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OR-KNA 100 fully-automatic Kjeldahl nitrogen analyzer
The Kjeldahl method is a century-old standard for nitrogen determination. The OR-KNA 100 shows how Chinese manufacturers are automating the process to reduce human error and boost throughput in quality control labs.
The OR-KNA 100 is a fully-automatic Kjeldahl nitrogen analyzer that handles the entire workflow—acid and alkali addition, distillation, titration, and data logging—without manual intervention. Its core function is to measure nitrogen content in food, feed, fertilizer, and environmental samples, typically to calculate protein levels.
Key specifications reveal an emphasis on precision. The instrument delivers a recovery rate above 99.5% and repeatability within a relative standard deviation of 0.5%. Titration accuracy is down to 0.01 microliters per step, enabled by a three-color photometric detection system using red, green, and blue primaries. This allows real-time monitoring of the distillation and titration process.
Operational safeguards are built in. The system monitors distillation flask temperature, cooling water flow, and pressure, halting operations if parameters deviate. A dual-level liquid control prevents dry heating, and the safety door must be closed before the machine will run. These are practical design choices for high-throughput labs where attention is divided.
The unit stores up to 10,000 test plans and can export data via USB or wireless transmission. An optional permission classification function aligns with GMP 21 CFR Part 11 requirements for data traceability, making it suitable for regulated industries like pharmaceutical quality control.
The adoption of ABS engineering plastics for the chassis and corrosion-resistant internal piping with a three-year warranty points to a design philosophy that prioritizes durability over aesthetics. This is tooling built for continuous operation in demanding environments, not for the showroom.
China’s role here is not in fundamental method innovation, but in system integration and cost-effective automation. The OR-KNA 100 represents the kind of reliable, standards-compliant lab equipment that enables domestic food safety testing and export-oriented manufacturing to scale without compromising analytical rigor.
The machine does not replace the chemist—it replaces the tedium. That is where industrial efficiency gains are found.
Why it matters:
For labs processing hundreds of nitrogen samples daily, the OR-KNA 100 eliminates variable timing and manual titration errors. Its data traceability features also simplify audit compliance—a growing requirement in supply chains serving Western markets.
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