuring container, both a fluid seal with a sealing fluid inlet and at least a geometric seal cooperating with the fluid seal are provided as a powder barrier.

Abstract: A rotational rheometer for measuring powdery or granular materials has a measuring container for receiving the product to be measured and a cover for the measuring container. A measuring body is held by a measuring shaft. The measuring body and the container are rotatable relative to one another. The measuring shaft is guided through the cover with low friction, or without contact altogether. An evaluation unit is arranged outside the measurement container to evaluate the measured values received by the measuring shaft. To seal the bearing gap or the passage of the measuring shaft in or through the cover in the measuring container, both a fluid seal with a sealing fluid inlet and at least a geometric seal cooperating with the fluid seal are provided as a powder barrier.