A rheometer includes a measuring shaft unit being rotatably mounted in a stationary support unit and having a measuring shaft carrying a measuring part. Transmitting units having optical transmitters are disposed on the support unit and receiving units having optical receivers are disposed on the measuring shaft unit for data transmission therebetween. A measuring sensor disposed on the measuring shaft detects at least one parameter. The transmitting and receiving units are disposed between the measuring shaft unit and the support unit and are associated with one another for exchanging data. The optical transmitters on the support unit transmit data and energy to the optical receivers on the measuring shaft unit. The transmitting units feed or transmit to the optical receivers at least energy required by the optical transmitters on the measuring shaft unit and the measuring sensor to output or transmit data to the optical receivers.

A rheometer includes a measuring shaft unit being rotatably mounted in a stationary support unit and having a measuring shaft carrying a measuring part. Transmitting units having optical transmitters are disposed on the support unit and receiving units having optical receivers are disposed on the measuring shaft unit for data transmission therebetween. A measuring sensor disposed on the measuring shaft detects at least one parameter. The transmitting and receiving units are disposed between the measuring shaft unit and the support unit and are associated with one another for exchanging data. The optical transmitters on the support unit transmit data and energy to the optical receivers on the measuring shaft unit. The transmitting units feed or transmit to the optical receivers at least energy required by the optical transmitters on the measuring shaft unit and the measuring sensor to output or transmit data to the optical receivers.

A viscometer has a hollow cylinder mounted in a base frame and rotated about its longitudinal axis. A measuring part being flowed through by a fluid to be tested is rotatably supported in the hollow cylinder. An electromagnetic drive with a stator and a rotor for the hollow cylinder is provided, with which the hollow cylinder is rotatable. The stator is supported on the base frame and the rotor is supported on the hollow cylinder. An electromagnetic coupling of the stator with the rotor is provided by a ring rotor disposed between the stator and the rotor. The ring rotor is mounted about the longitudinal axis of the hollow cylinder so that the base frame and the hollow cylinder are decoupled with respect to the electromagnetic drive and a torque by the electromagnetic drive is applied to the hollow cylinder while the acting forces on the hollow cylinder are minimized.

A device for removal of excess material from a test sample includes a test geometry comprising a lower geometry and an upper geometry, wherein at least one of the upper geometry and the lower geometry is configured to move vertically with respect to the other of the upper geometry and the lower geometry and a trimming device. The trimming device includes a first arm extending to a first set of blades including a first blade and a second blade, a second arm extending to a second set of blades including a third blade and a fourth blade, and linear track system. Movement of the trimming device along the linear track system first engages the first blade and the third blade with an exterior of at least one of the upper geometry and the lower geometry, and then engages the second blade and the fourth blade with the exterior of the at least one of the upper geometry and the lower geometry.