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K18 Fully Automated Kjeldahl Nitrogen Analyzer, Kjeldahl Distillation and Titration System

Reagent addition, distillation, titration, digestion tube and titration buret waste removing, discharging & washing, calibrating, fault detecting, solution level monitoring、and outcome calculating all can be realized fully automatically. Standard data-processing software (the control software is also optional).
  • K18
  • Sonnen

Technical Authority and Trustworthy


Comply with international / national standard, adopt national standard Kjeldahl method: digest sample in concentrated sulphuric acid environment steam distillation in alkaline environmentboric acid absorptionindicator titration end-point color determination methodadopt international advanced high-precision high-resolution 16-bit tri-phosphor digital signal color sensor determinate titration end-point method(successfully developed in 2005);

Dynamic titration technology (known as distilling while titrating, successfully developed in 2007) could accomplish the distillationtitrationcaculation synchronically.

The visible titration flask make the color change during the titration could be clearly shown.

In 2007, Sonnen successfully developed the unique auto determining module for nitric nitrogen and high nitrogen.

Sonnen is one of the drafters of China’s national standard GB/T22923-2008.

Sonnen is one of the drafters of the China's official standard JJF 109-2012 Calibration Specification for Nitrogen Analyzer.

Sonnen’s branch company successfully applied for innovation fund of Small and Medium-sized Enterprises from the national Ministry of science and technology byIntelligent Automatic Kjeldahl Apparatus, application accepted in 2011 and project acceptance successfully finished in 2014.


Product Feature

Adding acidadding alkali distillationtitrationcalibrationliquid level detectionwaste discharging & washing(digestion tube and titration cup)calculation and print can all be realized fully automatically.

Parameter setting autonomously, match with 35 tubeposition auto sampler, unattended automatic operation.

Whole new multicore ARM operating system, 10-inch high definition color touch LCD screen, realtime monitoring and displaying experimental process.

Multi safety monitoring function. monitoring the safety of safety door, digestion tube, steam pressure, cooling water temperature, distillate temperature, water level of steam generator and lack of water, insure the experiment safe.

Linear motor titration system, 1.0μl titration accuracy, achieve dynamic titration and variable speed titration, could accomplish the distillationtitrationcaculationdata transmission synchronically. the external titration cup with protection real time visible and with anti interference capability.

Multi data output modes. WIFI, RS232/RS485, double USB2.0 interface. data processing by Word, Excel software.

Convenient Windows operating system, Powerful data traceability software, Classified management, operation, Auditing function, Generate comprehensive test and analysis report, Comply with the regulations of “GLP” and “GMP”

Unattended automatic stop self cleaning function.

Titration color can be calibrated automatically or manually. The titration endpoint determined by high accuracy 16-bit three primary color digital signal color sensor.

PTFE(Teflon) bellows pump, acid and alkali resistance and corrosion resistance, Resistance to particle plugging structure, steady liquid addition controled by stepper motor, negative pressure suction without danger.

PTFE(Teflon) splash-proof bottle, resistance to high temperature and strong alkali, no ammonia leakage, ensure high recovery rate.

The liquid level detection of bucket ensure no lack of liquid during experiment.

The K18B apply to ammonium nitrogen and nitrate nitrogen.

The K18C apply to ammonium nitrogen, nitrate nitrogen and high content nitrogen(the sample nitrogen content higher than 45%)

Technical Parameters






General   nitrogen determining module

Both   general nitrogen determining module   and   nitrate nitrogen determining module

Include the determining module for general nitrogennitrate   nitrogen and high nitrogen

Analysis time

3-8 minutes/sample

general   nitrogen: 3-8 min/sample

nitrate   nitrogen:  10-18 min/sample

general   nitrogen: 3-8 min/sample

nitrate   nitrogen:  10-18 min/sample

high nitrogen:  4-8 min/sample

Measuring range

0.1mg-240mg N

0.1mg-280mg N




1% RSD


Distillation capacity

~ 40ml/min

Burette resolution


Sample amount

Solid≤6g            Liquid≤25ml

Steam flow setting

0-100% adjustab

Cooling water consumption(during distillation only)

1.5L/min at water temp of 25

                              0.5L/min at water temp of 15

Data storage capacity

10,000,000 sets of overall test   data(instrument internal storge);

                                      unlimited(cloud storage)

Power Supply

220V  50HZ

Power Consumption



500 X 460 X 780(mm)



Note: Parameters may be updated, please in kind prevail.

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