Peiou SKD-800 Automated Kjeldahl Nitrogen Analyzer
| Brand | Peiou |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | SKD-800 |
| Price Range | USD 1,400 – 7,200 (FOB) |
| Instrument Type | Protein Nitrogen Determinator |
| Measurement Principle | Classical Kjeldahl Method |
| Nitrogen Recovery Rate | >99.5% |
| Repeatability (RSD) | <0.5% |
| Detection Range | 0.08–240 mg N |
| Sample Capacity | ≤6 g solid or ≤16 mL liquid |
| Distillation Time | 1–99 min |
| Adjustable Distillation Power | 1500 W |
| Distillation Flow Rate | 15–30 mL/min |
| Data Storage | 100 pre-programmed methods + >1,000 sample records |
| Cooling Water Requirement | ≥1.5 L/min at ≤20 °C |
| Operating Pressure | ≥0.15 MPa |
| Dimensions (W×D×H) | 370 × 300 × 680 mm |
| Enclosure Material | Molded ABS engineering plastic |
Overview
The Peiou SKD-800 Automated Kjeldahl Nitrogen Analyzer is an integrated, microprocessor-controlled system engineered for precise and reproducible total nitrogen quantification via the classical Kjeldahl digestion–distillation–titration methodology. Designed in strict accordance with ISO 8968-1 (milk), ISO 1871 (cereals), AOAC 981.10 (food), and USP (residual solvents in pharmaceuticals), the SKD-800 delivers regulatory-compliant nitrogen data essential for protein content calculation (N × conversion factor, e.g., 6.25 for most foods). Its fully automated workflow—encompassing acid addition, alkaline hydrolysis, steam distillation, condensate collection, and endpoint detection—eliminates manual intervention while maintaining full traceability per GLP and FDA 21 CFR Part 11 requirements when paired with compliant software. The instrument operates on a constant-pressure steam generation architecture, preventing back-suction into the distillation chamber and ensuring consistent vapor delivery across variable sample matrices.
Key Features
- High-precision fluidic control: Dual-level reagent monitoring (acid, alkali, diluent, cooling water) with real-time level sensing and automatic shutdown on depletion or flow interruption.
- Thermal safety redundancy: Dual liquid-level sensors in the distillation unit plus temperature-triggered cut-off prevent dry-burn conditions; cooling water flow is continuously monitored to halt operation if flow falls below 1.5 L/min or inlet temperature exceeds 20 °C.
- Optimized reaction kinetics: Stepwise alkali dosing ensures controlled exothermic neutralization, minimizing foaming and splashing during digestion residue transfer—critical for viscous or high-fat samples such as dairy concentrates or animal feed extracts.
- Modular hardware design: Independent circuitry, fluid pathways, and gas channels reduce cross-contamination risk and simplify maintenance; external reagent reservoirs enable rapid solvent exchange without internal disassembly.
- Intuitive human-machine interface: 7-inch capacitive color touchscreen with Chinese/English bilingual menu navigation; supports one-touch method launch, real-time parameter visualization (e.g., condensate temperature, steam pressure, titration progress), and on-the-fly alkaline dosage adjustment during distillation.
- Durable construction: Fully molded ABS engineering plastic chassis provides chemical resistance to concentrated H2SO4, NaOH, and H3BO3; internal tubing certified for ≥3 years service life under continuous acidic/alkaline exposure.
Sample Compatibility & Compliance
The SKD-800 accommodates diverse sample types including cereals, legumes, dairy powders, meat homogenates, fermented beverages, soil extracts, fertilizer slurries, and pharmaceutical excipients. Its 0.08–240 mg N detection range supports both low-nitrogen matrices (e.g., purified water used in biopharma buffer preparation) and high-protein materials (e.g., soy isolate, casein). All operational parameters—including digestion time, alkali volume, distillation duration, and steam power—are programmable and auditable. The system complies with ISO/IEC 17025 documentation standards for calibration traceability and meets mechanical safety requirements per IEC 61010-1. When operated with validated methods and calibrated borosilicate glassware, it satisfies reporting criteria for ISO 5725-2 (repeatability) and ISO 11292 (dairy protein certification).
Software & Data Management
The embedded firmware stores up to 100 customizable analytical protocols and retains >1,000 sample result sets with timestamps, operator ID, method version, and raw distillate volume. Data export is supported via USB to CSV or PDF formats compatible with LIMS integration. Optional PC-based software enables remote method deployment, electronic signature capture, audit trail review (including user login/logout, parameter edits, and error logs), and automated report generation aligned with ISO 17025 clause 7.8.2. All stored data are write-protected against unauthorized modification, fulfilling ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available).
Applications
- Food & Beverage QC: Routine protein verification in infant formula, plant-based milks, nutritional supplements, and ready-to-eat meals per Codex Alimentarius standards.
- Agricultural Testing: Total nitrogen assessment in compound feeds, silage, compost, and mineral fertilizers—supporting EU Regulation (EC) No 2003/2003 compliance.
- Pharmaceutical R&D: Quantification of residual ammonium salts in active pharmaceutical ingredients (APIs) and excipients per ICH Q5C guidelines.
- Environmental Labs: Kjeldahl nitrogen analysis in wastewater sludge, sediment cores, and agricultural runoff per EPA Method 351.2.
- Academic Research: Standardized nitrogen budgeting in crop physiology, soil microbiology, and fermentation kinetics studies.
FAQ
What digestion system is compatible with the SKD-800?
The SKD-800 is designed to interface with standard Kjeldahl digestion blocks or infrared digesters (e.g., optional Peiou SKD-20S2 IR digester); no direct coupling is required—the digested sample is manually transferred to the distillation unit.
Does the SKD-800 support automatic titration?
No—the SKD-800 performs automated distillation only; endpoint detection requires external titration (manual or auto-titrator) using boric acid trapping solution and standardized HCl.
Can the instrument be validated for GMP environments?
Yes—when deployed with documented IQ/OQ/PQ protocols, calibrated volumetric glassware, and traceable reference standards (e.g., NIST SRM 84g casein), the SKD-800 meets core validation requirements for pharmaceutical and nutraceutical manufacturing.
Is remote diagnostics supported?
Basic status telemetry (error codes, reagent levels, runtime hours) is accessible via USB log export; Ethernet/Wi-Fi connectivity is not natively integrated but may be added via third-party industrial gateways.
What maintenance intervals are recommended?
Daily: Rinse condenser and waste lines with deionized water. Quarterly: Inspect steam trap seals and replace alkali delivery tubing if discoloration or swelling is observed. Annually: Full calibration verification using certified nitrogen standards and pressure sensor recalibration.
