Peiou SKD-800 Kjeldahl Nitrogen Determinator

Overview

The Peiou SKD-800 Kjeldahl Nitrogen Determinator is a semi-automatic benchtop analyzer engineered for precise, reliable quantification of total nitrogen content in organic and inorganic samples via classical Kjeldahl digestion and steam distillation methodology. Designed in strict accordance with ISO 8968-1, AOAC 981.10, and ASTM D1142 standards, the instrument implements controlled alkaline hydrolysis followed by quantitative ammonia distillation and titrimetric or colorimetric detection. Its architecture prioritizes analytical integrity—minimizing sample degradation, eliminating back-suction risks, and ensuring stoichiometric completeness throughout the distillation cycle. The SKD-800 serves as a core workflow instrument in food safety labs (e.g., dairy, cereals, meat), agricultural testing centers (fertilizer, soil, feed), environmental monitoring (wastewater sludge, biosolids), and pharmaceutical quality control where nitrogen-to-protein conversion (N × 6.25 or matrix-specific factors) is required under GLP-compliant conditions.

Key Features

• Robust corrosion-resistant construction: Entire chassis molded from industrial-grade ABS engineering plastic—chemically inert to concentrated sulfuric acid, sodium hydroxide, and boric acid vapors.
• Dual-level liquid level monitoring: Real-time detection of distillation water, alkali solution, acid reagent, and diluent volumes; integrated constant-pressure peristaltic dosing ensures volumetric consistency across 100+ programmable distillation protocols.
• Intelligent thermal safety system: Continuous temperature sensing at both distillation flask and condensate collection vessel; automatic pause/resume functionality triggered by thermal thresholds prevents overheating and preserves sample integrity.
• Fail-safe operational logic: Automatic alarm and suspension on coolant flow interruption, low reagent levels, or open safety door; full event logging with timestamped status recovery enables audit-ready traceability.
• Optimized distillation dynamics: Adjustable 1500 W heating power (0–100% linear control) and variable distillate flow rate (15–30 mL/min) ensure high recovery (>99.5%) across wide concentration ranges—from trace nitrogen in purified water matrices to concentrated fertilizer extracts.
• Modular fluidic isolation: Independent circuitry for electrical, pneumatic, and liquid pathways; external reagent reservoirs reduce internal contamination risk and simplify maintenance.

Sample Compatibility & Compliance

The SKD-800 accommodates heterogeneous sample types including solid matrices (≤6 g dry weight) and liquid specimens (≤16 mL volume), compatible with standard Kjeldahl digestion tubes (e.g., 100–300 mL borosilicate glass). It supports regulatory workflows compliant with FDA 21 CFR Part 11 (when paired with validated LIMS integration), EU Regulation (EC) No 853/2004 for food nitrogen labeling, and ISO 14253-1 for measurement uncertainty management. All critical parameters—including distillation time (1–99 min), delay interval (0–1800 s), and alkali addition timing—are fully configurable and stored with user-defined metadata, supporting method validation per ICH Q2(R2).

Software & Data Management

The embedded firmware provides real-time graphical display of process variables (temperature, liquid levels, power output, elapsed time) via a high-contrast LCD interface. Up to 100 customized distillation programs—including preheat, acid/alkali/diluent dosing sequences, and rinse cycles—can be saved locally. Over 1000 sample records are retained with timestamps, operator ID, program name, and final nitrogen mass (mg N). Data export is supported via USB interface for CSV-compatible transfer to laboratory information systems. Audit trail functionality logs all parameter modifications, emergency stops, and reagent refills—enabling full compliance with GLP and GMP documentation requirements.

Applications

• Food & Beverage: Crude protein determination in milk powder, soy isolates, wheat gluten, and infant formula per AOAC Official Method 981.10.
• Agriculture: Total nitrogen analysis in NPK fertilizers, compost, and soil extracts per ISO 11261.
• Environmental: Organic nitrogen load assessment in municipal wastewater, activated sludge, and landfill leachate.
• Pharmaceuticals: Quantitative nitrogen verification in excipients and bulk active ingredients per USP <467> residual solvents guidance.
• Research: Method development for non-standard matrices requiring custom distillation kinetics or multi-step alkali addition.

FAQ

Does the SKD-800 support fully automated digestion?
No—the SKD-800 performs only the distillation and titration-ready ammonia capture step. Digestion must be completed separately using a dedicated block digester or microwave system.
What safety certifications does the instrument carry?
It complies with IEC 61010-1 for laboratory electrical equipment safety and meets CE marking requirements for EMC and low-voltage directives.
Can the SKD-800 integrate with external titrators or spectrophotometers?
Yes—via RS-232 or USB serial emulation, it outputs distilled ammonia volume and endpoint signal triggers compatible with Metrohm, Hanna, and Thermo Scientific titration platforms.
Is remote monitoring or network connectivity available?
Not natively; however, optional USB-to-Ethernet adapters enable file-based data retrieval in networked lab environments.
What maintenance intervals are recommended for long-term reliability?
Internal tubing requires inspection every 12 months; ABS housing and heating elements are rated for ≥5 years continuous operation under standard laboratory conditions (20–25°C, 40–60% RH).