Automatic Nitrogen Content Tester Supplier

Precise Elemental Analysis with the Automatic Nitrogen Content Tester

Introduction
Nitrogen determination is critical in applications ranging from fuel quality (NOₓ precursor control) to protein analysis in food and feed. The Automatic Nitrogen Content Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. offers both the Dumas combustion method and micro‑Kjeldahl titration in one automated system, delivering high throughput and low detection limits.

Testing Principles

• Dumas Combustion: A weighed sample (0.1–1 g) is combusted in an oxygen atmosphere at 900–1,000 °C. The resulting nitrogen oxides are reduced to N₂, then quantified by thermal conductivity detection.

• Micro‑Kjeldahl: Samples are digested in sulfuric acid with catalysts to convert nitrogen to ammonium sulfate. After neutralization, ammonia is distilled and titrated potentiometrically to determine nitrogen content.

Technical Design Features

• Dual‑Module Configuration: Users select combustion or titration by software; robotic arms transfer samples to the appropriate module.

• High‑Temperature Combustion Furnace: Provides rapid heating and complete oxidation with automated oxygen purge and cleanup cycles.

• Automated Digestion Block & Titrator: Simultaneously digests up to 20 samples and performs sealed‑cell titration with ±0.01 mg resolution.

• Integrated Analytical Balance: Weighs samples directly on the instrument, reducing transfer errors.

• Data Management: LIMS‑compatible output, customizable reports, and audit‑ready logs.

Industry Applications

• Fuel Testing: Monitor nitrogen in ultra‑low sulfur diesel to control NOₓ formation.

• Food & Feed: Determine protein content via nitrogen analysis for nutritional labeling.

• Pharmaceuticals: Verify active‑ingredient purity in nitrogen‑containing compounds.

• Chemical Manufacturing: Control nitrogen in polymer intermediates and specialty chemicals.

Best Practices

1. Sample Homogenization: Grind solids finely (< 0.5 mm) and mix liquids thoroughly to ensure representative aliquots.

2. Reagent Quality: Use high‑purity sulfuric acid and catalysts to avoid blank control issues.

3. Combustion Check: Run oxidation blanks and calibration gases weekly to verify furnace performance.

4. Titrator Maintenance: Replace titrant and clean probes per schedule to maintain endpoint precision.