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UDK 169 with AutoKjel Autosampler - Automatic Kjeldahl Nitrogen Protein Analyzer

Fully automatic Kjeldahl Analyzer (Distillation unit + integrated colorimetric titrator) with connection to autosampler, for high sample throughput, maximum flexibility and unattended operation.
UDK 169 F30200160
AutoKjel F30200430
UDK 169 & AutoKjel S30200160

Fully Automated Analysis

Fully Automated Analysis

The completely automatic Kjeldahl distillation and titration system offer great performance and the maximum in terms of safety for the user.

Automatic addition of all the reagents involved with low level warning, simplifies the routine activity whilst the possibility to set the steam output from 10% to 100% enlarges the application range of UDK 169. Automatically the unit will perform distillation and titration.

The possibility to set the steam output from 10% to 100% makes the instrument highly recommended for a wide range of applications, including the most specific, which require special parameters. UDK 169 is ideal for reliable determination of ammoniacal nitrogen, protein nitrogen (Kjeldahl), nitric nitrogen (after reduction/devarda), phenols, volatile acids, cyanides and alcohol content.

At the end of the analysis, all the residues can be aspirated automatically, both for distillation and titration.

Maximum Productivity with Autokjel

Maximum Productivity with Autokjel

UDK 169 can be used either alone or in combination with the AutoKjel autosampler, for a highly productive system capable of autonomously processing up to 24 samples with standard test tubes (250 ml) or 21 Jumbo test tubes (400 ml).

Sample tubes are taken from the carousel and fed directly into UDK 169 for further processing and reliable results, allowing the user to operate in complete safety and with extreme ease, without requiring an attendant.

The UDK 169 & AutoKjel Kjeldahl analyzer is developed for continuous operation, providing the maximum sample throughput and data processing automation.

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
  •   Low thermal dispersion
  •   Great repeatability
  •   High performance and resistance
  •   Maintenance-free
  •   Safety-thermostat
  •   Works with deionized water

Multitasking Software

Multitasking Software

Improved communication leads to improved efficiency.

The UDK 169 distiller is a Kjeldahl automatic distiller equipped with a control panel with 6'' 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 and allows to program in an easy and intuitive way all the parameters including the volumes of reagents such as sodium hydroxide, water, boric acid and the regulation of steam production to carry out distillations and titrations in automatic mode. 

  • Excellent usability
  • Flexible, versatile and multi-language
  • Intuitive data entry and programming
  • Unlimited library with all the analyses
  • Data export in .xls, .txt, .csv (according to LIMS) also on USB key
  • Instantaneous reporting
  • Direct access to the archive from remote PC in real time without any download 

UDK 169 software is also able to control the AutoKjel autosampler when high productivity is required.

Colorimetric Titration

Colorimetric Titration

The automatic Kjeldahl analyzer UDK 169 is the top of the range model offering the ultimate in capabilities including colorimetric titration, as recommended by the AOAC.

The UDK 169 colorimetric titration is based on precise chemical reactions with indicators.  VELP integrated titrator works by dosing an acidic titrant solution to the boric acid containing the ammonia distilled from the sample. This titration process results in a color change that is evaluated by the system.

  • calibration-free
  • maintenance-free
  • not sensitive to volume and external light
  • automated, for maximum simplicity and security

UDK 169, the most reliable titration system in the Kjeldahl analysis!

TEMS™ Technology

Save Time, Energy, Money and SpaceSave Time, Energy, Money and 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: 6" color touch screen
Delay time (Devarda Alloy Analysis) 0 – 99 min
Protocol library: 55 methods: 31 pre-installed + 24 customizable
Reproducibility (RSD): ≤ 1 %
Recovery: ≥ 99.5 % at nitrogen levels between 1 and 200 mg N
Detection limit: ≥ 0.1 mg N
Analysis time: from 4 minutes (including titration)
Sodium hydroxide addition: automatic
Water addition: automatic
Boric acid addition: automatic
Sodium hydroxide volume: 0 - 150 ml
Water volume: 0 - 200 ml
Boric acid volume: 0 - 100 ml
Distillation and titration 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: Ethernet, 2 x USB and RS232 for PC, printer, mouse, pen drive, balance
On-board archive for data storage Yes
Power: 2200 W
Weight: 31 kg / 68.3 lb
Dimensions (WxHxD): 385x780x416 mm (15.2x30.7x16.4 in)

UDK 169 & AutoKjel

Autosampler capacity:
24-pos. carousel, 250 ml test tubes (included with AutoKjel)
21-pos. carousel, 400 ml test tubes (optional)
Power: 2250 W
Weight: 131 kg (288.8 lb)
Dimensions (WxHxD): 830x1730x640 mm (32.7x68.1x25.2 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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