Leici SFK-503V Karl Fischer Volumetric Moisture Titrator

Overview

The Leici SFK-503V is a fully automated volumetric Karl Fischer titrator engineered for precise and reproducible determination of trace to moderate moisture content in solid, liquid, and gaseous samples across pharmaceutical, chemical, petrochemical, and polymer laboratories. Based on the standardized coulometric and volumetric electrochemical principle defined in ASTM E203 and ISO 760, the instrument quantifies water via stoichiometric reaction between iodine, sulfur dioxide, methanol, and water in anhydrous solvent—where iodine is delivered from a standardized KF reagent via precision burette dosing. Unlike coulometric systems, the SFK-503V employs volumetric titration, making it optimal for samples with water content ranging from 0.1 mg to 250.0 mg per analysis, balancing sensitivity, speed, and operational robustness for routine QC environments.

Key Features

• 7-inch high-resolution color LCD touchscreen with intuitive graphical interface supporting both English and Chinese language modes
• Integrated solvent management system featuring anti-leak fluid pathways and anti-siphon waste bottle design to prevent reagent backflow and operator exposure
• Automated fluid handling: programmable reagent delivery, titration cell purging, stirring activation, post-titration cleaning, and electrode rinsing—minimizing manual intervention and KF reagent contact
• Multi-mode operation: standard KF titration, KF titer calibration, oven-coupled measurement (compatible with KSH-01 sample heating oven), oven blank subtraction, and sequential batch analysis
• Triple-tier user access control with password-protected administrator, supervisor, and operator roles—enabling audit-ready role-based permissions per GLP/GMP requirements
• Real-time potential monitoring (0–2000 mV range, 1 mV resolution) with adaptive endpoint detection algorithms to ensure consistent stoichiometric endpoint recognition

Sample Compatibility & Compliance

The SFK-503V accommodates diverse sample matrices—including hygroscopic powders, viscous oils, solvents, polymers, and pharmaceutical excipients—via direct injection, oven coupling, or headspace sampling. When paired with the optional KSH-01 heating oven, thermally labile or low-volatility samples (e.g., APIs, battery electrolytes, or filled capsules) are dried at controlled temperatures (up to 250 °C), and evolved moisture is swept into the titration cell using dry carrier gas. The system complies with Good Laboratory Practice (GLP) guidelines through mandatory electronic audit trails, time-stamped method logs, user-identity-tagged results, and tamper-evident data storage. All measurement records include full metadata: date/time, operator ID, method name, sample ID, reagent batch, titer value, drift correction, and raw potential curve—supporting FDA 21 CFR Part 11 readiness when deployed with validated PC software and networked authentication infrastructure.

Software & Data Management

• Onboard storage for up to 200 complete test records, each retaining full analytical context (method parameters, raw curves, endpoint flags, and statistical summaries)
• Direct data export via USB flash drive in CSV or PDF format—compatible with LIMS integration and external QA review workflows
• RS-232 port supports connection to serial printers for immediate hardcopy reporting; USB port enables bidirectional communication with Windows-based Leici KF Analysis Suite for advanced report generation, trend analysis, and method validation documentation
• Configurable result units: mg, mg/L, % (w/w), ppm (w/w), µg, and µg/L—automatically calculated based on sample mass/volume input and reagent titer
• Drift compensation algorithm corrects for ambient moisture ingress during titration pauses, improving accuracy for low-moisture samples (<1 mg)

Applications

The SFK-503V is routinely deployed in quality control laboratories for moisture verification of active pharmaceutical ingredients (APIs), excipients, and finished dosage forms per USP and Ph. Eur. 2.5.12. It supports raw material release testing in fine chemical manufacturing, residual solvent analysis in polymer synthesis, and specification compliance for lithium-ion battery cathode/anode materials where moisture below 20 ppm can trigger HF formation. In petrochemical QA, it validates drying efficiency of transformer oils (IEC 60814) and verifies moisture limits in jet fuels (ASTM D6304). Its repeatability ≤0.5% (for >10 mg water) and 1 µg resolution make it suitable for method transfer studies and stability-indicating assays requiring intermediate-precision assessment under ICH Q2(R2).

FAQ

What types of Karl Fischer titration does the SFK-503V perform?
It is a volumetric Karl Fischer titrator, utilizing pre-standardized iodine-containing reagents dispensed via motorized burette. It is not a coulometric system.
Is the instrument compatible with external sample ovens?
Yes—it natively supports the Leici KSH-01 heating oven for automated oven-coupled moisture determination with integrated temperature ramping and gas flow control.
How is data integrity ensured for regulated environments?
Through GLP-compliant features including electronic signatures, immutable audit trails, user-authenticated access levels, and timestamped method/result archiving—all exportable for regulatory inspection.
Can the SFK-503V be integrated into a laboratory network?
While the device lacks built-in Ethernet/Wi-Fi, its USB and RS-232 interfaces enable seamless integration with centralized LIMS or ELN platforms using Leici’s certified communication drivers and validated PC software.
What maintenance routines are recommended for long-term reliability?
Daily electrode cleaning with methanol, weekly solvent replacement in the titration vessel, quarterly calibration of burette delivery volume, and annual verification of polarization current stability per manufacturer service protocol.