Velp Kjeldahl distillation units, steam distillations (Velp UDK series)

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Velp UDK139 semi-automatic Kjeldahl distillation unit

Velp UDK129 Kjeldahl distillation unit

Velp UDK149 Kjeldahl distillation unit with external titrator

Velp UDK159 Kjeldahl distillation unit with integrated titrator

Velp UDK 169 Kjeldahl distillation unit with integrated titrator and autosampler

Velp Kjeldahl distillation units, steam distillations (Velp UDK series)

Velp Scientifica

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The Kjeldahl method is a traditional but versatile nitrogen determination method that can be used for food and feed industry samples (cereal, meat, fish, milk, dairy products, fruit and vegetables), beverages, environmental analytical samples (agricultural, soil, fertilizer, water and wastewater ), for the analysis of chemical and pharmaceutical samples as well as other industrial samples (paper, textile, rubber, plastic and polymer). Kjeldahl nitrogen (TKN) is a frequently checked parameter in the field of wastewater treatment, but Kjeldahl analysis is also used to determine the crude protein content of food industry samples.

Kjeldahl nitrogen is the sum of the organic nitrogen, ammonia (NH₃) and ammonium ion (NH₄⁺) content of the sample. Total nitrogen is the sum of Kjeldahl nitrogen and nitrite (NO₂^-) and nitrate (NO₃^-) ions.

More details

The Kjeldahl analysis consists of 3 steps:

1. Destruction of the organic matter content of a sample by adding concentrated sulfuric acid (H2SO4) at high temperature, which can happen:

with a traditional Kjeldahl digester
with an automatic Kjeldahl digester or
and faster and more economical than all this with a microwave-assisted Kjeldahl digester.

2. Extraction of the ammonia content by steam distillation after diluting the acidic ammonium sulfate solution resulting from destruction and neutralizing it with sodium hydroxide (NaOH).

3. Determination of ammonia (nitrogen) content by titration

Velp UDK type 129, 139 and 149 stills are capable of steam distillation (second step), while the new type 159 and 169 analyzers are capable of combined complete analysis (second and third step).

A unique feature of Velp steam distillation unit - titanium condenser

The use of VELP Scientifica's patented titanium condenser results in significant cooling water savings (up to 0.5 l/min). This is because; the efficiency of the titanium capacitor is 20x better than that of the capacitor made of glass..
The graph on the left illustrates the advantage of titanium over a glass capacitor. With the help of the titanium condenser used in the Kjeldahl stills of Velp UDK, the temperature of the distillate (35 °C) can be kept below the threshold temperature with less water.

Safety elements of Velp steam distillation units

The safe operation of the UDK series is guaranteed by the following elements:

1. Low pressure steam generator
2. Sensitive test tube closing arm
3. Sensor security door
4. Cooling water with flow monitor
5. Sensitive test tube holder
6. Drip tray
7. Service door (electric shutdown)
8. Colored reagent tubes
9. Display of reagent quantities (≥UDK139)

In addition to Kjeldahl distillation, Velp's steam stills can also be used to determine the content of nitrite, phenol, volatile acids, cyanides, and alcohol.

Increase the productivity of your Kjeldahl analysis with an autosampler

The UDK 169 Kjeldahl distillation apparatus is a stand-alone nitrogen/protein determiner. However, this type can be supplemented with a 24-slot sample changer, with the help of which the serial (mass) determination of N/protein can be performed without user intervention.

