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Fully Automatic Kjeldahl analyzer, KJA-9870/KJA-9870A

  1. Analytical range: 0.1—200 mg N
  2. Accuracy  (RSD):≤0.5% (30mgN,0.1mol/L H+)
  3. Recovery rate: ≥99.5%
  4. Titration accuracy: 0.75μL/step
  5. Titrant concentration range: 0.01—5 mol/L

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In line with domestic and international standards, KJA-9870 series fully automatic Kjeldahl Azotometer is an analysis system used for determining nitride in endpoint according to automatic distillation ——color method which is based on classic kjeldah method.

This series has three products  KJA-9870, KJA-9870A and KJA-9870B, which can be selected by different users to meet the needs of different fields such as basic analysis application, technology research and development, and can also be the alternatives of imported products.

Advantages and features

1.Operating system: 7.5-inch color touch screen with man-machine dialogue mode easy to operate, easy to learn.

Titration sensor:choose R, G, B three color sensors, with wide range of color adaptation, high precision and quick response Titration curve:the titration curves of R, G and B can timely observe the changes of samples in the titration process, providing help for the analysis process.

2. Titration pump:the titration system – “plunger titration pump” – is composed of German linear motor and injection needle, which has high control precision and good stability.

3. Titration volume verification:verify the accuracy of titration system to ensure the accuracy of analytical data

4. Protein coefficient query:this instrument contains the protein coefficient query table for users to consult, inquire and participate in the system calculation, which is convenient for users to use.

5.Analysis data storage, query, printing:data storage amounts to 140,000 pieces of sample data for users to check, and the printer is 57mm automatic paper-cutting thermal printer.

6.Modular structure:the patented technology-“modular structure” design- makes the internal layout more reasonable; the simple pipeline distribution greatly reduces the fault caused by pipeline. Easy to maintain and preserve.

7.Refrigerating circulator interface: “refrigerating System” does not need to be operated to open or close. When the azotometer is heated, the “refrigerating system” is automatically turned on to reduce the temperature of it. When the it is not working, the “refrigerating system” automatically shuts down.

8.Ammonia separator (anti-splash bottle): selects the sodium glass material which is resistant to strong alkali corrosion, thoroughly solve the problem of ammonia separator corroding caused by long time soaking in strong alkali

9.Leakage protection system: prevent personal injury caused by electric leakage and electric shock caused by various reasons. Digestive tract absence protection: the system will not add reagents and heat when digestive tract is not yet placed, preventing reagents, steam from hurting people

10.Safety door protection: the system will not work before the door is closed, and the 5mm-thick transparent safety door ensures personal safety

11.Steam system water-shortage protection: when the steam system is short of water, the system will automatically stop, alarm, to prevent accidents.

12.Steam pot over-temperature protection: if the distillation system fails and the temperature in the steam pot is too high, the system will automatically stop and alarm.

13.Safe alkali-adding mode: this mode can reduce the strong neutralization reaction during the alkali adding process and prevent the occurrence of tube bursting.

14.Automatic calibration of titration concentration instrument: it eliminates the systematic error of the difference between man and instrument, with high precision and convenience.

15.Titration while distillation: the mode of simultaneous distillation and titration is to enter the titration process when the volume of sample distillation separation is about 1/3. At this time, the distillation and titration are performed simultaneously, and the distillation will end when the titration reaches the end point.

16.Automatic discharge of digestive waste liquid: a large amount of waste liquid will remain in the digestive tube after distillation.The automatic “waste discharge system” can reduce the labor intensity of workers.

17.Steam flow regulation: adjusts the steam flow from 70% to 100% to apply different concentrations of samples.

18.Automatic cleaning of the alkali pipeline: the system automatically cleans the alkali pipeline every time after it is shut down, preventing the alkali pipeline from being blocked after long time shutdown.

19.Steam over-pressure protection: the pressure measuring alarm system composed of pressure transmitter and CPU, when the system pressure is too high, the system will alarm and stop to prevent accidents.

20.Sample over-temperature alarm: in order to prevent the increase of sample temperature caused by too little cooling water flow and thus affecting the analysis data, the system will alarm when it is over-temped and displays the real-time temperature of the sample.

21.Cooling water flow monitoring: the monitoring system will alarm and stop when the cooling water flow is too small or too large.

22.Refrigerating circulation system: the fully automatic kjeldahl azotometer doesn’t need tap water, and its refrigerating circulation system, which is energy saving, environmentally friendly and has high recovery efficiency of samples, is controlled by its main machine.

23.Operating system of KJA-9870B:its development and design is based on WINDOS10, and the operation page is the same as the main engine’s, hence is convenient and easy to learn.


Model name KJA-9870 KJA-9870A KJA-9870B
Analytical range 0.1—200 mg N
Accuracy  (RSD) ≤0.5%(30mgN,0.1mol/L H+)
Recovery rate ≥99.5%
Titration accuracy 0.75μL/step
Flow accuracy verification of titration pump 10mL/per time ±5‰
Titrant concentration range 0.01—5 mol/L
Titration concentration input mode Manual input Manual input / instrument self-calibration
Titration while distillation miode Standard Standard / Titration while distillation
Titration method linear motor / plunger pump
Total volume of titration cup 220mL
Titration total volume/ per time ≤80mL
Sample analysis time 4-6min/(Cooling water temperature 18℃)
Blank deduction of sample Automatic deduction
User – made recipe 99 groups
Re-add alkali during distillation process 0-99mL/ per time
Fertilizer analysis model (nitro) Reaction time 0-2 hours
Titration cup mounting (removable cleaning) Equipped
Titration curve observation Equipped
Titration cup overflow alarm system Equipped
Data storage 140,000 sets of data
Printer 57CM thermal automatic paper cutting printer
Communication interface Cooling Water

Reagent Level(optional)

232/electronic balance/cooling water/reagent level
Cooling water consumption 1.2L—3L/min
Computer operating software Not applicable WINDOS-10
The digestive tube discharges waste automatically Manual processing Manual processing / Automatic discharge
Steam pressure monitoring and alarm Not applicable 40Kpa
Distillation sample temperature monitoring and alarm Not applicable 50℃
Cooling water flow monitoring and alarm Not applicable 0.8-10L/min
Refrigerating system Not applicable Applicable
Steam flow control Not applicable 70%-100%
Automatic cleaning of alkali pipeline Not applicable Automatic cleaning
Safe alkali adding mode Equipped(0-999 sec)
Steam boiler overtemperature alarm system 120℃
Steam boiler with dry burning-resistant protection Equipped
Safety Gate Switch Equipped
Digestive tube vacancy switch Equipped
Operating voltage AC220V/50Hz
Heating power 2000W
Boundary dimension 500*460*710mm
Net weight 30Kg 36Kg


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    We will usually contact you within 24 hours. You could also call us (+86-531-88982330) during working hours ( 8:30 am to 5:45 pm UTC+8 Mon.~Sat. ) or use the website live chat to get prompt reply.

    Contact Info

    Rm. 2014, Bldg. 3, Ligaoguojihuayuan, No. 1222, West Aoti Road, Lixia District, Jinan, Shandong

    Phone: +86-531-88982330

    Fax: +86-531-88983691


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