BÜCHI Labortechnik AG

- Model K-375 - Nitrogen and Protein Analysis System



We provide solutions for both potentiometric and colorimetric titrations. The KjelMaster K-375 meets the highest demands in usability, automation, user administration and sophisticated data management.

Comprehensively safe

  • Compliant and flexible plug-and-measure titration concept (colorimetric / potentiometric)
  • Safe operation, user protection and guided routine operation
  • Different access levels of authorization according to GLP requirements
  • Reproducible results with the smart distillation mode “IntelliDist”
  • Data security supported by intelligent software

Safe and convenient

  • Intuitive operation via the large graphical color touch screen (8.4”)
  • Simple LIMS integration and traceable data recording
  • No errors in routine operations by the sophisticated KjelLink PC software
  • Optimal and stable working conditions by self-adjusting cooling water control


  • Shortest time-to-result due to well synchronized process steps
  • Upgrade onsite for highest sample loads by connecting the KjelSampler
  • Fully automated workflow for high sample loads
  • Automatic data exchange with complementary peripherals

Feed - Kjeldahl

Protein, Non-Protein Nitrogen (NPN)

Food - KjelMaster

Protein, Non-Protein Nitrogen (NPN), casein (NCN), Total Volatile Basic Nitrogen (TVBN), formaldehyde

Beverage - KjelMaster

Protein, alcohol, volatile acids, diacetyl

Chemicals / Agricultural - KjelMaster

Ammonia, nitrate, nitrite (Devarda), total nitrogen

Environmental Analysis - Distillation

Ammonia, Total Kjeldahl Nitrogen (TKN), phenol, formaldehyde, nitrate, nitrite (Devarda)

Pharmaceutical / Cosmetics - Distillation

Organic nitrogen, ammonia, urea, formaldehyde

Glass splash protector

With its extensive know-how BUCHI provides state-of-the-art glass parts like the splash protector. The whole distillation process is visible for easy method development and process monitoring.

Plastic splash protector

This splash protector is made of glass fiber reinforced polypropylene. It is the choice for high throughput analysis due to its long lifetime.

Potentiometric electrode