Spectra Invent HX-TM1720 Coulometric Karl Fischer Moisture Analyzer

Overview

The Spectra Invent HX-TM1720 is a high-precision coulometric Karl Fischer moisture analyzer engineered for trace water quantification in liquid, gaseous, and solid samples. It operates on the fundamental electrochemical principle of coulometric titration—where iodine is generated *in situ* via controlled electrolysis of iodide ions in the Karl Fischer reagent, and the total charge required to reach the endpoint is directly proportional to the water content (Faraday’s law). This method delivers superior sensitivity and accuracy for samples containing ≤100 mg of H₂O, eliminating the need for standardized titrant solutions and minimizing reagent consumption. Designed for laboratories requiring regulatory-compliant, low-maintenance moisture analysis, the HX-TM1720 meets the metrological rigor demanded by quality control, R&D, and release testing workflows across regulated industries.

Key Features

• True coulometric detection with 0.01 µg resolution and measurement range from 3 µg to 100 mg H₂O—optimized for ultra-trace and low-moisture matrices.
• Integrated drift compensation circuitry actively corrects baseline drift during titration, enhancing repeatability and reducing operator-dependent variability.
• 24 V / 10 Ah lithium battery pack enabling >10 hours of continuous field or mobile lab operation—ideal for on-site analysis in refineries, power plants, or warehouse QC labs.
• Sealed, threaded electrolytic cell interface with mechanical lock design ensures leak-tight integrity during transport and repeated cell installation cycles.
• Full-color capacitive touchscreen display with intuitive Chinese-language UI—supports real-time titration curve visualization, endpoint confirmation (audible beep + LED indicator), and on-device clock (RTC with battery backup).
• Embedded self-diagnostic system monitors electrode continuity: automatic open-circuit and short-circuit detection with visual/audible alerts prior to analysis initiation.
• Energy-efficient architecture consuming only 10 W nominal power—compliant with ISO 50001-aligned lab sustainability initiatives.

Sample Compatibility & Compliance

The HX-TM1720 accommodates diverse sample types—including hydrocarbons (e.g., transformer oil, jet fuel), solvents (acetonitrile, methanol), pharmaceutical excipients (lactose, microcrystalline cellulose), polymers, and gases (via carrier gas sparging)—without modification. Its coulometric mode eliminates volumetric reagent calibration drift, ensuring consistent performance across batch-to-batch analysis. The instrument conforms to multiple national standards governing moisture determination: GB/T 11133 (petroleum products), GB/T 11146 (natural gas), GB/T 7600 (electrical insulating oils), GB/T 6283 (chemicals), and GB/T 6023 (industrial butadiene). While not pre-certified to ISO 12937 or ASTM D6304, its operational methodology aligns with the core principles of these international protocols. Data integrity safeguards—including timestamped audit trails, non-editable result logs (10,000 entries stored locally), and tamper-resistant memory—support GLP/GMP documentation requirements.

Software & Data Management

Data export and remote monitoring are enabled via built-in Wi-Fi (IEEE 802.11 b/g/n) connectivity, allowing seamless integration into LIMS or ELN platforms without USB dependency. All measurements are automatically stamped with date, time (YYYY-MM-DD HH:MM:SS), and unique session ID. A built-in 16-character dot-matrix thermal printer (44 mm paper width) provides immediate hard-copy output compliant with 21 CFR Part 11 “printed record” provisions. No proprietary software license is required; raw data files (CSV format) are accessible via standard FTP or web-based file transfer. Audit trail metadata—including user ID (if configured), start/end time, cell status, and endpoint current profile—is retained with each record and cannot be altered post-acquisition.

Applications

• Petrochemical QA/QC: Quantifying water in crude fractions, lubricants, and aviation fuels per GB/T 11133 to prevent corrosion and phase separation.
• Pharmaceutical manufacturing: Verifying residual moisture in lyophilized APIs and sterile fill-finish intermediates—critical for stability and sterility assurance.
• Power industry maintenance: Monitoring moisture ingress in transformer oil (GB/T 7600) to assess insulation degradation and schedule preventive servicing.
• Research laboratories: Kinetic studies of hygroscopicity in novel battery electrolytes or MOFs using repeatable sub-10 µg detection capability.
• Environmental testing: Measuring bound water in soil extracts or atmospheric particulate filters where gravimetric methods lack sensitivity.

FAQ

What is the minimum detectable water mass using the HX-TM1720?
The instrument achieves a resolution of 0.01 µg and a lower detection limit of 3 µg H₂O under optimal conditions (low-drift environment, fresh reagent, calibrated electrodes).
Does the analyzer support compliance with FDA 21 CFR Part 11?
It provides foundational elements—electronic signatures (via optional user login), audit trails, and immutable records—but requires site-specific validation and procedural controls to achieve full Part 11 compliance.
Can the HX-TM1720 analyze solid samples directly?
Yes—solids must be dissolved or suspended in a suitable KF-compatible solvent (e.g., chloroform/methanol mixtures) prior to injection; the system does not include integrated sample heating or vaporization modules.
Is the electrolytic cell included with the base unit?
Yes—the standard configuration includes a dual-compartment coulometric cell with platinum working electrode, generator electrode, and desiccant-filled drying tube.
What maintenance intervals are recommended for routine operation?
Daily: Electrode cleaning with dry acetone; weekly: Reagent replacement and cell rinsing; quarterly: Verification of coulombic efficiency using certified 1.00 mg H₂O standard.