DN3000 Dumas Nitrogen Analyzer Fast Automated Protein Analysis

Product Overview & Technical Description

The DN3000 Dumas nitrogen analyzer delivers rapid, reliable elemental determination across food, agriculture, feed, and chemical testing sectors. Engineered as an automated, high-precision alternative to wet chemistry methods, this combustion nitrogen analyzer utilizes flexible carrier gas options (helium or carbon dioxide) to achieve an ultra-low detection limit of 20 ppm N alongside broad sample versatility up to 1.5 g or 1.5 mL.

High-Efficiency Combustion and Tungsten Reduction

The system incorporates a robust two-stage combustion design combined with an advanced single-stage reduction tube. Innovatively utilizing high-capacity metallic tungsten instead of traditional copper agents, the reactor delivers three times the reduction capacity, drastically reducing consumable wear and lowering the overall cost per analysis. The combustion assembly is mounted on heavy-duty slide rails, allowing operators to perform ash removal on the fly without cooling the furnace, preserving critical laboratory uptime.

Zero-Blank Micro-Ball Valve Sample Injection

Sample loading relies on a magnetically controlled micro-ball valve assembly paired with multi-position autosamplers (60, 80, or 120 positions). The valve executes precise multi-stage rotations, using carrier gas to thoroughly purge ambient air prior to releasing the sample into the combustion zone. This ensures a true zero-blank injection, eliminates nitrogen contamination from ambient air, suppresses mechanical operating noise, and removes the need for auxiliary injection gases.

Three-Stage Dehydration Assembly

Moisture removal occurs via a sequential three-phase moisture separation system. Bulk moisture is captured physically by a Peltier metal condenser, residual moisture is filtered through a maintenance-free selective permeation membrane dryer, and trace moisture is absorbed by chemical desiccant. This cascading architecture protects analytical integrity while drastically minimizing chemical consumable turnover.

Independent Fast-Stabilizing TCD Detection

The analytical core features an independently temperature-controlled Thermal Conductivity Detector (TCD) with feedback precision exceeding 0.1°C. Unlike conventional detectors requiring hours to reach equilibrium, this module reaches its optimal 60°C operating state within 30 minutes, even in unconditioned winter environments. Designed with oxygen-insensitive sensing elements, the detector provides drift-free calibration stability for over a year and measurement precision down to 0.5% RSD.

Technical Specifications

Frequently Asked Questions

1. Can the analyzer operate using carbon dioxide instead of helium?

Yes, the instrument supports both carbon dioxide and helium carrier gases. Using carbon dioxide significantly lowers daily operational costs while maintaining detection sensitivity down to 20 ppm N.

2. How does the tungsten reducing agent compare to standard copper reducers?

Metallic tungsten provides approximately three times the reduction capacity of conventional copper wire, requiring fewer tube repackings and delivering lower consumable costs per sample run.

3. Do operators need to shut down and cool the furnace for ash cleaning?

No, the combustion chamber is built on an ergonomic slide-rail mechanism that allows direct ash removal while the furnace remains hot, preventing hours of operational downtime.

4. How does the micro-ball valve prevent ambient air contamination?

The valve rotates 90 degrees after receiving the sample, purging atmospheric nitrogen with carrier gas before rotating another 90 degrees to drop the sample, ensuring zero-blank injection.

5. How long does the thermal conductivity detector take to stabilize from a cold start?

The detector features a dedicated smart temperature control module that heats and stabilizes the sensor at 60°C in roughly 30 minutes, compared to 3 to 4 hours required by standard systems.

6. Will unexpected oxygen breakthrough damage the TCD sensor?

No, the thermal conductive filament elements are made from proprietary materials engineered to resist oxidation and remain stable even if reduction capacity diminishes.

7. How does the three-stage dehydration system reduce consumable expenses?

The Peltier metal condenser removes bulk water and the permeation membrane eliminates residual moisture without consumables, leaving only ultra-trace moisture for chemical absorption.

8. What sample types and maximum weights can the system process?

The analyzer accommodates heterogeneous solid samples up to 1.5 grams and liquid samples up to 1.5 milliliters across food, feed, fertilizer, and petrochemical applications.

9. What autosampler capacities are available for high-throughput labs?

Laboratories can choose between 60, 80, or 120-position pneumatic autosamplers to match specific testing volumes and enable unattended overnight batch runs.

10. How often does the calibration curve need to be re-established?

The high-stability detection design maintains calibration validity for over a year without baseline drift, requiring only routine verification using standard reference materials.

11. What utility supplies and laboratory conditions are required for installation?

The system requires standard 200–240 VAC power, high-purity oxygen, carrier gas (CO₂ or He), and an exhaust line. Its compact 460 x 460 x 480 mm footprint fits standard lab benches.

12. Does the software integrate with laboratory information management systems (LIMS)?

The Windows-based operating software controls analytical sequences, monitors real-time sensor data, recalculates protein factors, and exports reports directly to external LIMS databases.