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凯氏定氮仪

Automatic Kjeldahl Nitrogen Analyzer KN680

The Kjeldahl method involves converting nitrogen-containing organic compounds into inorganic nitrogen in the form of ammonium sulfate for detection. The measured nitrogen content is then multiplied by a specific conversion factor to determine the protein content. This method is designated as the current national standard for protein content determination in foods and is also an internationally accepted assay method. The KN680 Kjeldahl Nitrogen Analyzer is a fully automated nitrogen distillation system designed based on the principles of the Kjeldahl method, and it can be used for the determination of nitrogen or protein content.

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阿尔瓦凯氏定氮仪-仪器展示

Alva Showcase

Curved Safety Door
The curved safety door is sleek and elegant, with easy opening and closing, enhancing both the overall aesthetics of the machine and the user experience.
Sample Holder
The sample holder features a safety-oriented design for simple operation. Press down with your hand to directly insert the sample, ensuring stability and security.
Full Touchscreen Operation
It is equipped with a 10-inch 16-bit true-color touch LCD, paired with the intuitive SmartOneKey interface for easy one-touch testing.
Data Printing
Experimental results can be printed with a single click, making the process convenient and efficient.
Distillation Fluororubber Head
ALVA uses high-quality fluororubber raw materials and advanced manufacturing processes. The head is resistant to high temperatures and aging, reducing consumable costs.
External Plugs and Switches
ALVA selects premium materials to enhance both the safety of the product and its overall visual appeal.

精雕细琢工艺

Automatic Kjeldahl Nitrogen Analyzer KN680

参数展示

Determination range: 0.1-250mgN (milligram nitrogen)
Determination speed: 3-8min/sample
Titration accuracy: rough titration 1μl/step, fine titration 0.016μl/step
Repeatability: relative error ≤0.3%
Recovery rate: more than 99.5% (1-250mgN)
Automatic titration: color end point judgment method in accordance with AOAC standards
Data storage: >100,000 sets
Program storage: >10,000
Distillation time length: 1-9999min
Steam power level: 1%-100%
Sample amount for determination: solid ≤5g, liquid ≤25ml
Circulating water flow: 1.5 L/min

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阿尔瓦凯氏定氮仪-技术优势

Alva technological

The KN series automatic Kjeldahl nitrogen analyzer adopts the industry-leading 16-bit three-primary color sensor, high-precision fuzzy search titration end point determination technology, and advanced titration system structure to ensure more accurate titration. The unique alkali pump anti-crystallization technology completely eliminates the alkali pump crystallization problem and improves the reliability of the instrument.

Detection Automation

The in-position detection of Kjeldahl tube, acid addition, alkali addition, distillation, titration, digestion tube emptying, receiving cup overflow detection, waste discharge and cleaning, data storage, result calculation and print output are all completed automatically without manual intervention; manual control is also available after suspension.
Sample Anti-bumping

Original sample dilution and alkali addition method, which can arbitrarily set the alkali addition and dilution links in batches, times and time periods according to different user samples, to prevent sample bumping to the greatest extent and improve the determination accuracy.
Alkali Pump Anti-crystallization

Original alkali pump anti-crystallization technology, which completely eliminates the alkali pump crystallization problem and maximizes the reliability of the instrument.
Steam pre-addition technology

steam is introduced immediately after adding dilution water to the digestion solution, and the concentrated sulfuric acid in the digestion solution is fully diluted by the stirring effect of steam, reducing the reaction intensity when concentrated alkali is added subsequently and improving the distillation effect;
Dual-mode Titration

Adopt dual-mode titration, the combination of rough and fine titration ensures high accuracy of results.
Accurate End Point Judgment

End point color fine-tuning technology for users to ensure the adaptability of precise testing, reflecting more humanistic care.
Intelligent Control

Adopt a 10-inch 16-bit true color touch LCD, combined with the SmartOneKey operation interface which is simple and easy to use, realizing one-key testing in the true sense.
Safety Protection

The modular structural design and multiple safety protections greatly ensure the stability and reliability of the product, the accuracy of results, and the safety of operators and the instrument.

凯氏定氮仪适用标准

Applicable standards

It is used for the analysis of protein and total nitrogen in food, agricultural products, aquatic products, environmental samples and pharmaceuticals, as well as distillation analysis of other volatile components.

	Applicable Standards	KN Series Kjeldahl Nitrogen Analyzer
GBT 5511-2008	Cereals and pulses - Determination of nitrogen content and calculation of crude protein content - Kjeldahl method
GB 5009.5-2010	Determination of protein in foods
GBT 5009.44-2003	Method for analysis of hygienic standard of meat and meat products - Volatile basic nitrogen
GBT 18868-2002	Rapid determination of moisture, crude protein, crude fibre, crude fat, lysine and methionine in feeds by near infrared reflectance spectroscopy
GBT 6432-1994	Method for the determination of crude protein in feeds
GBT 8088-2008	Raw natural rubber and natural rubber latex - Determination of nitrogen content
GBT5511-2008	Cereals and pulses - Determination of nitrogen content and calculation of crude protein content - Kjeldahl method
GBT8572-2010	Determination of total nitrogen content for compound fertilizers - Titrimetric method after distillation
GBT 22923-2008	Determination of nitrogen, phosphorus and potassium in fertilizers by automatic analyzer
GBT10511-2008	Determination of total nitrogen content for nitrophosphate fertilizers - Titrimetric method after distillation
GBT17767.1-2008	Determination of organic-inorganic compound fertilizers - Part 1: Total nitrogen content
NY/T295-1995	Determination of cation exchange capacity and exchangeable bases in neutral soil
LY/T1243-1999	Determination of cation exchange capacity in forest soil
HJ 717-2014	Soil quality - Determination of total nitrogen - Kjeldahl method