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UDK 129 Kjeldahl Distillation Unit

Entry-level distillation for Kjeldahl protein determination, Non-Protein Nitrogen (NPN), volatiles and more. Simple and reliable solution with unique features.
UDK 129 F30210125
UDK 129 F30200125

Ease of use and safety for your analyses

Ease of use and safety for your analyses

The UDK 129 is an entry-level and reliable solution for safe distillations. The most suitable distiller for laboratories looking for a simple but efficient instrument for Kjeldahl nitrogen TKN, proteins, ammoniacal nitrogen, nitric nitrogen (Devarda), TVBN, sulfites, phenols, volatile acids, cyanides, and alcohol content.

The Kjeldahl distillation unit UDK 129 includes features that ensure efficient and reliable distillation, far beyond the expectations of an ordinary entry-level unit.
  • Programmable sodium hydroxide addition
  • High-precision pump ensuring constant accurate dosing of the reagent
  • Intuitive interface for easy analysis settings
  • Maximum safety for the operator 
  • Unmatched flexibility with a wide accessory range 

Unrivalled technologies to support your laboratory - Titanium Condenser and Technopolymer Splash Head

Unrivalled technologies to support your laboratory - Titanium Condenser and Technopolymer Splash Head

The UDK 129 features the unique VELP patented titanium condenser designed for efficient thermal exchange and low water consumption. 

The distillate temperature is always kept below the Kjeldahl threshold value (35 °C), as indicated in the Kjeldahl method, without nitrogen loss.
  • Reduced water consumption
  • High resistance material with prolonged lifespan 
  • Reduced break risks during routine cleaning 
The exclusive VELP Technopolymer Splash Head incorporated in the UDK 129 is designed for high throughput providing state-of-the-art durability and resistance.
  • Chemical resistant materials 
  • Unmatched lifespan of up to 10,000 analyses 
  • Maintenance-free and no risk of breaking 

Reliability and safety for your lab

Reliability and safety for your lab

The UDK 129 is provided with the most complete set of safety features to ensure maximum operator safety. Sensors monitor tube in place, safety doors and cooling water flow-rate. 

The VELP Patented Steam Generator guarantees safe working conditions working without pressure:

  • Rapid pre-heating time
  • High performance and resistance
  • Maintenance-free
  • Works with deionized water

Intuitive user interface ensuring ease-of-use

Intuitive user interface ensuring ease-of-use

The bright LCD display and easy-to-use menu guide the operator in setting the instrument working conditions, including distillation time and the volume of sodium hydroxide. 

The low-profile button design ensures complete comfort and enables easy process handling.

  • Clear readability of analysis time
  • Intuitive menu and sub-menu navigation
  • Counters for maintenance
  • Dedicated service menu

TEMS™ Technology

TEMS™ Technology
UDK Series Kjeldahl distillation units work with the innovative TEMS™ benefits, for unmatched 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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Vreceiver™ boric acid with indicator sealed bags

Vreceiver™ boric acid with indicator sealed bags
VELP unique Vreceiver™ is a certified formula composed of Boric Acid powder and a mixture of indicators mentioned by AOAC methods (Bromocresol Green and Methyl red) allowing fast and standardized receiving solution preparation for colorimetric titration.

The receiving solution is prepared in a few minutes facilitating the day by day operations instead of the typical time consuming process using single reagents. The result is a reliable and standardized solution for colorimetric titration.


Structure Corrosion-resistant technopolymer
Display LCD display
Analysis time 5 minutes for 100 ml of distillate
MEASURING RANGE 0.04 - 220 mg N
Reproducibility (RSD) ≤ 1 %
Recovery ≥ 99.5 %
Detection Limit (LOD) > 0.015 mg N
Sodium hydroxide addition Automatic
DELAY TIME (DEVARDA ALLOY ANALYSIS) 00 sec - 99 min 59 sec
WATER CONSUMPTION From 0,5 L / min to 15°C
From 1 L / min to 30°C
PROTOCOL LIBRARY 1 customizable method
POWER INPUT 1700 W at 115 V
2200 W at 230 V
DIMENSIONS (WxHxD) 385x780x416 mm
15.2x30.7x16.4 in
WEIGHT 25 kg
55 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.


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