Comparison table of Velp steam distillation units

Specifications	UDK129 Kjeldahl distillation unit	UDK139 semi-automatic distillation unit	UDK149 automatic distillation unit with external titrator connection option	UDK159 automatic distillation unit with integrated titrator	UDK169 automatic distillation unit with integrated titrator and autosampler
Operating time	5 minutes for 100 ml of distillate	4 minutes for 100 ml of distillate	3 minutes for 100 ml of distillate	4 minutes (including titration)	4 minutes (including titration)
Reproducibility (RSD)	≤ 1%	≤ 1%	≤ 1%	≤ 1%	≤ 1%
Recovery (1-200 mg N)	≥ 99.5 %	≥ 99.5 %	≥ 99.5 %	≥ 99.5 %	≥ 99.5 %
Automatic NaOH dosing	●	●	●	●	●
Automatic HO₂ dosing		●	●	●	●
AutomaticH₃BO₃ dosing			●	●	●
Selectable distillation time	●	●	●	unnecessary due to titration	unnecessary due to titration
Distillation residue removal		●	●	●	●
Steam flow control (10-100%)		●	●	●	●
Delay (Devarda-methode)	●	●	●	●	●
Serial distillation			●	●	●
Water saving mode	●	●	●	●	●
Display	LCD	3.5" color touch screen	3.5" color touch screen	6" color touch screen	6" color touch screen
Number of programs	1	10	20	55 (31 + 24)	55 (31 + 24)
Language choice			●	●	●
Device memory			●	●	●
Removal of titration residue			●	●	●
Automatic titration vessel cleaning			●	●	●
Replaceable burette				●	●
Mouse/printer connection		●	●	●	●
PC/USB connection			●	●	●
Balance connection				●	●
Autosampler connection					●
Size (W x H x D)	385 x 780 x 416 mm	385 x 780 x 416 mm	385 x 780 x 416 mm	385 x 780 x 416 mm	830 x 1730 x 640 mm
Weight	24 kg	26 kg	27 kg	31 kg	170 kg
Consumption	2.100 W	2.100 W	2.100 W	2.200 W	2.200 W

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UDK 129 Kjeldahl distillation unit, model 2021

331.F30200125

UDK129 distillation unit

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"The renewed UDK 129 Kjeldahl still. Suitable for determining ammonia-nitrogen, protein, nitrogen content (Kjeldahl or direct alkaline distillation), nitrite-nitrogen (after reduction), phenols, volatile acids, cyanides, alcohol and Devarda nitrogen determination. Made of technopolymer, with a strong and chemical-resistant structure. Durable. The UDK 129 works automatically, the sodium hydroxide dosage and distillation time can be set using the LCD display to achieve reliable and accurate results. The high-precision pumps ensure constant and accurate dosing of the reagents. The cooling water stops automatically during breaks, thus reducing its consumption. With VELP's patented steam generator, which provides high performance, safety (no pressure inside) and no maintenance. The titanium condenser offers reduced water consumption, ensuring that the temperature of the distillate always remains below the threshold. Structure: corrosion-resistant technopolymer. Delay time: 0-99 minutes. Distillation time: 5 minutes to collect 100 ml of distillate. Sodium hydroxide dosing: automatic. Sodium hydroxide volume: 0-100 ml. Water consumption: 0.5 l/min at 15°C, 1 l/min at 30°C. Repeatability: <1%. N detection 99.5% (in the range of 0.04 - 220 mg N). Power: 2100 W, 230 V, 50-60 Hz. Size: 385x780x416 mm. Weight: 25 kg."

UDK 139 Kjeldahl semi-automatic distillation unit, model 2021

331.F30200135

UDK139 semi-automatic distillation unit

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"Suitable for determining ammonia-nitrogen, protein, nitrogen content (Kjeldahl or direct alkaline distillation), nitrite-nitrogen (after reduction), phenols, volatile acids, cyanides, alcohol and Devarda nitrogen determination. Made of technopolymer, with a strong and chemical-resistant structure. Durable. The UDK 139 works automatically, using the control panel with a 7"" high-resolution color touch-screen graphic display, sodium hydroxide, water dosage and distillation time can be adjusted to achieve reliable and accurate results. The high-precision pumps ensure constant and accurate dosing of reagents. Removal of distillation residue: automatic. With VELP's patented steam generator, which provides high performance, safety (no pressure inside) and no maintenance. The titanium condenser offers reduced water consumption, ensuring that the temperature of the distillate always remains below the threshold. Data export in .xls, .txt, .csv formats and maximum compatibility with LIMS system and VELP Ermes Cloud Platform. 3 levels of authorization and authorization according to GLP Extract archive from device. Serial distillation function to speed up data entry. Storage of 10 customizable methods. Optional barcode technology simplifies distillation data management and calculation of results. Structure: corrosion-resistant technopolymer. Delay time: 0-99 minutes. Distillation time: 4 minutes to collect 100 ml of distillate. Sodium hydroxide dosing: automatic. Sodium hydroxide volume: 0-150 ml. Boric acid dosing: manual. Water volume: 0-200 ml. Steam flow control: between 10 and 100%. Water consumption: 0.5 l/min at 15°C, 1 l/min at 30°C. Repeatability: <1%. N recovery ?99.5% (0.04 - 220 mg N range). Lower detection limit: > 0.015 mg N Power: 2200 W, 230 V, 50-60 Hz. Size: 385x780x416 mm. Weight: 27 kg."

