Since its establishment, Shanghai Xinzhuang Company has gained widespread recognition for its high-quality products and services, building a strong reputation among customers. The company is committed to the business philosophy of "integrity, professionalism, innovation, and growth," ensuring that every customer receives attentive and reliable service.
**Application Scope**
The Kjeldahl instrument utilizes the Kjeldahl method to analyze various compounds such as ammonia, protein nitrogen, phenol, volatile fatty acids, cyanide, sulfur dioxide, and ethanol in samples like grains, food, feed, water, soil, sludge, sediments, and chemicals. It offers excellent cost-performance, with only the titration process requiring manual intervention. This makes it ideal for routine testing in laboratories and inspection agencies. It is widely used in determining the nitrogen or protein content in food, crops, seeds, soil, and fertilizers.
**Working Principle**
The organic compound is heated with sulfuric acid to convert its nitrogen into ammonium sulfate. Potassium sulfate is often added to increase the boiling point of the mixture. When a small amount of sodium hydroxide is added, followed by distillation, the solution becomes colorless and transparent, indicating the end of the digestion process. The ammonia is then absorbed in boric acid, and the total ammonia content is determined via back titration. Excess acid is neutralized using sodium carbonate, and the results are multiplied by a specific conversion factor to obtain the final nitrogen or protein content.
**Key Features of Kjeldahl Analyzer**
- One-button operation for quick and efficient testing.
- Multilingual menu options for user convenience.
- Optical and acoustic fault alarms to ensure safety.
- Safety door switch and automatic steam generation (40%-100% adjustable).
- Measurement range: 0.1–200 mg.
- Nitrogen recovery rate of 99.5%.
- Repeatability within ±1%.
- Automatic and manual addition of sodium hydroxide.
- RS232 interface for data transfer.
- Condensate consumption of 5 L/min.
**Advanced Control System**
The Kjeldahl nitrogen analyzer uses microcomputer technology for precise process control. It supports both manual and automatic modes. In automatic mode, users can set parameters such as alkali and boric acid volume, distillation time, and absorption duration. Manual mode allows full control over the addition of boron, alkali, and distillation, catering to professional needs.
**User-Friendly Design**
The device features a large dot-matrix LCD screen with a full Chinese menu and touch buttons for easy navigation. It includes automatic distillation control, automatic water supply, water level monitoring, and low water pressure alerts. Multiple safety protections are in place, including a digestive tube safety door and steam generator water shortage alarm. Users can store their operating programs for future use.
Shanghai Xinzhuang Instrument Co., Ltd. specializes in developing and manufacturing solid-phase extraction devices under the Xinzhuang brand. These devices are energy-efficient, environmentally friendly, and designed with precision. The company focuses on product development, upgrades, and innovations, consistently introducing intelligent instruments with excellent performance and stability. To better serve its clients, the company also employs experienced application engineers who are available to provide assistance at any time.
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