Automatic Kjeldahl Analyzer with Distillation and Titration DW-K9860

DW-K9860 Automatic Kjeldahl Analyzer is an automatic device integrating distillation and titration functions designed based on classic Kjeldahl nitrogen determination method. It’s equipped with the latest core control system, powerful automatic degree and high-quality components, can easily achieve automatic cleaning of digestion tubes and titration cups, control steam supply and have real-time detection of condensation temperature. High-accuracy charging pump and titration system ensure test results accuracy, and multiple fluid level detection gives a smooth test process.

  • ≥99.5% Nitrogen Recovery
  • 3–6 min/sample Distillation
  • 0.1–240 mg N Measuring Range
  • Solid ≤6 g / Liquid ≤16 mL
K9860 Brochure

Features

  1. High accuracy dozing and working: adopt 4 KNF pumps work for dozing, measurement liquid volume.
  2. Easy Maintenance: Pre-install functions of cleaning, including receiving cup cleaning, alkali pipeline cleaning, boric acid pipeline cleaning, acid washing, and steam bottle evacuation. support customer to make the routine maintenance easily.
  3. High titration accuracy, up to 2.0μL/step.
  4. Integrated printer on the instruments.

Characteristics

  1. Automatic cleaning ensure operator safety and save time.
  2. External titration cup design gives operator real-time control of the whole test process.
  3. Steam flow is controllable, satisfying different test requirements.
  4. Regent barrel enjoys fluid absence warning function, ensuring smooth test going.
  5. High-precision charging pump and titration ensure test results accuracy.
  6. The temperature of distilled liquid is detected real time. If the temperature of distilled liquid is abnormal, to ensure the accuracy of experiment’s result, instrument will stop working.

Applications of the Kjeldahl Method

Food and Agricultural Product Testing

Food and Agricultural Product Testing1
Food and Agricultural Product Testing2

Feed Industry Quality Control

Feed Industry Quality Control1
Feed Industry Quality Control2

Agricultural and Environmental Monitoring

Agricultural and Environmental Monitoring1
Agricultural and Environmental Monitoring2

Pharmaceutical and Chemical Research

Pharmaceutical and Chemical Research1
Pharmaceutical and Chemical Research2

FAQ

There is no automatic endpoint detection; judgment relies on color change of boric acid absorbing solution. Continue distilling for 5–10 minutes after the absorbing solution turns from purplish red to blue-green. Lift the condenser tube out of the liquid surface and distill for another 2 minutes to wash residual ammonia on the tube wall and avoid low results. Extend distillation time for samples high in protein and fat.

  1. Inconsistent manual addition of alkali solution in each test, leading to variable ammonia release;
  2. Unstable steam supply due to fluctuating heating flame;
  3. Large human visual error as the titration endpoint is judged by naked eyes;
  4. Loose sealing of digestion tubes, causing minor ammonia escape;
  5. Manual reading deviation of the burette.

Rinse condenser tubes and gas guide tubes repeatedly with distilled water after each test. Soak blocked pipelines in 5% dilute hydrochloric acid to dissolve crystals, then rinse thoroughly with clean water. Do not leave alkali or boric acid solution inside pipelines during test intervals. Drain all liquid from pipelines if the instrument will be stored for a long time.

  1. Replace low-purity sulfuric acid, sodium hydroxide and boric acid with guaranteed-grade reagents;
  2. Pre-calcine digestion tubes at high temperature to remove residual nitrogen-containing impurities;
  3. Use ultrapure water for the whole experiment instead of tap water with many impurities;
  4. Fully clean receiving flasks and glassware with acid to eliminate nitrogen residues that interfere with testing.

Use methyl red-bromocresol green mixed indicator. The endpoint is reached when the solution turns stable gray-purple from blue-green without fading within 30 seconds. Shake the absorption flask gently during titration, and add titrant drop by drop slowly near the endpoint. Operate under sufficient light to reduce errors caused by color vision difference.

Specifications of Automatic Kjeldahl Analyzer with Distillation and Titration DW-K9860

Measuring range0.1mg ～200mg N
Analysis time5～10min/sample
ReproducibilityAverage value relative error ±0.5%
Recovery≧99.5%
Burette volume2.0μL/step
Sample capacitysolid≦5g/sample, liquid≦20mL/sample
Water consumption in the distillation process1.5L/min
Data storage capacity1000 groups
Power supply220VAC±10%, 50Hz
Power2Kw
Net weight38Kg
Dimensions455mm×391mm×730mm
ItemK1100FK9860K9840
AutomaticYYN
Measuring range0.1mg～200mg N0.1mg～200mg N0.1mg～240mg N
ReproducibilityAverage value relative error±0.5%Average value relative error±0.5%Average value relative error±0.5%
Recovery≥99.5%≥99.5%≥99.5%
Sample capacitysolid 5g/sample, liquid 20mL/samplesolid 5g/sample, liquid 20mL/samplesolid 5g/sample, liquid 20mL/sample
Water consumption in the distillation process1.5L/min1.5L/min1.5L/min
Data storage1800 groups1000 groups—
Burette volume1.0μL/step2.0μL/step—
Analysis time3-8min/sample5～10min/sample—
Power supply220VAC±10%, 50/60Hz220VAC±10%, 50/60Hz220VAC±10%, 50/60Hz
Power2KW2KW1.3KW

FunctionK1100FK9860K9840
Steam Flow AdjustmentYYN
Steam modelYNN
Digestion tube dischargeYNN
Digestion tube cleaningYNN
Reagents bottle liquid level monitorYNN
Receiving cup cleaningYY–
Burette calibrationYY–
Data outputY (optional)NN
Method storageYYN
Boric acid pipeline cleaningYYN
Alkali pipeline cleaningYYY
Safety DoorYYY
Digestion tube on position monitorYNY
Condensing water flow monitorYYY
Water level monitorYYY
Steam generator temperature overload protectionYYY
Steam generator pressure overload protectionYNN
Liquid level monitor for Alkali/ acid/ Distilled water bottleYNN

Y: with this function.

N: without this function.

-: without this hardware configuration.

Model Selection and Configuration Recommendations:

  1. If Need Kjeldahl Method with Digester, you can choose DW-SH220F  or  SH420F;
  2. Digestion process completed by DW-SH220F Kjeldahl Digester or SH420F Kjeldahl Digester;
  3. Heavy Metal Digestion can choose SH230N Heavy Metal Digester;

Why Choose Us?

One-Station Shopping

“Multiple suppliers” have always been an issue in the procurement process. Drawell as a one-stop laboratory equipment and scientific instruments supplier, can perfectly solve this problem. In addition to manufacturing our own equipment, we also represent other laboratory equipment. Our product lines are rich and diverse at competitive prices. Provide one-stop service to customers.

Customer-centric Services

User Training – Training by Drawell skilled engineers about installation, debug tests, technical services, etc. It can happen in our factory in China, or at the site in the customers’ country. Cost depends on where and when the training happens.

Online Support

To discuss the problem and get it resolved, online chats, real-time video calls, and remote guidance. For the after-sales stage, our online technical guidance is free and ready forever.

100% Quality Guarantee Policy

1 year free official warranty, including repairing quality-damaged parts, and offering replacements of selected parts (shipping cost is extra). 5% of the product price is charged for extending the warranty before the end of the official warranty.

Other Kjeldahl Nitrogen Analyzer