DRT-5500 Freeness Inline

DRT-5500 Freeness Inline

Inline measurement of pulp drainage directly from the process line and output in freeness.

The DRT-5500 analyzer measures drainage of pulp suspension. By taking consistency and temperature into account, freeness results are provided. Its sampling device extracts the pulp directly from the process line usually right after a refiner. Due to the unique measuring principle of the DRT-5500, measurements are automatically compensated for consistency and temperature variations.

  • Allows fast response to process variations
  • Saves energy through optimized refining and drainage
  • Allows closed loop refiner control
  • Low investments and lifecycle costs

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  • Suitable for all pulp types to monitor refining processes in regard to the used raw materials and operation of refiners
  • Optimization of refining and drainage saves energy costs
  • Closed loop refiner control
  • Depending on the used raw materials, two versions for consistency measurement are available (LED or patented Peak method)


The instrument is intended for installations into pulp- and papermaking process lines and connection together with a base unit, which is a communication platform with a valve block for air and water. It is rated for voltages of 100 – 240 VAC at 50 Hz / 60 Hz.

Measuring range
Drainage rate measurement for 750 – 15 ml CSF or 15 – 90 °SR

Wetted parts are made out of stainless steel, EN 1.4404

Pressure maximum 6 bar (90 psi)
Ambient temperature max.50°C [122°F]
Min. pipe diameter 100 nm


  • Temperature max. 80°C (176 °F)
  • Consistency 1 – 6%
  • Filler content 0 – 20%
  • Flow velocity 0.3 – 2 m/s

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