Hanon K1160 + K1124 Fully Automated Kjeldahl Nitrogen Determination System

Overview

The Hanon K1160 + K1124 Fully Automated Kjeldahl Nitrogen Determination System is an integrated, regulatory-compliant solution for quantitative nitrogen and protein analysis based on classical Kjeldahl methodology. It combines a high-precision distillation-titration unit (K1160) with a 24-position autosampler (K1124) to deliver end-to-end automation—from sample loading and reagent addition to steam distillation, back-titration, calculation, and data export—without manual intervention. The system operates on the principle of acid digestion followed by alkaline distillation under controlled steam flow, condensation in a metal cold trap, and potentiometric titration of liberated ammonia with standardized boric acid and HCl. Engineered for precision, reproducibility, and audit readiness, it meets the fundamental requirements of ISO 8968, AOAC 981.10, ISO 1871, USP , and FDA 21 CFR Part 11 for electronic records and signatures.

Key Features

• Fully automated workflow: sequential addition of dilution water, NaOH, boric acid receiving solution; programmable distillation delay; steam generation with 0–100% adjustable flow control; real-time condensate temperature monitoring; auto-emptying of digestion tubes and receiving cups.
• Simultaneous distillation and titration with variable-speed titration (up to 40 mL/min), reducing total cycle time by up to 33% compared to conventional sequential operation.
• Android-based 10-inch HD capacitive touchscreen interface with intuitive UI, offline method editing, and real-time titration curve visualization for dynamic protocol optimization.
• Triple-resolution titration module (0.2 / 0.4 / 1.0 µL/step) ensures high accuracy across low- and high-nitrogen matrices, supporting detection down to 0.1 mg N with RSD ≤0.5%.
• Metal cold condenser system reduces cooling water consumption by 50% while maintaining consistent condensate temperature (<15 °C), critical for quantitative recovery of volatile nitrogen species.
• Integrated K1124 autosampler connects directly via CAN bus—no external power supply required—featuring segregated wash and analysis positions to eliminate cross-contamination during unattended 24-sample runs.
• Comprehensive data governance: role-based user access (administrator, analyst, reviewer), password aging policy, full electronic audit trail, and secure local storage (8 GB SSD, up to 1 million datasets).

Sample Compatibility & Compliance

The K1160+K1124 accommodates diverse sample types—including solids (≤5 g), liquids (≤20 mL), slurries, and digested homogenates—across food, feed, agricultural soils, environmental sludge, pharmaceutical excipients, and polymer matrices. Its robust steam management and optimized condensation ensure reliable quantification of total nitrogen, crude protein (N × 6.25), ammoniacal nitrogen, volatile basic nitrogen (VBN), nitrate-N (after reduction), cation exchange capacity (CEC), and acrylonitrile in synthetic rubber. The system conforms to GLP and GMP environments through built-in 21 CFR Part 11 compliance features: electronic signatures, immutable audit logs, data integrity controls, and exportable PDF/CSV reports traceable to instrument ID, operator, timestamp, and method version.

Software & Data Management

The embedded Android OS supports local method development, 15 preloaded application templates (e.g., dairy protein, cereal N, soil total N), and storage of up to 1,000 custom methods. All experimental parameters—including steam ramp profiles, titration thresholds, and calculation formulas—are fully configurable and version-controlled. Data are stored locally with automatic timestamping and operator attribution. Optional cloud connectivity enables encrypted synchronization of methods, results, and QC records to a secure SaaS platform—extending archival capacity indefinitely while preserving chain-of-custody integrity. USB, LAN, RS232, CAN, and Wi-Fi interfaces support integration into LIMS and enterprise QA/QC workflows.

Applications

This system serves as a primary nitrogen quantification platform in accredited laboratories performing routine quality control and regulatory testing. Key use cases include: protein content verification in dairy, meat, and plant-based products per AOAC 981.10; crude protein assessment in animal feed formulations; total nitrogen determination in fertilizers and compost per ISO 13878; ammonium and nitrate analysis in wastewater and soil extracts; VBN monitoring in seafood freshness evaluation; and nitrogen-bound additives in pharmaceutical APIs. Its wide linear range (0.1–240 mg N), high recovery (>99.5%), and minimal operator dependency make it suitable for high-throughput contract labs and academic research facilities alike.

FAQ

Does the K1160+K1124 support method validation per ICH Q2(R2)?
Yes—the system provides full parameter logging, raw titration curves, intermediate values (e.g., blank-corrected volume, steam pressure), and electronic audit trails required for analytical procedure validation.
Can the K1124 autosampler be used with other Hanon digestion systems?
No—the K1124 is engineered exclusively for CAN-based communication with the K1160; it does not support standalone or third-party controller integration.
Is remote monitoring possible without cloud subscription?
Local network (LAN/Wi-Fi) access allows real-time status viewing and report export via browser-based interface; cloud functionality requires optional service activation.
What maintenance intervals are recommended for the metal condenser and titration pump?
Condenser cleaning every 200 runs; titration pump calibration and tubing replacement every 6 months or 1,000 cycles—both tracked automatically in the service log.
How is data backup handled during power failure?
The system uses non-volatile memory for active method and result buffers; all completed analyses are written to SSD before cycle termination, preventing data loss.