Lanjing LJ-WS4 Karl Fischer Volumetric Moisture Titrator
| Brand | Lanjing |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Volumetric Karl Fischer Titrator |
| Moisture Range | 0.001% (10 ppm) to 100% |
| Power Supply | AC 220 V ±10%, 50 Hz ±2.5 Hz |
| Data Storage | Automatic storage of up to 1,000 test records |
Overview
The Lanjing LJ-WS4 Karl Fischer Volumetric Moisture Titrator is a fully automated analytical instrument engineered for precise and reproducible determination of trace water content in liquid, solid, and gaseous samples using the volumetric Karl Fischer titration principle. Based on the stoichiometric reaction between iodine, sulfur dioxide, methanol, and water—where one mole of iodine reacts quantitatively with one mole of water—the system delivers high accuracy across a broad dynamic range (0.001% to 100% w/w, equivalent to 10 ppm to full saturation). Designed for compliance with internationally recognized standard methods—including ASTM D6304, ISO 760, GB/T 11133 (petroleum products), GB/T 6283 (chemicals), and Chinese Pharmacopoeia General Chapter 0832 (Method I)—the LJ-WS4 supports regulated laboratory environments requiring documented traceability and method adherence.
Key Features
- Microprocessor-controlled volumetric titration with real-time endpoint detection via dual-platinum electrode polarization, ensuring robust repeatability and minimal operator dependency.
- 7-inch high-resolution color TFT touchscreen (1024 × 600 pixels) with intuitive bilingual interface (English/Chinese), supporting multi-language operation and firmware-upgradable protocols to accommodate evolving pharmacopeial revisions.
- Integrated reagent handling system with automatic burette filling, solvent dispensing, and waste aspiration—reducing manual intervention and cross-contamination risk.
- Electrostatically coated enclosure for chemical resistance and ease of decontamination in QC/QA or GMP-compliant labs.
- Programmable stirring speed control and drift compensation algorithm to stabilize baseline during low-moisture analysis (e.g., solvents, APIs, excipients).
- Onboard calculation engine automatically reports results in multiple units: µg H₂O, ppm, % w/w, mg/L, and normalized to sample mass—accompanied by timestamp, operator ID, and method name.
Sample Compatibility & Compliance
The LJ-WS4 accommodates diverse sample matrices including hydrocarbons, alcohols, ketones, polymers, pharmaceutical raw materials, lyophilized powders, and packaged gases (via optional gas sampling kit). Its design conforms to GLP and GMP documentation requirements: all titrations generate immutable audit trails—including reagent batch numbers, titrant consumption, endpoint potential curves, and environmental conditions (temperature/humidity logs). The instrument supports 21 CFR Part 11–compliant data integrity when paired with validated LIMS integration (via RS-232 or USB virtual COM port). Method validation parameters—including linearity (R² ≥ 0.999), repeatability (RSD ≤ 0.5% at 100–1000 µg level), and recovery (97–103%)—are verifiable per USP <921> and EP 2.5.12 guidelines.
Software & Data Management
Equipped with embedded firmware v3.2+, the LJ-WS4 enables local data retention of 1,000 complete assay records—including raw titration curves, calculated moisture values, statistical summaries (mean, SD, RSD), and user-defined metadata (sample ID, lot number, analyst initials). Data export is supported in CSV format for external statistical analysis (e.g., JMP, Minitab). Optional PC software provides advanced features: method library management, calibration curve generation, electronic signature capture, and automated report generation compliant with ISO/IEC 17025 clause 7.8. All stored entries include time-stamped creation/modification logs, preventing unauthorized data alteration.
Applications
- Quality control of hygroscopic active pharmaceutical ingredients (APIs) and excipients per ICH Q5C stability protocols.
- Moisture verification in lithium-ion battery electrolytes and cathode/anode slurries where residual H₂O induces HF formation.
- Trace water quantification in aviation turbine fuels (ASTM D6304 Class B) and silicone oils used in medical devices.
- Batch release testing of freeze-dried biologics, where moisture content directly impacts shelf-life and structural integrity.
- Research applications in polymer science—monitoring hydrolysis kinetics or catalyst hydration states.
FAQ
What standards does the LJ-WS4 comply with?
It meets GB/T 11133, GB/T 6283, Chinese Pharmacopoeia 2020 Edition Vol. IV Section 0832, ASTM D6304, ISO 760, and EP 2.5.12.
Can the instrument connect to an external balance?
Yes—via RS-232 interface with configurable baud rate and auto-weighing trigger protocol (optional configuration required).
Is drift compensation adjustable manually?
No—drift correction is fully automated and adaptive, based on real-time background current monitoring during titration pauses.
What is the maximum sample weight capacity for solid analysis?
The system supports samples up to 10 g when used with standard 5 mL sample cups; larger masses require gravimetric dilution or coulometric mode (not supported by LJ-WS4).
Does the device support audit trail functionality out-of-the-box?
Basic audit logging (operator, date/time, result) is enabled by default; full 21 CFR Part 11 compliance requires validated third-party software integration and procedural SOPs.
