Hanon K1100/K1100F Fully Automated Kjeldahl Nitrogen Determinator

Overview

The Hanon K1100 and K1100F are fully automated Kjeldahl nitrogen determinators engineered for precision, safety, and regulatory compliance in routine and high-throughput laboratories. Based on the AOAC- and ISO-standardized Kjeldahl method—comprising digestion, distillation, and titration—the system automates all critical steps without manual intervention. The instrument quantifies total nitrogen content via steam distillation of ammonium sulfate under alkaline conditions, followed by acid-base titration of liberated ammonia. This principle remains the globally accepted reference for protein determination across food, feed, agricultural, environmental, and pharmaceutical sectors. Unlike semi-automated systems, the K1100/K1100F integrates real-time thermal monitoring of distillate temperature, adaptive steam generation control, and dual-mode distillation (standard and gentle), enabling robust handling of diverse matrices—from high-fat dairy samples to volatile fertilizer extracts—while maintaining strict adherence to USP , AOAC 981.10, ISO 5983-1:2009, and GB/T 6423–2022.

Key Features

• Fully automated workflow: automatic alkali/acid addition, steam distillation, back-titration, waste discharge, rinsing of digestion tubes and titration cups, calibration verification, and result calculation
• ARM-based embedded control system with 7-inch full-color capacitive touchscreen interface; preloaded with validated method templates for food, feed, soil, and clinical applications
• Intelligent steam generator with adjustable output and real-time distillate temperature sensing—halts operation if outlet temperature exceeds safe thresholds (e.g., >35 °C), preventing ammonia loss and ensuring stoichiometric accuracy
• Dual distillation mode: standard (for rapid analysis) and gentle (to suppress foaming or volatilization in sensitive samples such as fish meal or urea-rich fertilizers)
• High-precision peristaltic dosing pump and linear-motor-driven micro-titration system delivering 1.0 µL resolution and sub-microliter reproducibility
• Integrated safety architecture: interlocked safety door, digestion tube presence detection, condenser water flow monitoring, reagent level sensors, steam generator overtemperature cutoff, and automatic digestion tube emptying post-distillation
• K1100F-specific enhancements: Φ42 mm digestion tube compatibility (matching international standards including Buchi and Gerhardt formats), simultaneous distillation-and-titration operation reducing cycle time by up to 30%, and expanded onboard storage for 1,800 analytical methods

Sample Compatibility & Compliance

The K1100/K1100F accommodates solid samples up to 5 g and liquid samples up to 20 mL, supporting heterogeneous matrices including cereals, meat products, milk powder, animal feed, sewage sludge, compost, and pharmaceutical excipients. Its ≥99.5% nitrogen recovery rate meets AOAC performance criteria for method validation. All operational logs—including reagent consumption, distillation duration, titrant volume, temperature traces, and fault events—are timestamped and stored locally with audit-trail capability. While not natively 21 CFR Part 11 compliant out-of-the-box, the system supports export of CSV-formatted raw data and method parameters for integration into LIMS or validated electronic lab notebooks. It conforms to IEC 61010-1 for laboratory equipment safety and EN 61326-1 for electromagnetic compatibility.

Software & Data Management

The embedded software provides intuitive navigation through a hierarchical menu structure optimized for GLP environments. Users can create, duplicate, rename, and password-protect analytical methods; assign operator IDs; and define pass/fail criteria for nitrogen content and %RSD. Each analysis generates a comprehensive report including sample ID, date/time, digestion batch, distillate volume, titrant consumed, calculated %N and %protein (using customizable conversion factors), and system status flags. Data export is supported via USB port (FAT32-formatted drives only); no network connectivity or cloud services are implemented, preserving data sovereignty. The K1100 stores up to 1,000 method records; the K1100F extends this to 1,800—sufficient for multi-departmental deployment without external database dependency.

Applications

Validated for use in accredited testing laboratories performing nitrogen analysis per official methods: AOAC 981.10 (crude protein in foods), ISO 5983-1 (animal feeding stuffs), ISO 1871 (cereals and milled products), EPA Method 350.1 (wastewater total Kjeldahl nitrogen), and ASTM D5133 (lubricating oils). Routine applications include quality control of wheat gluten content, formulation verification of compound feeds, regulatory compliance testing for organic fertilizer labeling, and research-grade nitrogen balance studies in agronomy and nutrition science. The system’s repeatability (±0.5%) and low detection limit (0.1 mg N) support both QC screening and R&D-level quantification where trace-level precision is required.

FAQ

What digestion units are compatible with the K1100F?
Only F-series digestion tubes with outer diameter Φ42 mm are supported—ensuring mechanical and thermal interoperability with SH220F, SH420F, S402, and WD03 digesters.

Does the system require external cooling water supply?
Yes. A continuous flow of deionized or tap water at ≥1.5 L/min and stable pressure (0.1–0.3 MPa) must be supplied to the condenser inlet; no recirculating chiller is integrated.

Can method files be transferred between K1100 and K1100F instruments?
Method parameters are backward-compatible, but K1100F-specific features (e.g., simultaneous distillation/titration mode) will be disabled when loaded onto a K1100 unit.

Is preventive maintenance documentation available in English?
Yes. Hanon provides bilingual (Chinese/English) service manuals, calibration protocols, and spare parts catalogs upon request to authorized distributors.

What is the expected lifetime of the titration electrode and steam generator heating element?
Under normal usage (≤100 analyses/week), the pH electrode typically requires replacement every 12–18 months; the stainless-steel steam generator cartridge has a service life exceeding 5,000 cycles with proper descaling.