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DK 20 Digestion Unit

Kjeldahl Digestion Units with 20-position aluminum heating block that offers an excellent thermal homogeneity. 
DK 20 F30100350
DK 20 F30150350

Thermal homogeneity and precision

Thermal homogeneity and precision
The DK 20 digestion unit with aluminium heating block ensures high thermal homogeneity heating up to 450 °C. The temperature of the block is constantly controlled by a microprocessor and is extremely stable, homogeneous and precise: 0.5°C. 

The DK 20 guarantees accuracy and repeatability. Program your methods with digestion time and up to 4 temperature ramps through the intuitive digital display. 

The DK 20 perform batch digestion of up to 20 samples with the following test tubes dimensions: 
  • DK 20 250 ml tubes - Ø 42 mm

Compact design and maintenance free

Compact design and maintenance free
DK 20 digestion units have very compact dimensions aimed to reduce the footprint and save space in your lab. The design of the heating block of VELP digestion unit has been studied in order to reduce space under the fume hood. 

The DK Series aluminum heating block does not require maintenance. It needs to be combined with a support system, sample rack (with heat shields), suction cap and test tubes (required accessories).

COD digestion with DK 20

COD digestion with DK 20
DK 20 is a versatile digester suitable for Kjeldahl N/Protein applications and Chemical Oxygen Demand in the environmental industry. 

In order to use the DK 20 for COD (Chemical Oxygen Demand) is necessary to configure it by adding a different support system able to manage all the glass required for the COD analysis for processing 20 samples simultaneously.

Fume Neutralization System

Fume Neutralization System
For application where the digestion process produces fumes, acid gases or corrosive substances, the below specific accessories are strongly recommended:
  • JP Pump aspirates noxious fumes
  • SMS Scrubber neutralizes all the fumes

TEMS™ Technology

TEMS™ Technology

DK 20 Kjeldahl digestion units work with the innovative TEMS™ benefits, for huge savings.

Time Saving: from Ambient to 420 °C in only 35 minutes
Energy Saving: limited energy consumption
Money Saving: cost reduction for each analysis
Space Saving: reduce unnecessary use of space


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Genuine consumables for your digestions

Genuine consumables for your digestions

Choosing the right consumables allow the optimization of analytical operations to achieve the highest possible performance of your Digestion Unit. We strongly recommend the use of VELP original consumables in order to be sure to obtain the best performance form your VELP instrument. 

The addition of a suitable catalyst, along with high temperature, have influence on the speed and the efficiency of the mineralization in Kjeldahl analysis. Achieving the highest level of performance in a wide range of Kjeldahl applications is now possible with VELP genuine KjTabs™ catalyst and antifoaming tablets.

VELP Nitrogen Free Weighing Boats are the perfect solution to all the difficult transfer operations of powders or syrupy samples into mineralization test tubes.


Construction material: Epoxy painted with chemical resistant coating
Temperature range: Ambient to 450 °C / 842 °F
Stability of the heating block temperature: ± 0,5 °C
Precision of the heating block temperature: ± 0,5 °C
Set temperature: Digital readout in °C or °F
Temperature Calibration: Automatic
Selectable ramps: up to 4 per program
Digestion time range: 1 to 999 minutes
Time selection: 1 minute steps
Countdown: Digital readout
Selectable language: UK, I, E, F, D, T
Heating Places 20-position
Size of tubes 250 ml test tubes (Ø 42 mm)
Power: 2300 W
Dimensions (WxHxD):
(aluminum block only)
328x138x510 mm (12.9x5.4x20.1 in)
Dimensions (WxHxD):
(aluminum block + support system)
328x702x585mm (12.9x27.6x23 in)
Weight: 23.4 kg (51.6 lb)

Brochures & Leaflets

VELP Scientifica invites you to download brochures and leaflets in order to explore our premium quality solutions and to have all the major key arguments, features and specifications of a product in your hands, in any place, and at any time.

Application notes

Choose among a comprehensive library of Application Notes / White Papers and learn more on how to optimize the performance of your VELP instruments. These documents offer typical analyses of well-known samples, together with official references and suggestions, to make you an expert!


Our compliance to statutory rules and regulations worldwide.
With the CE mark, VELP Scientifica declares that the products are designed and manufactured in compliance with the essential safety requirements of the European Directive on Safety.
The Certification Body (CB) Certificate is an international program created by the IECEE for the acceptance of product safety test results among participating laboratories and certification organizations around the world.
The cNEMKOus mark ensures this product is designed and manufactured in compliance with the International Directive on Safety IEC/EN 61010-1. The cNEMKOus mark has the same legal status as any other NRTL/SCC accredited marks, for U.S. and Canada.


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