Kjeldahl Nitrogen Analyzer

Kjeldahl Nitrogen Analyzer

Kjeldahl Nitrogen Analyzer

The Kjeldahl nitrogen analyzer is a highly accurate and efficient instrument designed for determining nitrogen content in various samples, particularly in food, feed, and environmental testing. It automates the traditional Kjeldahl method, offering fast, precise results while simplifying the process of digestion, distillation, and titration. With advanced features such as user-friendly controls, safety mechanisms, and robust construction, this analyzer is ideal for laboratories that require reliable and repeatable nitrogen analysis. Kjeldahl nitrogen analyzer supplied by Drawell is trusted for its performance and ease of use in both research and industrial settings.

Kjeldahl Nitrogen Analyzer

Features of Kjeldahl Nitrogen Analyzer

  1. Made of special powder-coated steel sheet, resistant to chemical agents and mechanical attack.
  2. Simple structure and easy operation.
  3. Optimized internal configuration, easy installation, and maintenance.
  4. The operation is safe and does not require contact with reagents.
  5. The distillation time is short, improving work efficiency.
  6. It can store experimental programs to meet different requirements of users.
  7. Perfect protection system: remind when the digestive tube is not in place to prevent overheating or over-pressure of the steamer; alarm when the distillation is over.
  8. Manual and automatic, with titration and without titration can be selected.

Application of Kjeldahl Nitrogen Analyzer

The Kjeldahl nitrogen analyzer uses the Kjeldahl method to detect the content of ammonia, protein nitrogen, phenol, volatile fatty acid, cyanide, sulfur dioxide, ethanol, etc. in grains, food, feed, water, soil, sludge, sediment, and chemicals. It has a very good price-performance ratio, and only the titration process requires manual operation, which is very suitable for routine testing by laboratories and inspection institutions. It is widely used in the analysis of nitrogen or protein content of food, crops, seeds, soil, fertilizers, and other samples.

  • Application of Kjeldahl Nitrogen Analyzer
  • Application of Kjeldahl Nitrogen Analyzer
  • Application of Kjeldahl Nitrogen Analyzer
  • Application of Kjeldahl Nitrogen Analyzer
  • Application of Kjeldahl Nitrogen Analyzer
  • Application of Kjeldahl Nitrogen Analyzer

How to Choose the Model?

A: Model DW-ATN-100 is semi-auto equipment. Other models all are automatic type.

A: Model DW-K9860 and DW-K1160 include titration fuction. Other models do not have.

Working Principle of Kjeldahl Nitrogen Analyzer

When the sample is fully digested and cooled down to room temperature, distillation can be performed, its principle is as follows:

(NH4)2SO4+2NaOH=Na2SO4+2H2O+2NH3↑

separate out ammonia with alkali solution under the help of high temperature steam, collect it in

a conical flask containing boric acid absorption liquid (with mixed indicator), finally, titrate with

H2SO4 or HCL.

How Do I Prepare Samples For Kjeldahl Nitrogen Analysis?

Sample preparation depends on the matrix but generally involves homogenization to a fine, uniform powder or paste. Accurate weighing (typically 0.1-2g dry weight) is crucial. Liquids may be used directly or concentrated. Fatty samples often require defatting beforehand.

Operation Precautions of Kjeldahl Nitrogen Analyzer

  1. After starting the apparatus preheating is needed; please directly enter manual mode to select distillation, discharge steam through steam tube for about 1min.
  2. Performing water, alkali and acid calibration is a must before using the apparatus.
  3. The digestive tube should be well positioned to jack the rubber plug.
  4. As the digestive tube is very hot after distillation, gloves should be worn to avoid scalding when taking the tube down.
  5. Condensated water must flow smoothly during distillation.
  6. The filled alkali must ensure the alkalinity of digestive solution greater than or equaling to 11.
  7. If the apparatus will not be used for a long time in winter, water inside the steam generator must be drained out to avoid cracking

Kjeldahl Nitrogen Analyzer Display

Kjeldahl Nitrogen Analyzer display
Kjeldahl Nitrogen Analyzer display

Kjeldahl Nitrogen Analyzer Related Products

Heavy Metal Digestor DW-SH230N

DW-SH230N Heavy Metal Digestor, with the advantages of rapid disintegration, high efficiency, convenience and large processing capacity, is suitable for food, medicine, agriculture, forestry, environmental protection, chemical, biochemical and other industries, as well as higher education institutions, scientific research departments on soil, feed, food, ore, etc.It is suitable for use with atomic absorption, atomic fluorescence, ICP-AES and other analytical instruments.

