Introduction
A Kjeldahl analyzer is a laboratory instrument used to determine the nitrogen content of organic materials, such as food, feed, fertilizers, soil, and biological samples, using the Kjeldahl method, which is a classical and widely accepted method for protein and nitrogen determination. The Kjeldahl method consists of three main steps: digestion, in which the sample is heated with concentrated sulfuric acid and a catalyst, such as copper or selenium compounds, to convert the nitrogen in the sample into ammonium sulfate; distillation, in which the digested solution is made alkaline with sodium hydroxide and the ammonia is distilled off and collected in a receiving solution; and titration, in which the amount of ammonia is determined by titration with a standard acid solution, and the nitrogen content is calculated from the titration result, and it is converted to protein content by multiplying by a factor, such as 6.25 for many foods. Kjeldahl analyzers may be manual systems with separate digestion, distillation, and titration units, or fully automated systems that combine the steps, and they are used in the food and feed industry for protein determination, in agriculture for fertilizer and soil analysis, in environmental laboratories for wastewater analysis, and in research laboratories for biological samples. Features include precise control of digestion conditions, automated distillation, and accurate titration. With their established methodology and reliability, Kjeldahl analyzers are essential instruments for nitrogen and protein analysis.
Kjeldahl Analyzer LKA-T2010
Kjeldahl Analyzer is capable to measure nitrogen content ranging from 0.1 mgN to 200 mgN, covering nitrogen concentrations from 0.1% to 99%. It features a microcomputer-controlled system...
Semi-T20utomatic Kjeldahl Analyzer LKA-T2010
Semi-Automatic Kjeldahl Analyzer features measuring range from 0.1 mg to 240 mg allow for the analysis of samples with varying quantities of nitrogen content. It analyzes with a capacity...
Fully Automatic Kjeldahl Analyzer LKA-T2013
Fully Automatic Kjeldahl Analyzer measures nitrogen in the 0.1 to 210 mgN range and delivers fast analysis within 4 to 6 minutes. It has a large control system for stability. The analyze...
Fully Automatic Kjeldahl Analyzer LKA-T2012
Fully Automatic Kjeldahl Analyzer is capable of measuring the nitrogen content in a range of 0.1mg to 240mg N. It can be paired with a 24-position autosampler for an advanced operation t...
Fully-T20utomatic Kjeldahl Analyzer LKA-T2011
Fully-automatic Kjeldahl Analyzer is a compact and fully automated unit, adopted with distillation and titration function based on classic Kjeldahl nitrogen determination method, offers ...
Semi-T20utomatic Kjeldahl Analyzer LKA-T2020
Semi-Automatic Kjeldahl Analyzer is equipped with advanced 4.3 inch screen, automatic fault detection system and intelligent audible and visual alarm system. With features such as automa...
Kjeldahl Analyzer LKA-T2010
Kjeldahl Analyzer is a complete microcomputer controlled user-friendly automatic device integrating distillation and titration functions. It is compatible with 42 mm digestion tubes and ...
Fully-T20utomatic Kjeldahl Analyzer LKA-T2010
Fully-automatic Kjeldahl Analyzer conducts titration and distillation simultaneously so as to neutralize the ammonia gas released which enhance the test efficiency and avoid the overflow...
Standards
ISO 1871:2009-Food and feed products-General guidelines for the determination of nitrogen by the Kjeldahl method
Complies with the above standards, but is not limited to them.
Features
1. Kjeldahl analyzer for automatic determination of nitrogen and protein content.
2. Automated digestion and distillation system for efficient, reproducible Kjeldahl analysis.
3. Suitable for food, agricultural, pharmaceutical, environmental and quality control laboratories.
4. Includes digestion unit, distillation unit, titration and analysis software.
5. Supports protein content calculation from nitrogen determination per standard methods.
FAQ
Q1: What testing scenarios is this analyzer mainly applied to?
A: The Kjeldahl analyzer is used in food testing laboratories, agricultural research, pharmaceutical quality control, environmental monitoring, feed analysis and quality control departments to automatically determine the total nitrogen and protein content of samples using the Kjeldahl method. It supports protein content analysis in food products (meat, dairy, grain, beverages), agricultural crop and feed nutrition evaluation, pharmaceutical raw material testing, environmental nitrogen determination, and fertilizer analysis. The automated system performs digestion, distillation and titration with minimal operator intervention, improving throughput, consistency and safety compared with manual Kjeldahl methods. It is essential for food, agricultural, pharmaceutical and environmental laboratories requiring accurate nitrogen and protein determination for nutritional labeling, quality control, regulatory compliance, agricultural assessment, fertilizer analysis and research, where protein content is a critical quality parameter for food products, feed, agricultural materials and pharmaceuticals, and where automated analysis provides reliable, reproducible results with improved safety and efficiency.
Q2: What standards does the analyzer comply with?
A: The Kjeldahl analyzer follows ISO 8968 for milk and milk products nitrogen, ISO 1871 for food and feed, AOAC methods, ASTM methods, and relevant GB/T standards including GB 5009.5 for food protein. The hardware complies with IEC 61010 laboratory safety standards. Calibration should use certified reference materials (e.g., ammonium sulfate, EDTA) traceable to international standards.
Q3: What is the warranty period for the whole machine and key components?
A: The whole analyzer including digestion, distillation and titration units is covered by a 12-month warranty. The heating elements, pumps, sensors and controller are covered, while digestion tubes, reagents, catalysts and tubing are consumables excluded from warranty. Damage from improper reagent use or unauthorized repair is excluded. Extended service contracts are available.
Q4: Is this device difficult to operate? Is professional training required?
A: Operation requires trained analysts familiar with Kjeldahl method, chemical safety and instrument operation. We provide structured training, operation manuals and application support. Proper sample preparation, digestion parameters, reagent handling, distillation and titration setup are important for accurate, safe nitrogen determination.
Q5: What is the typical lead-time for order delivery?
A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.
Q6: Is regular calibration required? What is the recommended calibration cycle?
A: Calibration with certified reference materials (ammonium sulfate, EDTA) recommended before each analytical batch and fully verified every 1-3 months. Digestion temperature calibration every 6-12 months. Titration accuracy verification periodically. Reagent quality checked regularly. Daily performance verification with a control sample recommended for regulated laboratories.
Q7: Are supporting consumables universal?
A: Digestion tubes, catalysts, reagents, sodium hydroxide, boric acid and titrant are available from chemical and laboratory suppliers, though instrument-specific tubes and parts should be verified. Long-term consumable and reagent cost depends on sample volume.
Q8: Can I customize parameters or supporting accessories?
A: Customization includes number of digestion positions, automation level, titration configuration, fume extraction and software features. Additional tubes, racks and accessories can be ordered separately. Custom orders extend delivery lead-time.
Q9: Does the purchase include on-site installation and commissioning service?
A: Yes, Kjeldahl analyzers include on-site installation, commissioning, calibration and operator training by certified application specialists. Site preparation guidance is provided before delivery to ensure fume extraction, power, water and drainage requirements are met.
Q10: What types of samples are compatible with this equipment?
A: The Kjeldahl analyzer determines nitrogen in solid, semi-solid and liquid samples including food, feed, agricultural materials, pharmaceuticals, environmental samples and fertilizers within the method range. Samples with high fat or nitrate content may require special handling. Very large sample volumes may exceed digestion tube capacity. Users should follow proper sample preparation and homogenization, use appropriate catalyst and digestion parameters for the sample matrix, ensure complete digestion, handle concentrated acids and bases safely, use certified reference materials for calibration verification, and calculate protein content using the appropriate conversion factor for the sample type per the applicable standard method.
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