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DK 6/48 Digestion Unit

Kjeldahl Digestion Units with a 6-position aluminum heating block for test tubes of 48mm diameter that offers an excellent thermal homogeneity. 
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DK 6/48F30100410
DK 6/48 Digester SystemS30100410
DK 6/48 Digester SystemS30110410
DK 6/48F30110410

Thermal homogeneity and precision

Thermal homogeneity and precision
The DK 6/48 Series digestion unit with aluminum 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 at all selectable temperatures.

The DK 6/48 Series guarantees accuracy and repeatability. Program your methods with digestion time and up to 4 temperature ramps through the intuitive digital display. 

The DK 6/48 series perform batch digestion of up to 6 samples with 300 ml test tubes - Ø 48 mm, reducing the power consumption of 13% compared to the previous series.

Low energy consumption permit to have low costs for every single analysis and limit CO2 release.

Space saving design

Space saving design
The new design of the DK Series has been studied in order to let laboratories to save valuable space under the fume hood. 

The DK 6/48 digestion units have very compact dimensions: the new aluminum heating block has been lowered as a consequence of the enhanced performance of the new Series.

The structure is manufactured from stainless steel studied and tested to assure a strong resistance to chemical or mechanical agents.

A new intuitive interface and protection

A new intuitive interface and protection
The new bright digital display provides maximum visibility and easy reading of the information. The inclination of the frontal panel protects it from the spillage and hot chemicals.

The usage of the instrument is controlled by only 4 keys: they allow an easy navigation through all the functions during programming or normal use.

The new grid ensures enhanced heating performances and protects the aluminum heating block and the tubes.

Fume Neutralization System

Fume Neutralization System
 For applications where the digestion process produces fumes, acid gases or corrosive substances, the below specific accessory is strongly recommended:
  • KS 1000 Scrubber neutralizes all the fumes

TEMS™ Technology

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

Time Saving: rapid heating reduces wasted time
Energy Saving: limited energy consumption thus cutting CO2 emissions
Money Saving: cost reduction for each analysis
Space Saving: the narrow footprint saves valuable laboratory bench 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 Scientifica genuine KjTabs™ catalyst and antifoaming tablets.

VELP Scientifica 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: EN, IT
Heating Positions 6-position
Size of tubes 300 ml test tubes (Ø 48 mm)
Power: 1000 W
Dimensions (WxHxD):
(aluminum block only)
220x140x350 mm
8.7x5.5x13.8 in
Dimensions (WxHxD): 220x690x350 mm
8.7x17.2x13.8 in
Weight: 9 kg (35.7 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.

Comparison tables

Select the category of products you are interested in and this tool will give you an easy overview of what is available at VELP in order to find the product that is perfect for you. These comparison tables provide a brief description with side by side features from basic equipment to the most advanced analytical solutions.

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.
Service offering
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Check technical sheets with answers to most frequently asked questions
What do we have to add to the test tube to perform the digestion step?
To properly perform the digestion step, it is necessary to prepare the glass test tube with the sample and:

1. KjTabs™ catalyst tablets to accelerate the digestion
2. Antifoam tables (especially recommended in the case of samples with a high-fat content)
3. 12 - 15 ml of concentrated sulfuric acid (98%)
How to insert the sample into the test tube?
The sample must be weighed within Nitrogen free weighing boats (CM0486000) and then placed inside the test tubes. In so doing there is no risk of part of the sample sticking to the test tube parts and the digestion therefore not being performed correctly.
Which kind of test tubes does VELP supply?
VELP provides a full set of test tubes. Download here the comparison table!
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