Hanon T931 Coulometric Karl Fischer Moisture Analyzer

Overview

The Hanon T931 Coulometric Karl Fischer Moisture Analyzer is a high-precision, fully automated analytical instrument engineered for trace and macro-level water quantification in solid, liquid, and gaseous samples using the coulometric (electrogenerative) Karl Fischer principle. Unlike volumetric KF titration—which relies on standardized reagent delivery—the T931 generates iodine electrochemically at the anode via controlled current, enabling direct stoichiometric correlation between charge passed (Coulombs) and water consumed (1 mole I₂ ≡ 1 mole H₂O). This method delivers exceptional sensitivity down to 0.093 µg H₂O and linear dynamic range spanning six orders of magnitude (10 µg to 200 mg H₂O per sample), making it suitable for pharmaceutical excipients, hygroscopic APIs, petrochemicals, polymers, lithium battery electrolytes, and food-grade oils where ultra-low moisture specification (e.g., <10 ppm) is critical for stability, safety, or regulatory compliance.

Key Features

• Fully automated coulometric titration with real-time current-controlled iodine generation across nine selectable electrolysis currents (1–400 mA), dynamically optimized per sample moisture load to maximize speed and precision.
• 10-inch capacitive TFT touchscreen running a deterministic Android-based OS—designed for laboratory durability and intuitive operation mirroring consumer-grade tablet UX, including swipe navigation, pinch-to-zoom curve inspection, and context-sensitive parameter editing.
• Integrated closed-loop reagent management system: needle-puncture septum compatibility, auto-reagent exchange without opening the titration cell, and heated transfer lines to prevent vapor condensation—minimizing atmospheric moisture ingress and reducing cell equilibration time by >40% versus conventional open systems.
• Four endpoint determination algorithms: relative drift stop, absolute drift stop, timed termination, and delay-based logic—enabling robust analysis of volatile, viscous, or matrix-interfering samples (e.g., solvents with high ketone content, silicone oils, or ethanol-containing formulations).
• Comprehensive safety architecture: overflow-proof waste reservoir, magnetic stirrer with manual/automatic mode selection, modular reagent bottle holder accommodating 250/500/1000 mL bottles, and integrated air pump for headspace carrier gas (0–200 mL/min, ±2 mL/min accuracy).
• Regulatory-ready firmware: full 21 CFR Part 11 compliance including immutable audit trail (timestamped operator actions, method edits, result approvals), four-tier role-based access control (Super Admin, Supervisor, Operator, IT), enforced password policies (complexity rules, expiration, aging), and cryptographic electronic signatures.

Sample Compatibility & Compliance

The T931 supports direct analysis of homogeneous liquids (e.g., acetonitrile, methanol, hydrocarbons), solids (tablets, powders, films) via optional oven-coupled accessories (T9301 heater or T9340 40-position autosampler), and gases via permeation or flow-through cells. Its coulometric design eliminates reagent standardization drift, ensuring consistent accuracy across batch runs—critical for GLP/GMP environments. The instrument meets ISO 8533:2017 (determination of water in petroleum products), ASTM D6304 (standard test method for water in petroleum products by coulometric KF), USP , and EP 2.5.12. All firmware and data handling protocols are validated for use in regulated pharmaceutical QC labs requiring documented evidence of data integrity, traceability, and change control.

Software & Data Management

Embedded 8 GB flash storage retains methods, raw curves (E-t, drift), final reports, calibration logs, and audit records. Data export supports CSV, Excel (.xlsx), and PDF formats—with embedded metadata (operator ID, timestamp, instrument serial, method version). USB host port enables peripheral connectivity (keyboard, mouse, external printer); RS232 and BNC interfaces support legacy lab network integration; Wi-Fi module allows remote status monitoring and wireless thermal/inkjet printing. Automatic backup executes on method save, result confirmation, and scheduled intervals; UVC-compliant USB backup ensures long-term archival. Built-in help system includes contextual tooltips, step-by-step setup wizards, and searchable digital manual—all accessible offline.

Applications

• Pharmaceuticals: Residual solvent verification in lyophilized products, moisture content in inhalation powders (per ICH Q5C), and water activity assessment in sterile injectables.
• Petrochemicals: Quantification of trace water in jet fuel (ASTM D6304 Class II), transformer oil (IEC 60814), and biofuels—where water >20 ppm accelerates corrosion and oxidation.
• Electronics: Moisture screening in Li-ion battery cathode/anode slurries and separator films—directly impacting cycle life and thermal runaway risk.
• Food & Cosmetics: Water determination in emulsions (creams, lotions), dehydrated herbs, and low-moisture confectionery—ensuring microbial stability and texture consistency.
• Polymers & Composites: Monitoring moisture in epoxy resins prior to curing, where residual H₂O causes void formation and interfacial delamination.

FAQ

What is the detection limit for water using the T931?
The instrument achieves a theoretical detection limit of 0.093 µg H₂O (equivalent to ~5 ppb in a 20 mL solvent blank), validated per ASTM D6304 Annex A1.
Can the T931 measure bromine value and bromine index?
Yes—it supports dual-mode operation: coulometric water analysis and potentiometric bromine titration (Br₂ generation), with specified ranges of 0–300 g Br/100 g (bromine value) and 0–1000 mg Br/100 g (bromine index), accuracy ±3% ±0.2 mg Br.
Is method validation support available?
The system includes IQ/OQ documentation templates aligned with ASTM E2500 and EU GMP Annex 15; full validation services (including performance qualification under simulated production loads) are offered by Hanon’s certified application engineers.
How does the T931 ensure data integrity during power interruption?
All ongoing titrations are checkpointed every 2 seconds; upon recovery, the instrument resumes from last stable state with full audit trail continuity—no data loss or manual reconstruction required.
What accessories are required for solid sample analysis?
For non-volatile solids, the T9301 heated headspace sampler (50–300 °C, ±1 °C stability) or T9340 40-position autosampler is recommended; both feature insulated transfer lines and programmable multi-step temperature ramps to ensure complete water release without degradation.