Measuring °Brix and concentration in the crystallizer

Controlling the boiling process in vacuum pans is one of the most important and critical activities in the sugar production process. High accuracy is required to determine the seeding point to insure proper crystal structure and size of the product. The thick juice is heated in the crystallization process under vacuum conditions. When a certain concentration is reached, the juice is seeded with tiny sugar crystals to promote the growth of uniform crystals. With the microwave measuring systems from Berthold, the juice concentration (°Brix) is monitored throughout the crystallization process, and a precise determination of the seeding point can be determined. The Berthold LB 565 MicroPolar Brix is the ideal solution for providing a highly accurate and reproducible measurement. The brix measuring systems are applied in all crystallization stages. Due to its robustness and superior sensor flushing, the measuring systems have proven time and time again that they work reliably and trouble-free even in continuous operating conditions. Even after the final crystallization stage, the °Brix concentration of the massecuite can still be reliably measured at the outlet pipe, after the product has passed through the pump.

Customer benefits

  • Very precise determination of the seeding point
  • Uniform sugar crystals and improved quality
  • Reliable control during whole crystallization process
  • Continuous production, without process downtime
  • Pt100 for temperature compensation to achieve accurate measurements
  • Integrated reference line for disturbance-free measurement
  • Optional flushing of probe with low water consumption



Technical Features

  • Installation in batch pans or vertical vacuum pans VKT (continuous operation)
  • Side or bottom installation of container probe in crystallizer tanks, compartments or outlet pipe
  • High resolution through focused measurement signal
  • Integrated temperature control for operation in batch process
  • Easy to calibrate and maintenance-free system
  • Robust sensor elements with integrated flushing, ideal for continuous processes

Measuring principle

The MicroPolar measuring system uses the special dielectric property of water. It generates microwaves that interact with the water molecules. This interaction induces a weakening of the microwave energy, which can be detected as phase shift and attenuation. As the phase shift and attenuation change is directly proportional to the water content, this allows the determination of the concentration of the medium with high accuracy. Berthold‘s superior multi-frequency technology guarantees highly stable and reliable measurements that are unaffected by interferences caused by reflections or resonances. The microwave power of a MicroPolar system is so low (max. 10 mW) that the material to be measured is neither heated nor changed in any way.


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Berthold's Measurement Solution

MicroPolar Brix LB 565

Measurement of Brix, dry substance, density, and concentration with Micro-Polar Brix – the microwave analyser for the sugar industry