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UDK 139 Semi-Automatic Kjeldahl Distillation Unit

Semi-automatic Kjeldahl distillation unit for your analyses concerning different applications such as determining ammoniacal nitrogen, protein determination, nitrogen content (Kjeldahl or direct alkaline distillation), nitric nitrogen (after reduction/Devarda), phenols, volatile acids, cyanides and alcohol content.
UDK 139 F30200130

Semi-Automatic Kjeldahl Distillation Unit

Semi-Automatic Kjeldahl Distillation Unit

The semi-automatic Kjeldahl distillation unit UDK 139 runs automatically, after setting distillation time, sodium hydroxide and water addition and steam generation output level between 10 and 100% using the innovative 3.5'' color touch screen. The high-precision pumps ensure constant accurate dosing of reagents.

The Kjeldahl distillation unit UDK 139 combines excellent value-for-money with high reliability and advanced performance.

Analysis times are reduced thanks to application optimization and the possibility to select up to 10 work programs.

Exclusive Titanium Condenser

Exclusive Titanium Condenser

VELP Scientifica has developed and patented the innovative titanium condenser able to ensure high performance and considerable water savings (from 0.5 l/min at 15 °C - 1 l/min at 30 °C) with minimal maintenance.

The titanium condenser ensures that distillate temperature always remains below the safe threshold value (35 °C), as indicated in the Kjeldahl method, without nitrogen loss.


Patented Steam Generator

Patented Steam Generator

The steam generator used by UDK Kjeldahl distillation units offers unique performance, being a patented solution

A thermostat ensures the correct functioning of the steam generator, a safety thermostat eliminates risks for the operator and guarantee safe working conditions.

The high level of precision and accuracy ensures correct and detailed results without any leaks even after intensive use.

  • Rapid (p)re-heating time
  • Total safety: no internal pressure
  • Great repeatability
  • High performance and resistance
  • Maintenance-free
  • Safety-thermostat
  • Works with deionized water
  • Low thermal dispersion


Multitasking Software

Multitasking Software

Improved communication leads to improved efficiency.

The UDK 139 is a Kjeldahl automatic distiller equipped with a control panel with 3,5'' high resolution colour touch-screen graphic display and easy to use multitasking software that guides the operator step by step through menus and sub-menus. Easy to read and practical with all the most important parameters available at a single glance, the multitasking software enables the operator to set all the parameters for a fully automatic distillation and titration processes.

  • Excellent usability
  • Multitasking software on a bright screen
  • Flexible, versatile and multi-language
  • Intuitive data entry and programming, very easy to upgrade

TEMS™ Technology

Save Time, Energy, Money and SpaceSave Time, Energy, Money and Space


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Structure: Corrosion-resistant technopolymer
Display: 3.5" color touch screen
Delay time (Devarda Alloy Analysis) 0 – 99 min
Protocol library: 10 customizable methods
Reproducibility (RSD): ≤ 1 %
Recovery: ≥ 99.5 % at nitrogen levels between 1 and 200 mg N
Detection Limit: ≥ 0.1 mg N
Distillation time: 4 minutes to collect 100 ml of distillate
Sodium hydroxide addition: automatic
Water addition: automatic
Sodium hydroxide volume: 0 - 150 ml
Water volume: 0 - 200 ml
Distillation time: settable
Distillation residues removal: automatic
Steam flow regulation: from 10 to 100 %
Tap water consumption: from 0,5 l/min at 15 °C – from 1 l/min at 30 °C
Connections: 2 x USB for printer, mouse
Power: 2100 W
Weight: 26 kg / 57.3 lb
Dimensions (WxHxD): 385x780x416 mm (15.2x30.7x16.4 in)

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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