Heavy Metal Digestor DW-SH230N Features

  1. The temperature inside the furnace is continuously adjustable, the temperature of the controlled point is constant, the heat transfer efficiency is high, and the instrument is easy to operate.
  2. The Teflon coating can effectively prevent the corrosion of the instrument by the acid and acid gas generated during the digestion process.
  3. Deflector tank design prevents acid from splashing into the circuit during the experiment.
  4. Over-voltage, over-current, overheating and other multiple protections for the whole machine.
  5. Embedded software temperature control technology, precise, stable and uniform temperature control, small average temperature difference in the furnace, good consistency of sample digestion.
  6. Intelligent monitoring of the working status of each heating unit, real-time control of instrument operation.
  7. Eco-friendly fiber and air duct insulation for better insulation.
  8. Teflon and borosilicate glass test tubes are available.
  9. Surrounding three-dimensional heating, so that all parts of the sample are evenly heated, to prevent the maximum extent of heat dissipation.
  10. Real-time human-machine dialogue, experiment time to cut off the output.
DW-SH230N

Heavy Metal Digestor DW-SH230N Specifications

Product ModelSH230N
Temperature control rangeRoom temperature +5℃～ 450℃
Temperature control accuracy±0.1°C
Heating methodInfrared heating and high purity graphite conduction
Thermal insulationEco-friendly fiber and air duct insulation
Anti-corrosion on the upper surface of the housingPart stainless steel Part Teflon
Digestion tubeGlass tube with scale 50mL (full capacity 100mL)
PTFE tube without scale (full capacity 70mL)
Processing Capacity30pcs/lot
Power supply220V AC±10% 50Hz
Power Rating3.6KW
Dimension (L×W×H)515mm421mmX211mm
Net weight22Kg

Order Process

order process of Automatic melting point meter

Why Choose Us?

  1. Rich categories, 9 models of UV-VIS spectrophotometer.
  2. The products are market-oriented and exported to many countries in the world.
  3. Perfect sales system, efficient and fast after-sales service.
  4. On-time delivery rate reaches 100%.
  5. High-cost performance.

FAQ

We are a factory and can provide OEM services using the customer’s brand. The standard warranty is one year; extensions to the warranty period can be negotiated separately.

We could provide Online instruction; Real-time support by video call or voice chat; During warranty time, we can send product accessories when you need them for free; Technical guidance is free and ready forever.

The Kjeldahl method measures nitrogen content. Protein content is then calculated using an appropriate nitrogen-to-protein conversion factor according to the sample or test method.

DW-K9840: 3–6 min/sample
DW-ATN-300: 3–7 min/sample
DW-K1160: 3–8 min/sample

Selected Drawell Kjeldahl analyzers specify nitrogen recovery of ≥99.5%, including the DW-K9840, DW-ATN-300, DW-K9860 and DW-K1160.

Yes. Samples must normally be digested before Kjeldahl distillation. Drawell offers digestion systems with 4, 8, 12 or 20 positions, as well as 20-position graphite heating systems for higher-throughput laboratories.

Yes. The DW-K1160 can be paired with a 24-position autosampler for unattended batch analysis.

DW-ATN-100 – semi-automatic routine analysis
DW-ATN-300 / DW-K9840 – automatic distillation
DW-K9860 – automatic distillation + titration
DW-K1160 – fully automatic system with titration, 21 CFR Part 11/GMP functions and optional 24-position autosampler

Please provide:

Sample Type
Expected Nitrogen / Protein Range
Solid or Liquid Sample
Daily Sample Quantity
Need Automatic Titration or Not
Required Test Standard

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