Kjel Line

Meeting the highest demands in nitrogen determination

BUCHI’s latest steam distillation units are extremely accurate, ensure the sustainable use of resources and offer maximal safety during operation. The instruments have been designed to fit your individual needs and to enable the highest performance in the most convenient way.

  • Adjustable Steam Power:10 - 100 %, programmable steam ramps
  • MaxAccuracy Mode:Yes
  • Sample Parameters:Total Kjeldahl Nitrogen, Total Volatile Basic Nitrogen, nitrate, nitrite
Kjel Line

Experience Highest Convenience & Safety

  • Innovative sensor technology that minimizes exposure of the user to chemicals
  • Intuitive touch screen for easy process handling
  • Upgradeable on demand to automate your analysis in the most convenient way
Experience Highest Convenience & Safety

Maximize accuracy & performance

  • Automatic recognition of distillation start for perfect reproducibility
  • Distillation endpoint is recognized automatically for highest accuracy
  • Automated titration with connected titrators for minimum user interaction
Maximize accuracy & performance

Save Resources & Time

  • Optimized alkalization step for saving up to 30 % of reagent
  • Intelligent cooling water control for lower water consumption
  • No preheating required resulting in higher time-efficiency
  • Automated distillation & titration enables unattended operation
Save Resources & Time


  • For more convenience and easier sample handling, we offer configurations with sample tube and receiver waste aspiration. This saves time and allows for smooth operation of the instrument.

  • Thanks to the AutoDist function, measurements are unaffected by temperature differences within the device. This function recognizes the start of the condensation process and adjusts the distillation start time automatically in the individual measurement. This is achieved with a built-in temperature sensor within the condensate vessel and leads to more reproducible results.

  • Automated titration is key to achieving the highest performance possible in Kjeldahl protein determination. Titration dosage, as well as endpoint recognition via suitable electrodes, is carried out automatically. This allows for minimum user interaction and high throughput at the same time.

  • The cooling water control automatically saves water by intelligent flow limitation. Once steam distillation starts, water begins to flow through the condenser and the distillate is collected. Before and after distillation, the device automatically closes the cooling water valve. This feature saves approximately 20 % of water during determinations and eliminates concerns regarding the water supply.

  • The OnLevel sensor is available for all configurations where no titration vessel is mounted. The sensor stops the distillation automatically after a defined condensate volume is reached. The sensor can be easily set and adjusted manually via a magnetic backplate. Obtain reproducible condensate volumes independent of the system lifetime.

  • The reaction detection sensor is available for MultiKjel configurations. It can save up to 30 % of NaOH reagent solution for the alkalization process so that you can work more cost-efficiently and environmentally friendly.

  • With our versatile components, you can easily upgrade and automate your system for highest convenience. All parts can be chosen separately and can be combined one after another. The modular design allows you to achieve an optimal combination of features to suit your individual needs. In this way, you receive the optimum combination of features and peripherals according to your needs.

  • The intuitive touch screen provides fast feedback and enables easy process handling

  • Glass and plastic splash protectors are available. Glass splash protectors enable you to monitor the process to support method development and optimization. Plastic splash protectors are more robust and durable. Depending on the application, different splash protector variants enable the best performance

  • The Kjel Line instruments reduce user exposure to a minimum thanks to innovative sensor technology. Safety sensors monitor cooling water flow, steam generator pressure and if the sample tube is put correctly in place. Tank level sensors detect water, waste and reagent levels. The safety shields are fully transparent and equipped with secure control sensors. If the safety shields are opened during operation, the process is stopped automatically. The steam power is adjustable (10 - 100 %) and steam ramps are programmable to handle foaming samples.

  • In laboratories, deviations of the supply voltage are possible within a range of up to 10 % of the original value. This can potentially affect the steam power output. In order to avoid these deviations, a voltage stabilizer is integrated to maintain the required supply voltage. This enhances measurement accuracy and ensures highest reproducibility for every result.

Compare the Kjel Line

  • EasyKjel

    • Color display:Yes
    • Alkalization with NaOH pump:Yes
    • Dilution with water pump:No
    • AutoDist function:No
    • Sample disposal:No
    • Touch screen:No
    • Boric acid dosing:No
    • Receiving solution disposal:No
    • Titrator connection:No
    • Reaction detection sensor:No
  • BasicKjel

    • Color display:Yes
    • Alkalization with NaOH pump:Yes
    • Dilution with water pump:Yes
    • AutoDist function:Yes
    • Sample disposal:Optional
    • Touch screen:Optional
    • Boric acid dosing:No
    • Receiving solution disposal:No
    • Titrator connection:No
    • Reaction detection sensor:No
  • MultiKjel

    • Color display:Yes
    • Alkalization with NaOH pump:Yes
    • Dilution with water pump:Yes
    • AutoDist function:Yes
    • Sample disposal:Yes
    • Touch screen:Yes
    • Boric acid dosing:Yes
    • Receiving solution disposal:Optional
    • Titrator connection:Optional
    • Reaction detection sensor:Optional


Discover more documents


The best practice to analyze your samples

Any sample matrix, such as for Total Kjeldahl nitrogen (TKN), Total Volatile Basic Nitrogen (TVBN) or inorganic nitrogen (Devarda) is suitable for nitrogen analysis. Easily achieve compliance to specific norms and regulations for samples of your interest.
  • Feed / Agricultural Products

    Mixed and finished feed (ruminant, swine, poultry), ingredients such as oil seed meals, cereals, hulls & bran. Protein, Total Kjeldahl Nitrogen (TKN), Non-Protein Nitrogen (NPN) Protein: AOAC 2001.11 / 920.87 / 930.25 / 945.39 / 950.09 / 979.09 / 981.10 / ISO 1656 / 3188 / 20483

    Feed / Agricultural Products
  • Pharma / Biotechnology

    Pharma / BiotechnologyRaw materials, APIs, excipients, vaccines ointments, natural products, nutraceuticals, blood plasma products, toxins, cosmetics, biopharmaceuticals Ammonia, Total Kjeldahl Nitrogen (TKN), urea Ammonia, Total Kjeldahl Nitrogen (TKN), ureaNitrogen: USP 461 / Ph.Eur. 2.5.9. / AOAC 960.52 Protein: Ph.Eur. 2.5.33. Method 7.

    Pharma / Biotechnology
  • Environmental Samples

    Water samples, soil samples, waste water, fly ash Ammonia, Total Kjeldahl Nitrogen (TKN), nitrate/nitrite Nitrate/nitrite: DIN 38409 Part 28, DIN CEN/TS 15476 Nitrogen: DIN EN 13342 / 38409 Part 28

    Environmental Samples
  • Chemicals / Fertilizers

    Basic chemicals, petrochemicals and specialty chemicals, fertilizers, cosmetics, lubricant oils Ammonia, Total Kjeldahl Nitrogen (TKN), nitrate/nitrite Nitrate/nitrite: DIN 38409 Part 28, DIN CEN/TS 15476 Nitrogen: AOAC 955.04 / 981.10 / DIN EN 15750

    Chemicals / Fertilizers
  • Food / Beverages

    Cereals, dairy products, meat, pastry, seafood, ready meals, plant-based food Protein, Total Kjeldahl Nitrogen (TKN), Non-Protein Nitrogen (NPN), Total Volatile Basic Nitrogen (TVBN), casein, hydroxyproline Protein: AOAC 2001.11 / 920.53 / 920.87 / 925.31 / 928.08 / 930.25 / 950.48 / 979.09 / 981.10 / 991.20 / ISO 937 / 3188 / 8968-3

    Food / Beverages