Behr Micro Kjeldahl Digestion System K16, K24, K40

Overview

The Behr Micro Kjeldahl Digestion System (K16, K24, K40) is a compact, high-efficiency digestion module engineered for precise and reproducible sample preparation in classical Kjeldahl nitrogen determination workflows. Designed in accordance with ISO 8968-1, AOAC 984.13, and ASTM D1142 standards, this system performs the critical acid digestion step—converting organic nitrogen into ammonium sulfate under controlled thermal and chemical conditions. Unlike conventional open-digestion blocks, the Behr Micro series integrates an integrated fume extraction hood with a corrosion-resistant stainless steel housing and chemically inert heating blocks, ensuring operator safety and long-term stability in routine laboratory environments. Each unit operates on a modular principle: digestion occurs in standardized 100 mL borosilicate glass tubes, where concentrated sulfuric acid (with catalysts such as CuSO₄ or Se) mineralizes organic matrices at elevated temperatures (up to 420 °C). The system’s thermal architecture delivers uniform heat distribution across all positions, minimizing inter-sample variance—a prerequisite for achieving the stated repeatability of ±0.5% and nitrogen recovery exceeding 99.5%.

Key Features

• Corrosion-resistant stainless steel construction with electropolished surfaces for resistance to H₂SO₄ vapors and condensates
• Three scalable configurations: K16 (16-position), K24 (24-position), and K40 (40-position) to match throughput requirements
• Precise digital temperature control (range: ambient to 420 °C) with independent PID regulation per heating zone
• Programmable digestion cycles: ten preloaded methods plus user-definable protocols (time: 1–99 min; temperature ramping profiles supported)
• Integrated fume extraction hood with adjustable airflow and connection port for external ducting or recirculating scrubber systems
• One-touch operation interface with multilingual support (English, German, French, Spanish, Chinese)
• Over-temperature protection, dry-run detection, and automatic power cutoff for unattended operation
• Compliance-ready design: supports GLP/GMP documentation via optional audit trail logging (when paired with Behr KjelMaster software)

Sample Compatibility & Compliance

The Behr Micro Kjeldahl Digestion System accommodates a broad spectrum of organic matrices, including but not limited to dairy products, cereals, meat, feedstuffs, soil, wastewater sludge, and pharmaceutical excipients. Its 100 mL digestion tube format ensures compatibility with standard Kjeldahl distillation units (e.g., Behr KjelFlex or Buchi K-375), enabling seamless integration into end-to-end nitrogen analysis workflows. All models are CE-marked and conform to IEC 61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use). The system meets the mechanical and operational prerequisites of ISO 5983-1 and supports method validation under FDA 21 CFR Part 11 when used with compliant data management software. Routine calibration verification can be performed using certified reference materials (CRMs) such as NIST SRM 2384 (wheat gluten) or AOAC 990.11 (casein).

Software & Data Management

While the Behr Micro series operates autonomously via its onboard controller, full traceability and regulatory compliance are achieved through integration with Behr’s KjelMaster LIMS-compatible software suite. This platform enables secure user authentication, electronic signature capture, automated method assignment, real-time monitoring of digestion status, and export of time-stamped logs—including temperature curves, cycle completion timestamps, and error flags. Audit trails comply with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) and support internal QA audits as well as external inspections by regulatory bodies (e.g., USDA, EFSA, or pharmacopeial authorities). Data exports are available in CSV, PDF, and XML formats for inclusion in analytical reports or quality dossiers.

Applications

• Protein content quantification in food and feed according to Codex Alimentarius and EU Regulation No. 1169/2011
• Nitrogen balance studies in agricultural research and fertilizer efficacy testing
• Crude protein determination in animal nutrition formulations (AOAC 984.13)
• Environmental monitoring of total Kjeldahl nitrogen (TKN) in municipal and industrial wastewater (EPA Method 351.2)
• Pharmaceutical raw material qualification per USP <467> residual solvents and compendial nitrogen limits
• Academic teaching labs requiring robust, low-maintenance digestion platforms with minimal infrastructure demands

FAQ

What voltage options are available for the Behr Micro Kjeldahl Digestion System?
The K16, K24, and K40 models are supplied in dual-voltage variants: 230 V~ (50/60 Hz) and 115 V~ (60 Hz), each with model-specific article numbers for unambiguous ordering.
Can the digestion block accommodate alternative tube sizes?
No—the system is engineered exclusively for 100 mL borosilicate digestion tubes (e.g., Pyrex® or Duran® type). Non-standard tube dimensions compromise thermal contact and may trigger safety interlocks.
Is the fume extraction hood compatible with centralized lab ventilation?
Yes. The hood includes a 100 mm diameter exhaust port with flange mounting, designed for direct coupling to standard ductwork operating at 0.5–1.2 m/s face velocity.
How is method validation supported for regulated laboratories?
Each unit ships with a Factory Calibration Certificate traceable to national standards. Users may perform periodic performance checks using CRMs and document results within KjelMaster’s structured validation templates.
Does the system require water cooling or external condensers?
No. The digestion process relies solely on thermal decomposition; no active cooling or reflux condensation is integrated—consistent with modern micro-Kjeldahl methodology.