331.F30200140

UDK149 automatic distillation unit with external titrator connection option

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It is suitable for the determination of ammonia nitrogen, protein, nitrogen content (Kjeldahl or direct alkaline distillation), nitrite nitrogen (after reduction), phenols, volatile acids, cyanides, alcohol and Devarda nitrogen. Made of technopolymer with a strong and chemical resistant structure. Durable. The UDK 149 operates automatically, with a 3.5"" high resolution colour touch screen graphic display control panel to adjust sodium hydroxide dosage and distillation time to achieve reliable and accurate results. High precision pumps ensure constant accurate dosing of reagents. With VELP's patented steam generator, which provides high performance, safety (no pressure inside) and requires no maintenance. The titanium condenser offers reduced water consumption, ensuring that the distillate temperature is always below the threshold. Construction: corrosion resistant technopolymer. Delay time: 0-99 min. Distillation time: 3 minutes to collect 100 ml of distillate. Sodium hydroxide dosing: automatic. Sodium hydroxide volume: 0-150 ml. Water volume: 0-200 ml. Gas flow control: 10 to 100%. Water consumption: 0,5 l/min at 15°C, 1 l/min at 30°C. Repeatability: <1%. N detection:recovery≥ 99.5 % (range 1 to 200 mg N). Power: 2100 W, 230 V, 50-60 Hz. Size: 385x780x416 mm. Weight: 27 kg.

UDK 159 automatic Khejdahl distillation unit with built-in titrator type 2021

331.F30200155

UDK159 automatic distillation unit with integrated titrator

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"Suitable for determining ammonia-nitrogen, protein, nitrogen content (Kjeldahl or direct alkaline distillation), nitrite-nitrogen (after reduction), phenols, volatile acids, cyanides, alcohol and Devarda nitrogen determination. Made of technopolymer, with a strong and chemical-resistant structure. Durable. The UDK 159 operates automatically, using the control panel with a 7"" high-resolution color touch-screen graphic display, the sodium hydroxide dosage and distillation time can be adjusted to achieve reliable and accurate results. The high-precision pumps ensure constant and accurate dosing of the reagents. With VELP's patented steam generator, which offers high performance, safety (no pressure inside) and no maintenance, the titanium condenser offers reduced water consumption, ensuring that the temperature of the distillate is always below the threshold. Structure: corrosion-resistant technopolymer. Delay time (e.g. Davarda): 00 sec - 99 min 59 sec Analysis time: from 4 minutes (including titration). Methods: 32 standard + 24 unique Sodium hydroxide dosing: automatic. Water dosing: automatic: Boric acid dosing: automatic. Sodium hydroxide volume: 0-150 ml. Water volume: 0-200 ml. Boric acid volume: 0-100 ml. Gas flow control: between 10 and 100%. Water consumption: 0.5 l/min at 15°C, 1 l/min at 30°C. Repeatability: <1%. N detection 99.5% (in the range of 0.04 - 220 mg N). Power: 2200 W, 230 V, 50-60 Hz. Size: 385x780x416 mm. Weight: 31 kg. ERMES connection: via Wi-Fi or LAN. Connectors: 2 x USB (scale, barcode scanner, mouse, printer, pen drive), Ethernet (computer, Ermes)"

UDK 169 Kjeldahl analyzer (distillation unit + integrated colorimetric titrator) with AutoKjel autosampler

331.S30200160

UDK169 automatic titrator with integrated titrator and autosampler

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"For your analyses concerning different applications such as determining ammoniacal nitrogen

Patented steam generator

Velp's UDK series steam stills are equipped with a patented steam generator. Advantages of the technology:

fast warm-up time,
complete safety: no internal pressure,
low heat loss,
excellent repeatability,
excellent performance and resistance,
maintenance free,
safety thermostat,
can be operated with deionized water.

Adjustable power from 10% to 100%.

Velp steam distillation unit brochure

Velp steam distillation unit with autosampler (AutoKjel) brochure

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