ViscoPakt®-Torque Measurement Stirrers

The ViscoPakt®-rheo model family was developed for applications which demand an exact recording of the torque, viscosity or the dissipated power and a precise maintenance of the rotational speed. In addition, the devices provide increased precision in rotational speed regulation and torque measurement and extended functions.

The Advantages

  • System stirrer for automatic laboratory process plant
  • Detection of reaction phases
  • Recording of stirrer dissipation in the reaction calorimeter
  • Measurement of rheological material properties
  • Scale-up tests
  • Process monitoring
  • Powerful and compact
  • High measuring accuracy
  • High sensitivity
  • Robust measuring principle
  • Recording of rotational speed and torque
  • Large, continuous rotational speed range
  • Specifiable re-start response after power failure
  • Automatic correction of the zero torque
  • Adjustable soft start ramp
  • Rotational speed and torque limiting adjustable
  • Quick-release chuck
  • Silent, smooth running


The ViscoPakt®-mini-rheo-35 is a precision measuring stirrer with an especially compact construction. It is used where high torques must be generated in the narrowest of spaces. This occurs particularly in small reactor systems with a nominal volume of below 500 ml and, at the same time, many connecting pieces as may be used, for example, for parallel syntheses.

The ViscoPakt®-mini-rheo-35 is used, among other situations, in our LabKit and MultiLab parallel reactor systems.


The ViscoPakt®-rheo model series contains a precision torque measuring device. The zero torque which is dependent on the rotational speed is recorded in an automatic calibration process and is used for the correction of the torque signal. It is thus possible to determine the viscosity (by a calibration table) and other rheological parameters online.

Changes in rotational speed caused by load fluctuations are recorded by a digital rotational speed sensor and electronically controlled. The rotational speed can be given via the analogue input or the serial interface. The actual rotational speed and the torque are issued via the analogue outputs and the serial interface.