Measuring Viscosity of Liquids with the EMS Viscometer

The Electromagnetically Spinning (EMS) Viscometer is a rotational viscometer (sometimes called a viscosimeter) that measures the viscosity of liquids by observing the rotation of a sphere, which been driven by electromagnetic interaction.

This new measuring principle was developed by Sakai et al. at the Tokyo University.

The EMS technology is unique compared to other rotational viscometers due to the following characteristics:

  • All components of the viscometer that come in direct contact with the sample are disposable and inexpensive
  • All sample measurements are performed in a sealed sample vessel
  • The system requires only very small sample quantities (0.3 mL)
  • Temperatures within the range of 0-200 °C can be explored
  • Measurements can be carried out quickly and reliably, which can take less than 5 seconds


  • Concentration series - it is possible to determine the concentration dependence of the viscosity by diluting the same sample up to 26 times.
  • Volatile and toxic samples - due to its sealed cuvettes, it is possible to measure the viscosity of toxic materials or monitor the viscosity of samples during a long period of time and/or at elevated temperatures without measuring errors caused by evaporation.
  • No cleaning required - the perfect solution for samples which are only available in small quantities.
  • Melt viscosity and thermosetting materials - the EMS Viscometer is the perfect solution for viscosity measurements of samples like adhesives or to perform studies of viscosity changes of polymer solutions during polymerizations: no cleaning required after measurement.
  • Controlled atmosphere measurements - monitor the viscosity during chemical reactions which must be carried out under inert gas or overpressure conditions.

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