NK9870A Fully Automatic Kjeldahl Analyzer

The Kjeldahl method is a classic technique for determining nitrogen.

It is widely used for the measurement of nitrogen in soil, food, livestock, agricultural products, feed, and other nitrogen-containing compounds. The process for sample analysis using this method involves three main steps: sample digestion, distillation and separation, and titration analysis.

Our company is one of the creators of the national standard GB/T 33862-2017 for "Fully (Semi) Automated Kjeldahl Nitrogen Analyzer." Therefore, the Kjeldahl analyzer series products we develop and manufacture comply with both the GB standard and relevant international standards.

One-touch automation: reagent addition, temperature control, cooling water control, sample distillation and separation, sample titration analysis, data storage and display, digestion tube waste discharge, analysis waste discharge, titration cup cleaning, and completion prompt.

★ Patented technology “electronic cooling circulation system” allows for a fully automatic Kjeldahl nitrogen analyzer without the need for tap water, saving energy, being environmentally friendly, and providing high condensation efficiency.

The control system features a 10-inch color touch screen for unified control of the nitrogen analyzer and cooling system, eliminating the need for multiple switches or settings, providing convenience, simplicity, and safety.

Three-level authority management, electronic records, electronic labels, and an operation traceability query system meet certification requirements.

★ The standard cooling system saves substantial water resources for users and provides more stable analysis data.

★ The system automatically shuts down after 60 minutes of inactivity, ensuring energy efficiency and safety.

★ A built-in protein coefficient query table allows users to access, query, and participate in system calculations. When the coefficient is 1, the analysis result shows “nitrogen content”; when greater than 1, the result automatically converts to “protein content” for display, storage, and printing.

★ Patented technology adjusts R, G, and B light intensity automatically, suitable for analyzing different sample concentrations.

The titration system uses R, G, and B coaxial light sources and sensors with a wide color adaptation range and high precision.

Titration speed can be set from 0.05 ml/s to 1.0 ml/s, with a minimum titration volume of 0.2 μL/step.

A high-precision titration system combines a German ILS 10mL (optionally 25mL) syringe with a 0.6mm lead screw linear motor.

★ The titrant concentration internal standard eliminates system errors between human and instrument judgment, offering high precision and convenience.

The exposed titration cup allows easy observation of the titration process and cup cleaning.

The simultaneous distillation and titration mode saves analysis time and reduces unnecessary power usage.

Distillation time is freely adjustable from 10 to 9990 seconds.

Steam flow can be adjusted from 1% to 100%, suitable for different sample concentrations.

Automatic discharge of digestion tube waste reduces staff labor intensity.

★ The system automatically cleans alkali pipelines during shutdown to prevent clogging and ensure liquid supply accuracy.

Data storage (16M) can store up to 1 million records for user reference.

5.7cm thermal printer with automatic paper cutting.

RS232, Ethernet, electronic balance, and cooling system data interfaces.

★ Unique feature for automatic uploading of sample weight data, eliminating the need for individual recording and input, reducing errors, and improving efficiency.

★ The splash-proof bottle is made of high polymer PP plastic, suitable for high-temperature, strong acid, and strong alkali conditions.

★ The steam system is made of 304 stainless steel, and liquid level control uses patented technology “separated capacitor liquid level sensor,” ensuring overall safety, reliability, and long lifespan.

★ The condenser is made of 304 stainless steel, providing fast cooling and stable analysis data.

Leakage protection system ensures operator safety.

Safety door and door alarm system ensure personnel safety.

Missing digestion tube protection system prevents accidents involving reagents and steam.

Steam system water shortage alarm triggers automatic shutdown to prevent accidents.

Steam boiler over-temperature alarm triggers automatic shutdown to prevent accidents.

Steam overpressure alarm triggers automatic shutdown to prevent accidents.

Sample overheating alarm triggers automatic shutdown to prevent sample temperature from affecting analysis data.

Reagent bucket and titration bottle low-level alarm.

Cooling water flow monitoring ensures proper flow, preventing sample loss and analysis result errors.