BLT-5500 Bleach Load Transmitter

One sensor measures the lignin content of both the fiber and filtrate


  1. Key parameter in fiberline operations control
  2. Improve brown stock washing
  3. Enhanced oxygen delignification and D0 operations
  4. Reduce chemical costs
  5. Lower energy costs in evaporation plant

BLT-5500: Bleach load

Bleach Load Transmitter

The purpose of the BLT is to measure the total bleach load, or chemical demand of the pulp stream going into the bleach plant stages. The BLT uses UV-VIS light sources to measure both the fiber lignin and the lignin dissolved in the liquid phase of the pulp stream. The BLT provides an in-line continuous measurement of the total lignin content of the pulp stream thus giving the total blech load of the pulp. Furthermore, the BLT is simultaneously measuring the pulp brightness. Using the multiple light sources, it is also possible to calibrate the BLT to measure the conventional fiber kappa number provided that the pulp is well washed.


Neither the standard laboratory kappa test nor the result from a traditional online kappa analyzer addresses any lignin carry over in the filtrate coming with pulp stream. The ability to measure total bleach load allows for a more accurate control of the chemical charge thus reducing the cost for chemical without risking low brightness pulp.

BLT 5500 model image

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Value added services

  • BTG’s Mütek lab devices create cost savings through optimized chemical dosage and reliable, stable operation
  • A new, fast and accurate method to optimize polymer dosage for dewatering processes in ‘ effluent treatment
  • BTG’s Mütek PCD opens up new options for measurement of grain products, raw materials, additives and finished products

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