HOGON AKF-CH6 Coulometric Karl Fischer Moisture Titrator for Stearyl Acrylate
| Brand | HOGON |
|---|---|
| Origin | Shanghai, China |
| Manufacturer | Yes |
| Country of Origin | China |
| Model | AKF-CH6 |
| Measurement Principle | Coulometric Karl Fischer Titration |
| Heating Temperature Range | Up to 140 °C (adjustable) |
| Detection Limit | < 1 µg H₂O |
| Typical Analysis Time | ~7 min per sample |
| Compliance | GLP-compliant data handling, ASTM E203, ISO 8533, USP <921>, EP 2.5.12 |
Overview
The HOGON AKF-CH6 is a purpose-engineered coulometric Karl Fischer moisture titrator designed specifically for the accurate and robust quantification of trace water in challenging organic monomers—most notably stearyl acrylate. Unlike conventional volumetric or coulometric instruments intended for liquid, miscible, or low-viscosity samples, the AKF-CH6 integrates a temperature-controlled heating furnace, sealed carrier-gas delivery, and a fully automated coulometric titration cell into a single, unified platform. Its operational principle relies on the electrochemical generation of iodine via Faraday’s law within a closed anolyte/catholyte system, enabling precise stoichiometric determination of water down to sub-microgram levels. The instrument addresses a well-documented analytical bottleneck in fine chemical and polymer manufacturing: the tendency of stearyl acrylate—due to its high melting point (~45–55 °C), limited solubility in common KF solvents (e.g., methanol, chloroform), and propensity to form colloidal aggregates upon direct injection—to cause clogging, electrode fouling, and non-stoichiometric reaction kinetics. By thermally volatilizing water *in situ* under inert nitrogen flow and delivering only the vapor phase to the titration cell, the AKF-CH6 eliminates solid-phase interference while preserving quantitative recovery.
Key Features
- Integrated programmable heating furnace (ambient to 140 °C, ±0.5 °C stability) with sealed vial cradle and automated needle-puncture mechanism
- Coulometric detection based on I₂ generation at the anode, compliant with ASTM E203 and ISO 8533 for trace moisture (<10 ppm)
- Carrier gas control system with mass-flow regulated nitrogen (0–100 mL/min, adjustable in 1 mL increments)
- Auto-blank subtraction, real-time water mass calculation (µg), and automatic conversion to % and ppm units
- GLP-compliant audit trail: timestamped method parameters, raw current/time curves, operator ID, and result history stored locally with export via USB or RS232
- Sealed double-compartment titration cell with Pt generator and indicator electrodes, optimized for low-background drift and rapid endpoint stabilization
Sample Compatibility & Compliance
The AKF-CH6 extends reliable coulometric moisture analysis beyond classical KF-soluble matrices. It accommodates solid, semi-solid, high-melting, and reactive substances—including stearyl acrylate, polyolefins, nylons, epoxy resins, isocyanates, acid anhydrides, pharmaceutical APIs, metal catalysts, and mineral powders—without solvent compatibility constraints or derivatization. All thermal and gas-handling protocols are validated per ICH Q2(R2) guidelines for method suitability. Data integrity meets FDA 21 CFR Part 11 requirements when paired with optional network-enabled software (e.g., HOGON LabLink Pro), supporting electronic signatures, role-based access control, and immutable record retention. Instrument calibration verification follows USP and EP 2.5.12 protocols using certified water standards (e.g., 1.00 mg H₂O/ampoule).
Software & Data Management
The embedded firmware supports method-driven operation with up to 20 user-defined methods, each storing heating profile, gas flow rate, stirring speed, and endpoint sensitivity settings. Raw coulometric current vs. time datasets are retained with 100-ms resolution. Export formats include CSV (for LIMS integration), PDF reports (with embedded chromatograms), and XML (for enterprise QA systems). Optional PC software enables remote monitoring, batch report generation, statistical process control (SPC) charting (e.g., X-bar/R charts), and compliance-ready audit logs aligned with ISO/IEC 17025 laboratory accreditation criteria.
Applications
- Quality control of acrylate monomers in adhesive and coating formulation
- Moisture specification verification for polymer-grade stearyl acrylate prior to free-radical or ATRP polymerization
- Stability-indicating testing of hygroscopic catalysts and initiators
- Release testing of pharmaceutical excipients and active ingredients per USP
- Moisture mapping in high-value specialty chemicals where <500 ppm tolerance is mandated
FAQ
How does the AKF-CH6 prevent clogging during stearyl acrylate analysis?
It avoids direct sample introduction entirely; instead, water is thermally liberated from the solid matrix and transported as vapor via inert carrier gas—eliminating physical contact between undissolved material and the titration cell.
Can the heating temperature be adjusted for other high-melting-point samples?
Yes—the furnace temperature is fully programmable from ambient to 140 °C in 0.1 °C increments, allowing optimization for waxes, fatty acids, or crystalline polymers.
Is the system compatible with regulatory submissions (e.g., FDA, EMA)?
When operated with validated methods and enabled audit-trail software, it satisfies data integrity requirements of 21 CFR Part 11, Annex 11, and ICH M7.
What maintenance is required for long-term coulometric accuracy?
Routine maintenance includes weekly anolyte replacement, quarterly electrode polishing, and annual calibration verification using certified water standards—documented in the included Maintenance Log template.
Does the instrument support multi-user environments with access control?
Yes—via optional LabLink Pro software, which enforces password-protected user roles (Operator, Supervisor, Administrator) and logs all critical actions with digital signatures.
