Online measurement to improve quality

Microwave measurement is nonintrusive; there is no sensor that comes into contact with the product to be measured, which limits maintenance and avoids special cleaning. The measurement is not influenced by the colour or inhomogeneity of the measured product. Furthermore, the measurement is carried out on the entire product. In addition, the multi-frequency technique enhance the stability and representativeness of the result. The Micro-Polar system is easy to install. The processing unit has a large display and a user-friendly interface. Automatic calibration can be carried out on site.

Microwave moisture measuring principle

The microwaves pass through the product to be measured, causing rotation of the free water molecules. They have excellent dielectric properties. This rotation causes the microwaves to slow down (phase shift) and decrease in amplitude (attenuation), resulting in a very accurate measurement of the water content. Thanks to the multi-frequency technique used by Berthold, the measurements are highly reliable and stable and are not affected by reflectance or resonance. The integrated reference line provides excellent compensation of the influence of environmental parameters. As the device generates very low power microwaves (about 0.1 mW), the measured product does not undergo any temperature rise or changes. The radio licenses for the system have been approved by the FCC, IC and ETSI.


  • As it is noncontact, it can be installed without interrupting operation
  • High availability and therefore high operational safety
  • Easy to install on existing conveyors


Customer benefits

  • Precise and maintenance-free operation
  • Measurement of the whole material profile
  • Reliable measurement without recalibration
  • Reduction of operating costs through effective use of the binding agent




Berthold's measurement solution

MicroPolar LB 567/568

Microwave moisture analysers for all kinds of bulk materials, non-contacting, reliable and maintenance free