Kjel­Master K-375 & Kjel­Sampler K-376 / K-377

Free choice of methods at perfect usability

Perform potentiometric and colorimetric titrations with the KjelMaster K-375 and a free choice of methods at perfect usability. Gain high throughput, more automation and sophisticated data management for convenient nitrogen and protein analysis.

  • Adjustable Steam Power:Yes, 30 – 100%
  • Autosampler:Yes, either 24 or 48 sample positions
  • Sample Parameters:Total Kjeldahl Nitrogen, Total Volatile Basic Nitrogen, nitrate, nitrite
KjelMaster K-375 & KjelSampler K-376 / K-377


Operate your KjelMaster K-375 without being physically present. High-throughput processing of up to 48 samples is possible with KjelMaster K-377 or up to 24 samples with KjelMaster K-376. Enjoy high automation levels with perfect process synchronization of all steps from digestion to automated sampling. Use two independent racks with KjelMaster K-377 to achieve a continuous batch workflow.



The KjelMaster K-375 & KjelSampler K-376 / K-377 is the smallest bench top system available, giving you more flexibility in how you use your lab space. Prioritize the most important samples with the "express rack" for a highly efficient workflow. Choose between automatic or manual operation at any time to suit your changing needs. The system is compatible with all BUCHI sample tubes (100 mL, 300 mL, 500 mL) and offers free choice of methods at perfect usability.


Convenient and safe

With the KjelMaster K-375 & KjelSampler K-376 / K-377, there is no sample tube cleaning or glass transfer necessary, saving you time and ensuring your process remains clean and reliable. All handling of reagents is automated, eliminating any contact between you and harmful chemicals. Load your sample rack safely and smoothly at any time for a comfortable user experience. Finally, extend the lifetime of your glassware and save costs thanks to reduced exposure to chemicals.

Convenient and safe


  • Benefit from convenient system operation with an intuitive and easy-to-use touch screen feature.

  • Synchronized process from sample preparation to titration. With

    • balances, bar code reader
    • printer or network printer
    • KjelLink, LIMS
    • KjelSampler K-376 or K-377
    • Recirculating Chiller F-314 
  • The KjelLink PC software is a useful supplement for advanced programming and bidirectional data exchange.

  • The KjelMaster allows both potentiometric and colorimetric titration to achieve compliance without exception 

  • “IntelliDist” allows for reproducible results and saves time.

    • Automatic detection of the operating temperature
    • Shorter time-to-result thanks to less preparatory steps (e.g. no preheating) 

Compare the KjelMaster K-375 & KjelSampler K-376 / K-377

  • KjelMaster K-375

    • Sampler System K-375/376

      • Sampler System K-375/377

        The highlight of BUCHI’s automated Kjeldahl system is the 48 position autosampler that allows us to work in a continuous way and thus frees up a lot of time.M. Piedor, Laboratory Manager - CAE Grand Ouest, France


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        From milling to analysis

        For more than 50 years BUCHI has been developing outstanding solutions for the determination of Kjeldahl nitrogen and steam-volatile analytes. It is our utmost ambition to understand and meet your personal demands. Our solutions include innovative products for the entire process workflow, bespoke application support, sophisticated data management and professional maintenance. Thousands of satisfied customers all over the world in quality control and R&D laboratories enjoy our comprehensive approach.
        • Food

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

        • Beverage

          Protein, organic nitrogen, ammonia, nitrate, nitrite (Devarda)

        • Chemicals

          Total Kjeldahl Nitrogen (TKN), ammonia, nitrate, nitrite (Devarda)

        • Environmental Analysis

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

          Environmental Analysis
        • Pharmaceutical / Cosmetics

          Organic nitrogen, peptides, ammonia, urea

          Pharmaceutical / Cosmetics