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Foss™ Kjeldahl Digestion Systems

Digestion units can be combined with a range of accessories to match individual needs. Auto models come include integrated programmable controllers.

Supplier:  Foss™ 60080235

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Catalog No. TC2508052

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Includes: Digestion unit, tube rack with integrated heat shields. Auto lift models include lift and integrated controller, auto rack models include rack and integrated controller
This item is not returnable. View return policy



Choose from basic units capable of handling just a few samples a day to fully automated systems for high sample throughput.


  • Economy of chemicals, energy, labor, space and time
  • Efficient fume containment through optional exhaust manifold
  • Efficient fume removal through optional scrubber
  • Systems are compatible with Kjeltec™ Distilling Units
Standard Features
  • Three configurations available: auto lift, auto rack, and basic
  • System consists of a digestion unit and tube rack with capacity for either eight or twenty tubes
  • Audible “ready” or “cycle over” alerts advise user when digestion application is completed
  • Audible “alarm” alerts advise user when errors/interruptions occur within running application program
  • Unit is insulated to minimize heat transfer to the surroundings and allow fast, even heating
  • Auto versions have an integrated all-activity controller that is programmable using supplied software Auto models can be connected to a PC for datalogging and downloading of standard, user-defined applications

Basic Model

  • Temperature and time for digestion are selected on front panel; all other procedures are performed manually
  • Can be fitted with rack system at any time to save fume hood space
  • Cannot be upgraded to Auto model
Auto Lift Models
  • Fully automated digestion with user interface adapting to actual product configuration
  • GLP-support through two-way PC communication
  • Auto Lift models, with exhaust docking facility, allow fully automated unattended operation
  • Facilitate highly automated procedures, eliminating heavy and risky handling of hot chemicals; save fume hood space
  • When lift or scrubber unit is connected, they are controlled by the selected application program
  • Exhaust manifold docks automatically with the tube rack as the tubes move down into the preheated digestion unit; scrubber unit, if connected, starts
  • Scrubber capacity is automatically adjusted to contain fumes and minimize acid losses
  • When digestion is completed, the combined tube rack and exhaust manifold move to the cooling position with scrubber unit still running until no further fumes are evolved
  • Audible signal indicates “cycle over”
  • To avoid spillage, a drip tray is inserted under exhaust manifold after cooling
Auto Rack Models
  • Allow automated digestions but require manual placement of tube rack and exhaust manifold which are stored above the digestion unit
  • Can be upgraded to Auto Lift systems
Software for Auto Systems
  • Preinstalled software system controls all necessary functions of the unit
  • Additional PC application software has two-way communication with Digestion Unit via serial RS-232 cable (supplied)

For reflux chemistries, such as Chemical Oxygen Demand (COD), a reflux head connected to a cold water supply should be used in place of the exhaust manifold. For Kjeldahl digestions, the Scrubber Unit (TC2501-001) should be considered for neutralization of corrosive gases; this replaces the water aspirator. For most Kjeldahl digestions, straight 250mL tubes are recommended.



Automated Digestion System
230 V
8 tubes
1 Ea.
50/60 Hz
230 V, 50/60 Hz
Digestion unit, tube rack with integrated heat shields, auto lift models include lift and integrated controller, auto rack models include rack and integrated controller


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