Measuring °Brix in the crystallizer

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. 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 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 entire 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




  • Side or bottom installation of container probe in crystallizers, chambers 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 antennas with easily replacable PEEK caps
  • Installation in batch pans or vertical vacuum pans VKT (continuous operation)

Measuring principle

Microwaves penetrate the material to be measured. The dielectric constant value of the material  determines the materials impact on the microwaves. The dielectric constant value of water is 20 times larger than most other materials. This results in a strong interaction of the microwaves with water, which is then measured as attenuation and phase shift.
Consequently, the water content can be determined very accurately. The multi-frequency technology used by Berthold guarantees very stable and reliable measurements, which remain unaffected by interfering reflections or resonances. The integrated reference line ensures reliable compensation for ambient influences. The MicroPolar works with very low microwave power (approx. 0.1 mW) meaning that the material being measured is not heated or altered in any way.


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