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UDK 129 Kjeldahl Distillation Unit

Entry-level 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 129 F30200120
UDK 129 F30210120

Entry-level Kjeldahl Distillation Unit

Entry-level Kjeldahl Distillation Unit

The Kjeldahl distillation unit UDK 129 runs automatically, after setting sodium hydroxide addition and distillation time using the LCD display in order to get reliable and accurate results. The high-precision pumps ensure constant accurate dosing of reagents and the cooling water is automatically stopped during pauses, thus cutting down on its consumption.

UDK 129 includes many features that ensure efficient and reliable distillation, far beyond expectations of an ordinary entry level unit.

The UDK 129 Distillation Unit ensures the highest safety standards to provide maximum protection to the operator: the use of an innovative system allows the insertion of the test tube in complete safety and the use of test tubes of various sizes.

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 patented 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 

TEMS™ Technology

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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
Delay time (Devarda Alloy Analysis) 0 – 99 min
Distillation time: 5 minutes to collect 100 ml of distillate
Sodium hydroxide addition: automatic
Sodium hydroxide volume: 0 - 100 ml
Tap water consumption: from 0,5 l/min at 15°C – from 1 l/min at 30°C
Protocol library: 1 customizable method
Reproducibility (RSD): ≤ 1 %
Recovery: ≥ 99.5 % at nitrogen levels between 1 and 200 mg N
Detection Limit: ≥ 0.1 mg N
Power: 2100 W (1700 W at 115V)
Weight: 25 kg / 55 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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