Particle sizing during grinding prozess

Online particle size controller OPC


Online particle size controller OPC

Particle sizing during grinding prozess

180 mm
180 mm
110 mm
400 kg

Technical details
  • Online particle size analysis in full product flow
  • Integrated sampling with recirculation of the analyzed product
  • Continuous analysis possible
  • Evaluation and detection of screen breaks
  • Optimization of maintenance intervals due to grain size changes during operation
  • Can be operated with different recipes without the need for recalibration.
  • Own evaluation electronics with own small monitor in the local control box.


Machine types
Machine OPC
Analysis method optical
Measuring range (µm) 160 to 6000 µm
Power supply (V) 230 v
Signal input external start signal, LAN connection
Signal output 2 alarm values, fault message, LAN connection
Installation height (mm) 1100 mm
Depth (mm) 1430 mm
Width (mm) 330 mm
Diameter pipe section/flange (mm) 300 mm
Dimensions control cabinet (mm) 400 x 400 x 200 mm
Gear motor sampling screw (kW) 0,75 kW

Download data sheet
Tietjen’s solution for hammer mills

Particle size measurement


The Online Particle Size Controller OPC is a measuring device for the continuous determination of the particle size of free-flowing bulk materials of all kinds.

The OPC is integrated directly into the grinding process of the hammer mill. Regrind is fed into the OPC via a bypass and the particle size is determined there using a camera. The measurement data is then evaluated in the OPC software, which is available in several languages. If the particle size deviates from the previously defined specification or if there is a screen break, the OPC software informs the operator.

Grinding module
Grinding module with particle size controller

This automated and integrated measuring process increases throughput because the grinding process does not have to be interrupted during the analysis. Due to the continuous analysis, the quality of the ground material is also improved.

Effective monitoring of the grinding process

Your Advantages

Effective monitoring of the grinding process

  • Detection of screen breakages or damages in the mill
  • Detection of wear on beaters and screens
  • Output of two individually definable alarm values in the case of  deviations from the target particle size distribution, e.g. if the  proportion of coarse or fine particles is too high
  • Real-time measurement for immediate reaction

Increase of the plant availability

  • Optimisation of maintenance intervals due to particle size changes during operation
  • Predictive maintenance of the mill possible

Suitable for many applications

  • For free-flowing bulk materials of all kinds
  • Purge air connection for cleaning, can also be used for greasy  and sticky products
  • Return of the analysed sample into the process or discharge  for traceability possible
  • No recalibration required when changing products or formulations

Simple integration into the grinding system

  • Can be integrated into both new and existing systems
  • Simple connection in a vertical pipe via flared flange
  • Evaluation via own electronics
  • Full operability via web interface
  • Integration into the process control system possible
Each system is different
Diverse applications in dry grinding require individual solutions
Our product
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