SpeedDigester K-425 / K-436

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Set new standards in terms of digestion speed, flexible use and result reproducibility with the IR SpeedDigester. Achieve an increased sample throughput for nitrogen determination by Kjeldahl digestion and multiply instrument functionality whenever needs are changing.

High speed and throughput

  • Fast heat transfer of infrared heaters to samples.
  • Large time savings due to fast heating and cooling.
  • Increased sample throughput due to shortened process time.
  • Accelerated digestion step with continuous addition of H2O2.


  • One instrument for both Kjeldahl and reflux digestion.
  • All BUCHI sample tubes to be used (100 mL, 300 mL, 500 mL).
  • Sample tubes compliant with ISO 6060 for COD or other reflux digestion.
  • Dedicated suction module for aqueous samples.


  • Sealed suction module for effective transfer of harmful fumes.
  • Effective neutralization of fumes by the Scrubber K-415.
  • Safe operation and extended lifetime of fume hood.