Leici ZDY-502 Karl Fischer Moisture Titrator

Overview

The Leici ZDY-502 Karl Fischer Moisture Titrator is a dual-mode benchtop analytical instrument engineered for precise and reliable quantitative determination of water content in solid, liquid, and gaseous samples across pharmaceutical, chemical, petrochemical, food, and polymer industries. It implements both coulometric and volumetric Karl Fischer (KF) titration methodologies—fully compliant with ISO 8533, ASTM E203, and USP —enabling trace-level (down to 0.1 mg) and macro-level (up to 250 mg) moisture quantification within a single platform. Unlike optical or gravimetric alternatives, the ZDY-502 relies on stoichiometric iodine generation (coulometric mode) or standardized KF reagent delivery (volumetric mode), ensuring high specificity for water without interference from solvents, acids, or common excipients. Its modular architecture supports method-driven operation, minimizing analyst dependency while maintaining full traceability under regulated environments.

Key Features

• Dual-mode operation: Switch seamlessly between coulometric (for samples with ≤1% water) and volumetric (for higher water content or heterogeneous matrices) titration protocols via intuitive menu navigation.
• Integrated safety engineering: Equipped with a spill-resistant titration vessel, reagent containment housing, anti-backflow waste bottle assembly, and automated solvent/reagent mixing—eliminating direct user contact with toxic KF reagents (e.g., iodine, sulfur dioxide, pyridine-free solvents).
• Intelligent fluid handling: Fully automated sample introduction, titrant dosing, endpoint detection, post-titration rinsing, and system purging—all programmable per method to reduce carryover and cross-contamination.
• Multi-unit reporting: Results exportable in mg, mg/L, % (w/w), ppm, or µg H₂O—configurable per analysis batch to align with internal SOPs or regulatory submission formats.
• Robust data governance: Built-in GLP-compliant memory stores up to 200 complete test records—including sample ID, operator ID, date/time stamp, method parameters, raw titration curves, and final result—with password-protected access and export via USB or RS232.
• Extended operational resilience: Non-volatile memory preserves method settings and calibration data during power interruption; real-time battery-backed clock ensures timestamp integrity.

Sample Compatibility & Compliance

The ZDY-502 accommodates diverse sample types—including hygroscopic powders (e.g., APIs, excipients), viscous liquids (e.g., silicone oils, resins), and volatile solvents—through customizable sample preparation modules (optional oven coupler, gas extraction kit, or homogenizer interface). All measurements adhere to internationally recognized validation frameworks: repeatability (±0.5% RSD) meets ISO/IEC 17025 criteria for routine QC testing; electronic record retention supports FDA 21 CFR Part 11 requirements when used with validated PC software. The system is certified for CE marking and conforms to IEC 61010-1 safety standards for laboratory electrical equipment.

Software & Data Management

The included Windows-based titration control software provides full remote operation, method library management, real-time titration curve visualization, and automated report generation (PDF/CSV). Audit trail functionality logs all user actions—including method edits, result overrides, and calibration events—with immutable timestamps and operator identification. Data export complies with LIMS integration protocols (ODBC-compatible), and raw files retain native resolution for retrospective reprocessing. Firmware and application updates are delivered via secure USB media—no internet connection required—to maintain air-gapped network compliance in GMP facilities.

Applications

• Pharmaceutical QC: Quantification of residual moisture in lyophilized drugs, tablet granules, and packaging headspace per ICH Q5C guidelines.
• Polymer manufacturing: Monitoring water content in PET, nylon, and polyurethane precursors to prevent hydrolytic degradation during extrusion.
• Battery electrolyte analysis: Detection of sub-ppm water in LiPF₆ solutions critical for SEI layer stability.
• Fuel quality assurance: ASTM D6304-compliant testing of water in diesel, jet fuel, and biodiesel blends.
• Food ingredient certification: Verification of moisture specifications in milk powder, starches, and dried fruits per AOAC 955.03.

FAQ

Does the ZDY-502 support both coulometric and volumetric KF titration in one instrument?

Yes—the ZDY-502 is a hybrid platform with switchable titration modes, allowing users to select the optimal method based on expected water concentration and matrix complexity.
Is the instrument compatible with non-pyridine KF reagents?

Yes—its fluidic design and electrode configuration are validated for modern pyridine-free reagents, including imidazole- and amine-based titrants.
Can measurement data be exported directly to an enterprise LIMS?

Yes—via RS232 or USB, the ZDY-502 supports ASCII-formatted data streaming and ODBC-compliant database insertion using the supplied software driver.
What GLP features are implemented in the onboard firmware?

User authentication, electronic signatures for result approval, automatic timestamping, immutable method versioning, and full audit trail logging—including failed login attempts and parameter modifications.
Is oven heating integration available as an option?

Yes—an optional heated sample oven module (ZDY-OV100) enables controlled thermal release of bound water from solids prior to KF titration, extending applicability to crystalline hydrates and adsorbed moisture.