BÜCHI Labortechnik AG

Model K-439 - IR and Block Heating Digestion Systems



The SpeedDigester K-439 revolutionizes IR digestion. It combines the benefits of IR and block digestion in one unit. Fast digestion at controlled temperatures enables an increased sample throughput. Multiply the instrument functionality whenever needs are changing.

High speed and throughput

  • Fast heating and cooling results in large time savings
  • Increased sample throughput due to short process time
  • Accelerate the digestion with continuous addition of H2O2


  • One instrument for both Kjeldahl and reflux digestion
  • 100, 300 and 500 mL sample tubes for Kjeldahl
  • Sample tubes compliant with ISO 6060 for COD and other reflux digestions (e.g. aqua regia)
  • Optional dedicated suction module for aqueous samples

Excellent reproducibility

  • Accurate temperature control following the programmed profile
  • Storage of up to 50 different method profiles (time / temperature)
  • Digestion process shown graphically
  • Thermal homogeneity due to the innovative insulation plate

  • Heating principle : Radiation
  • Temperature control : Yes
  • Max. temperature : 580 °C 
  • Programmable profiles: Yes
  • Lift: No
  • Heating zone : 9 cm 
  • Sample positions : 6 / 12
  • Sample tube sizes : 100 / 300 / 500 mL 
  • Other sample tubes : Reflux sample tubes (e.g. COD) 3rd party tubes


Feed - Kjeldahl

Protein, Non-Protein Nitrogen (NPN).


Chemicals/Agricultural - Digestion

total nitrogen


Beverage - Digestion



Pharmaceutical / Cosmetics - Digestion

Organic nitrogen, urea.


Food - SpeedDigester

Protein, Non-Protein Nitrogen (NPN), casein (NCN), hydroxyproline.


Environmental Analysis - KjelDigester

Total Kjeldahl Nitrogen (TKN), phosphate.


Selection of sample tubes

The SpeedDigester can flexibly be adapted to use three different sample tube sizes: 100 mL, 300 mL and 500 mL


Suction module types

Specific suction modules are available for aqueous samples and accelerated digestion. The standard suction module is appropriate for most other applications.


Reflux setup (water cooled)

This setup guarantees efficient reflux without the loss of volatile compounds, the main use is for trace metal determination by aqua regia digestion.


COD setup (air cooled)

COD determination according to DIN 380 409 Part 41 and ISO 6060. Sample tubes are compatible with the autosampler from Mettler Toledo for automated COD analysis.

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