Nittoseiko Analytech CA-310SK Coulometric Karl Fischer Moisture Analyzer

Overview

The Nittoseiko Analytech CA-310SK is a high-precision coulometric Karl Fischer moisture analyzer engineered for trace-level water quantification in hygroscopic and low-moisture-content solid polymers—including engineering plastics, thermoplastics, polyesters, polyamides, and polyolefins. Unlike volumetric KF systems, the CA-310SK employs electrochemical generation of iodine via constant-current electrolysis in an anhydrous methanol-based reagent system, enabling direct, stoichiometric quantification of water at sub-microgram levels without reagent standardization or titrant calibration. Its coulometric architecture delivers inherent accuracy and repeatability for samples containing 5 μg to 999.9999 mg of water—making it particularly suited for QC laboratories validating polymer dryness prior to extrusion, injection molding, or fiber spinning. The instrument operates on the fundamental principle that one mole of iodine reacts with one mole of water (H₂O + I₂ + SO₂ + 3RN + CH₃OH → 2RN·HI + RN·HSO₄CH₃), and measures the total charge (coulombs) required to generate the stoichiometric iodine, thereby calculating water mass using Faraday’s law.

Key Features

• Fully automated coulometric titration with real-time current pulse control and polarized dual-platinum electrode endpoint detection
• Ultra-high sensitivity down to 0.1 μg H₂O, validated per ASTM E203 and ISO 760 standards
• Dynamic background correction algorithm continuously monitors and subtracts ambient drift, ensuring stability during extended analyses
• 8.4-inch full-color capacitive touchscreen interface with intuitive icon-driven navigation and multilingual OS support (English, Japanese, Chinese)
• Integrated magnetic stirrer with adjustable speed and auto-synchronization to titration cycle
• Modular design compatible with Nittoseiko’s full suite of vaporization units (VA-300, VA-200, VA-210, VA-230, VA-236S, VA-121, VA-122, VG-200), all featuring programmable stepwise temperature ramping for controlled thermal desorption of bound moisture
• GLP/GMP-compliant data integrity architecture: electronic signatures, operator ID logging, immutable audit trails, and 21 CFR Part 11–ready configuration options

Sample Compatibility & Compliance

The CA-310SK is optimized for solid plastic granules, pellets, flakes, and powders with low inherent water content (< 0.5% w/w). It supports direct injection into the titration cell or indirect analysis via heated headspace vaporization—critical for thermally labile polymers where direct dissolution may cause degradation. When paired with VA-series vaporizers, the system complies with USP , Ph. Eur. 2.5.12, and JP 17 methods for loss-on-drying cross-validation. All hardware and firmware meet IEC 61010-1 safety requirements; electromagnetic compatibility conforms to EN 61326-1. Full traceability is maintained through time-stamped method parameters, raw current/time profiles, and final calculation logs—essential for regulatory submissions and internal quality audits.

Software & Data Management

Embedded firmware provides comprehensive data handling: 9999 test records are stored locally with metadata (operator ID, sample ID, date/time, method name, reagent lot, environmental conditions). USB and LAN interfaces enable secure export to LIMS or ELN platforms in CSV or XML format. Built-in calculation engine supports multiple reporting formats—% w/w, ppm, mg H₂O/g, absolute μg—and allows post-acquisition reprocessing of titration curves, statistical summarization (mean, SD, RSD, min/max), and batch trend analysis. Password-protected user roles (Operator, Supervisor, Administrator) enforce procedural controls. Firmware updates are delivered via signed package files to preserve cryptographic integrity.

Applications

• Quality control of PET, PBT, PA6, PA66, PC, and POM prior to melt processing
• Validation of desiccant dryer performance in polymer handling lines
• Stability studies assessing moisture uptake kinetics under accelerated aging conditions
• Raw material release testing per ISO 17855 and ASTM D6980
• Failure analysis of hydrolytic degradation in medical-grade polymers
• Supporting ISO/IEC 17025 accreditation documentation for moisture testing competence

FAQ

What sample preparation is required for plastic pellets?
Minimal preparation: pellets should be homogenized, weighed directly into the sample vial (typically 0.1–2 g), and introduced into the titration cell or vaporizer using inert atmosphere gloves if ambient humidity exceeds 50% RH.
Can the CA-310SK analyze moisture in carbon-filled or glass-fiber-reinforced plastics?
Yes—its coulometric method is insensitive to conductive fillers or particulates, provided the sample matrix does not chemically interfere with iodine generation or consume reagent components.
Is method validation support available?
Nittoseiko Analytech provides application notes, IQ/OQ protocols, and certified reference materials (e.g., sodium tartrate dihydrate) aligned with ISO/IEC 17025 clause 7.2.2 for method verification.
How is electrode maintenance performed?
The dual-platinum electrodes feature automated activation cycles triggered via software menu; manual cleaning with ethanol and ultrasonic bath is recommended every 200–300 analyses or when baseline noise exceeds 0.3 μA.
Does the system support networked deployment across multiple labs?
Yes—LAN connectivity enables centralized data archiving, remote diagnostics, and synchronized firmware updates across distributed CA-310SK installations within a corporate QA network.