Nittoseiko Analytech CA-200 Coulometric Karl Fischer Moisture Analyzer

Overview

The Nittoseiko Analytech CA-200 is a high-precision, single-channel coulometric Karl Fischer moisture analyzer engineered for trace-level water quantification in demanding analytical laboratories. It operates on the fundamental electrochemical principle of coulometric titration, where iodine—generated in situ via controlled electrolysis of iodide ions—is stoichiometrically consumed by water in the sample according to the classic Karl Fischer reaction: I₂ + SO₂ + H₂O + 3RN + CH₃OH → 2RN·HI + RN·HSO₄CH₃. Unlike volumetric KF systems, the CA-200 delivers superior sensitivity and reproducibility for samples containing ≤100 mg of water per analysis, making it ideal for pharmaceutical excipients, lithium battery electrolytes, organic solvents, and high-purity polymers. Its microprocessor-controlled pulse electrolysis current (430 mA nominal) ensures stable iodine generation and minimizes over-titration artifacts. The instrument’s real-time background correction algorithm continuously monitors and subtracts ambient drift (displayed as µg H₂O/sec), enabling reliable detection down to 0.1 µg H₂O with certified precision of ±3 µg across the 10 µg–1 mg range.

Key Features

• Coulometric detection mode optimized for ultra-trace moisture (10 µg–100 mg H₂O), eliminating reagent standardization and reducing operational variability.
• Intelligent background compensation system with continuous µg/sec drift monitoring and automatic baseline correction.
• High-resolution 5.7-inch color LCD interface supporting multilingual menus (English, Japanese, Chinese), intuitive navigation, and real-time titration curve visualization.
• Dual-mode operation: Simple Mode for routine single-formula calculations and Composite Mode supporting up to 10 preconfigured formulas plus 2 user-defined equations, with flexible unit selection (e.g., %, ppm, mg/kg, µg/g).
• Integrated 21-pin dot-matrix printer (58 mm paper width) with timestamped output including date, time, sample ID, result, method ID, and operator code.
• GLP-compliant architecture featuring electronic signature support (via optional PC software), full audit trail logging, and memory backup retention (>2 months on full charge).
• Expandable connectivity: RS-232 port for computer integration (optional), USB interface for data export and firmware updates, and dedicated I/F for certified analytical balances enabling auto-weight import.

Sample Compatibility & Compliance

The CA-200 accommodates a broad spectrum of solid, liquid, and gaseous samples through standardized KF cell configurations and optional accessories (e.g., oven samplers, gas diffusion cells). It meets critical regulatory expectations for quality control environments: raw material release testing (ICH Q5, USP ), stability studies (ICH Q1), and battery electrolyte certification (IEC 62660-1). Its firmware supports full GLP documentation requirements—including operator authentication, method version control, and instrument calibration history—and is compatible with 21 CFR Part 11–compliant data management platforms when deployed with validated software extensions. All internal diagnostics (display test, printer verification, memory integrity check, and KF reaction validation) are accessible via the built-in self-test menu.

Software & Data Management

Data integrity is maintained through hierarchical storage: 100 most recent analyses are retained in volatile memory, while 20 standard and 50 composite method files reside in non-volatile flash memory. Each record stores raw titration data, calculated moisture content, statistical summaries (mean, SD, RSD), and metadata (date/time stamp, operator ID, balance weight, method parameters). USB export enables CSV or proprietary binary format transfer to LIMS or Excel-based QA review workflows. Optional PC software provides advanced reporting templates, trend analysis across batches, and electronic signature capture for audit readiness. The system logs all critical events—including method changes, calibration actions, and user logins—with timestamps traceable to the internal real-time clock (RTC).

Applications

• Pharmaceuticals: Quantification of residual moisture in lyophilized APIs, excipients (e.g., lactose, mannitol), and sterile packaging headspace.
• Electrochemical Materials: Water determination in LiPF₆-based electrolytes, cathode precursors, and separator films—critical for battery cycle life and safety.
• Petrochemicals: Trace moisture analysis in hydrocarbon solvents, transformer oils, and aviation fuels per ASTM D6304 and IP 386 protocols.
• Polymers & Composites: Monitoring moisture in engineering resins (e.g., polyamide, PEEK) prior to injection molding or extrusion.
• Food & Flavorings: Verification of low-water activity in dehydrated ingredients and essential oil carriers.

FAQ

What is the minimum detectable water mass using the CA-200?
The instrument achieves a detection limit of 0.1 µg H₂O under optimal conditions, verified using certified anhydrous standards and calibrated micro-syringes.
Can the CA-200 be upgraded to dual-channel operation?
Yes—the hardware platform supports field-upgradeable dual-channel configuration via authorized service installation and firmware update.
Does the CA-200 support bromine index/bromine number analysis?
Yes—dedicated Bromine Index/Bromine Number modes are embedded, utilizing modified KF chemistry with bromide-containing reagents and corresponding calculation algorithms.
Is temperature-controlled sample introduction available?
While the base CA-200 does not include integrated heating, it is fully compatible with external programmable oven samplers (e.g., Nittoseiko AO-200) supporting stepwise thermal desorption profiles.
How is data security ensured during USB export?
Exported files are write-protected binary archives; plain-text CSV exports require explicit user confirmation and retain no embedded metadata unless enabled via PC software configuration.