• Automatic Kjeldahl Digestion Units - DKL Series

Automatic Kjeldahl Digestion Units - DKL Series

Fully Automatic Kjeldahl Digestion Units for nitrogen analysis and protein determination that incorporate the revolutionary TEMS™ technology for unprecedented Savings in terms of Time, Energy - as much as 35%, Money, and Space.

High Technology
Microprocessor control of precise block temperature
Real-time display of process steps
54 programs (30 pre-installed, 24 customizable)

Automated Operation
Calibration automatic for top precision & repeatability
No hands lowering and lifting of test tubes
Auto separation of the manifold from the rack

Outstanding Reliability
Aluminum block for absolute temperature homogeneity
Unmatched conductivity for fast response up to 450 °C
Conforms to Good Laboratory Practice standard
Premium quality consumables

Practical Functionality
LCD display for immediate understanding
Up to 6 languages available from a wide selection
All necessary items supplied in one package
Very small footprint

Optimized Selection
Choice of models for different workloads
DKL 8 (8-position with 250 ml tubes, Ø 42 mm)
DKL 12 (12-position with 250/400 ml tubes, Ø 42 mm)
DKL 20 (20-position with 250/400 ml tubes, Ø 42 mm)
DKL 42/26 (42-position with 100 ml tubes, Ø 26 mm)
Incorporates TEMS™ technology*

*Saving Time, Energy, Money & Space


JP Pump aspirates noxious fumes
SMS Scrubber neutralizes all the fumes (for safety)
Two JP Pumps are recommended when using DKL 42/26

Special Application: DKL 20 can be used also for testing Chemical Oxygen Demand
Its lift automatically manages all the glass required for processing 20 samples simultaneously

Kjeldahl Digestion Units - Unparalleled Productivity

  • The DKL Series Automated Kjeldahl Digestion Units provide users with the ultimate technology whose objective is to simplify operation, ensuring significant savings. Once set up, the operator can just press the START button and walk away.
  • All regular functions are fully automated, including lowering the test tubes into the heating block, lifting the tubes to expedite cooling and separating the suction manifold from the tube rack, enabling the rack to be slid out and replaced by another to start the next run.
  • Ease of loading and unloading make the VELP DKL a pleasure to use when carrying out Kjeldahl analysis, and there is no need to handle the sample when the tubes are hot!

Kjeldahl Digestion Units - Aluminum Block for Premium Performance

  • DKL Series heating block is entirely made of aluminum alloy, the best material when temperature precision, stability, and homogeneity are required.
  • Even in terms of repeatability and conductivity, aluminum offers incredibly high performance!
  • In accordance with GLP, the analyst must be able to determine what temperature digestion occurred: just by using a common temperature probe, the analyst can measure the effective temperature.
  • And do not forget DKL capabilities in reducing the heating time.

Kjeldahl Digestion Units - TEMS™ Technology

The automatic DKL Kjeldahl digestion units work with the innovative TEMS™ benefits, for huge savings.

Time-Saving: from Ambient to 420 °C in only 22 minutes

Energy Saving: up to - 35% of consumption

Money Saving: huge cost reduction for each analysis

Space Saving: reduce unnecessary use of space

Kjeldahl Digestion Units - High Heating Speed on DKL

The graph shows that rapid heating of DKL Kjeldahl digestion units: by increasing the heating speed, the analysis time is reduced!

All the advantages of a rapid heating combined with the known benefits of a block digester: excellent reliability, high precision, and homogeneity of the temperature, with the possibility to know the real temperature of the digestion.

Kjeldahl Digestion Units - Low Energy Consumption on DKL

Look at the significant amount of energy that you can save with a DKL Kjeldahl digestion unit compared to a conventional digester. DKL Series reduces dramatically consumption and CO2 emission. In a world where respect for the environment is increasingly important, VELP shows exceptional qualities, providing a significant contribution to this topic cutting any form of pollution. Perform more analyses or use other instruments to increase your business...without any additional cost!

Kjeldahl Digestion Units - Space Saving with DKL

Everybody knows that there is never enough bench space in a laboratory, this is why we have made the DKL series as compact as possible. The narrow footprint enables you to optimize bench space according to need: fit more instruments on the same lab bench or make different use of the extra space available. 

Kjeldahl Digestion Units - Clear Communication at a Glance on DKL

Enjoy the simplicity of the DKL’s display. Extremely bright, easy to read and practical with all the most important parameters available at a single glance. Current temperature and ramp settings are clearly viewed on the display. In this way, the user can monitor every stage of analysis as well as selecting options such as language (including ideograms).

Improved communication leads to improved efficiency.

Kjeldahl Digestion Units - Automatic Digestion Unit for COD Analysis

DKL Series is really versatile!

Particularly, DKL 20 can be used also for COD (Chemical Oxygen Demand): its lift can automatically manage all the glass required for the COD analysis for processing twenty samples simultaneously.

Just a few dedicated accessories are required for testing COD analysis: A00000237, A00000145, A00001041, A00001045, and A00001042.

*Download PDF


Construction material:Stainless steel with a chemical resistant coating
Models:DKL 8 8-position for 250 ml test tubes (Ø 42 mm)
DKL 12 12-position for 250/400 ml test tubes (Ø 42 mm)
DKL 20 20-position for 250 ml test tubes (Ø 42 mm)
DKL 42/26 42-position for 100 ml test tubes (Ø 26 mm)
Set temperature:Digital readout in °C or °F or K
Countdown:Digital readout
Selectable language:UK, I, E, F, RUS, CN + Additional Customizable (downloadable)
Power:DKL 8 1150 W
DKL 12 1500 W
DKL 20 2300 W
DKL 42/26 2300 W
Weight:DKL 8 19.7 kg (43.5 lb)
DKL 12 23.3 kg (51.4 lb) 
DKL 20 30.8 kg (68.0 lb)
DKL 42/26 33.5 kg (74.0 lb)
Dimensions (WxHxD):DKL 8 210x690x540 mm (8.3x27.2x21.3 in) 
DKL 12 266x690x540 mm (10.5x27.2x21.3 in) 
DKL 20 322x690x584 mm (12.7x27.2x23.0 in)
DKL 42/26 322x690x584 mm (12.7x27.2x23.0 in)


Temperature range:Ambient to 450 °C / 842 °F
Temperature Calibration:Automatic
Stability of the heating block temperature:± 0,5 °C
Precision of the heating block temperature:± 0,5 °C
Digestion time range:1 to 999 minutes
Time selection:1 minute steps
Program library:54 methods: 30 pre-installed + 24 user-programmable
Selectable ramps:4 ramps per program


Damaged temperature probe:Automatic detection and alarm message
Lift movement:Visual/acustic signal
Hot surface:Visual signal (if T>50 °C)