Leici ZDY-504 Karl Fischer Moisture Analyzer

Overview

The Leici ZDY-504 Karl Fischer Moisture Analyzer is a dual-mode laboratory instrument engineered for high-reproducibility quantitative determination of water content in solid, liquid, and gaseous samples using both volumetric and coulometric Karl Fischer titration principles. Designed to meet the stringent requirements of quality control laboratories in pharmaceuticals, petrochemicals, polymers, and fine chemicals, the ZDY-504 implements the electrochemical endpoint detection method defined in ASTM E203 and ISO 760—where iodine generated *in situ* via controlled electrolysis (coulometric mode) or delivered from a standardized titrant solution (volumetric mode) reacts stoichiometrically with water. Its dual-method architecture enables seamless transition between macro-level moisture quantification (0.1–250.0 mg) and trace-level analysis (10 µg–20 mg), eliminating the need for multiple dedicated instruments across analytical workflows.

Key Features

• Dual operational modes: fully automated volumetric titration (with 10 mL precision burette) and coulometric titration (with selectable electrolysis current settings: 10, 20, 50, and 100 mA)
• High-resolution mass detection: 0.1 mg resolution for volumetric results; sub-microgram sensitivity in coulometric mode
• Integrated safety architecture: leak-proof reagent delivery system, anti-siphon waste bottle design, automatic rinse cycle, and overflow protection for titration cell
• Multi-unit reporting: supports mg, mg/L, %, ppm, µg/mL, and µg for both volumetric and coulometric outputs—configurable per method
• GLP-compliant data handling: 200 independent result sets stored with timestamp, operator ID, method parameters, and raw titration curves
• Robust titration control: 1/12,000 precision dosing resolution and adjustable polarization voltage (10.722–107.22 mA) for optimized endpoint stability
• Power failure resilience: non-volatile memory preserves method settings and pending measurements during unexpected shutdown

Sample Compatibility & Compliance

The ZDY-504 accommodates diverse sample matrices—including hygroscopic solids (e.g., APIs, excipients), viscous liquids (e.g., lubricants, resins), and volatile solvents—via programmable injection protocols and optional oven coupling (external interface available). All measurement protocols adhere to internationally recognized standards: volumetric mode conforms to USP , EP 2.5.12, and ASTM D6304; coulometric mode satisfies ISO 15512 and ASTM D4928 for trace moisture in hydrocarbons. The instrument’s firmware supports audit trail generation and user-access level management, facilitating compliance with FDA 21 CFR Part 11 requirements when deployed with validated software configurations and networked data archiving.

Software & Data Management

The ZDY-504 operates via embedded firmware with optional PC-based Leici KF Control Suite (Windows-compatible), enabling remote method development, real-time titration curve visualization, and batch report generation. Stored datasets include full metadata: sample ID, method name, titrant concentration (volumetric), electrolysis current setting (coulometric), endpoint potential profile, and statistical summaries (mean, RSD, n=3–6). Data export is supported via RS232 to thermal printers or CSV/Excel-compatible formats for LIMS integration. Firmware and application software are field-upgradable via USB, ensuring long-term adaptability to evolving regulatory expectations and analytical needs.

Applications

• Pharmaceutical QC: Water content verification of active pharmaceutical ingredients (APIs), lyophilized powders, and tablet coatings per ICH Q5C guidelines
• Petrochemical testing: Trace moisture analysis in transformer oils, jet fuels, and LNG condensates per ASTM D1744 and D6304
• Polymers & composites: Residual monomer moisture in PET, nylon, and epoxy resins prior to extrusion or molding
• Food & feed: Quantification of bound water in dairy powders, starches, and animal feed formulations
• Electronics manufacturing: Moisture screening of solder pastes, conformal coatings, and encapsulation resins where <50 ppm H₂O impacts reliability

FAQ

Does the ZDY-504 support both volumetric and coulometric titration in a single instrument?
Yes—the ZDY-504 integrates two independent electrochemical measurement circuits, allowing users to select either mode without hardware modification or recalibration.
What safety features prevent exposure to Karl Fischer reagents?
The system includes sealed reagent reservoirs, automated purge-and-rinse cycles, anti-backflow waste containment, and physical barriers preventing direct contact during operation or maintenance.
Is the instrument compatible with GLP/GMP documentation requirements?
Yes—data storage includes time-stamped, operator-identified records with full method traceability; optional software adds electronic signature capability and audit trail logging per 21 CFR Part 11 Annex 11.
Can measurement units be customized per test method?
Yes—users define output units (e.g., % w/w for solids, ppm for solvents, µg for trace standards) independently for each saved method.
What is the minimum detectable water mass in coulometric mode?
The instrument achieves reliable detection down to 10 µg H₂O, with RSD ≤3% at the 100 µg calibration point under controlled ambient conditions (20–25°C, RH <40%).