Metrohm 841 Titrando Karl Fischer Moisture Analyzer

Overview

The Metrohm 841 Titrando is a modular, volumetric Karl Fischer titrator engineered for high-precision determination of trace water content in solid, liquid, and gaseous samples across pharmaceutical, chemical, petrochemical, and polymer laboratories. Based on the electrochemical stoichiometric reaction between iodine and water (I₂ + SO₂ + H₂O → 2HI + SO₃), the system delivers reproducible quantification down to 10 µg H₂O with robust endpoint detection via dual platinum electrodes. Unlike single-purpose moisture analyzers, the 841 Titrando operates as a universal titration platform—capable of potentiometric, pH-metric, and redox titrations—while maintaining full compliance with pharmacopeial standards including USP , EP 2.5.12, and ASTM E203. Its architecture integrates metrological traceability, automated reagent handling, and audit-ready data integrity—making it suitable for regulated QC environments requiring documented method validation and instrument qualification.

Key Features

• Modular design with interchangeable 800 Dosino burettes (2, 5, 10, 20, or 50 mL), each equipped with an embedded EEPROM chip storing calibration history, nominal volume, resolution, and expiration date of KF reagents.
• Piston-driven dosing mechanism eliminates dead volume and ensures bubble-free reagent delivery; integrated purge-and-rinse cycles prevent cross-contamination during multi-reagent workflows.
• 803 KF titration stand featuring a sealed reaction vessel with low-drift (<10 µg/min) moisture barrier, built-in diaphragm pump for waste aspiration and fresh reagent delivery, and overflow protection for safe unattended operation.
• High-resolution 7-inch color TFT touchscreen with intuitive wizard-guided interface; supports multilingual operation (English, Chinese, German, French, Spanish) and stores >100 user-defined methods locally.
• Full USB, RS-232, and Ethernet connectivity—including Lab Link for direct firmware updates, remote method download from Metrohm’s application library, and secure LIMS data push without intermediate PC.

Sample Compatibility & Compliance

The 841 Titrando accommodates diverse sample matrices: hygroscopic powders (e.g., APIs, excipients), viscous oils (lubricants, transformer fluids), solvents (acetonitrile, methanol), and thermally labile compounds (via optional 774 sample heater with programmable temperature ramping up to 120 °C). All hardware and software components meet ISO/IEC 17025 requirements for testing laboratories. The tiamo™ software implements role-based access control, electronic signatures, full audit trail (including parameter changes, method edits, and result overrides), and immutable raw data archiving—fully satisfying FDA 21 CFR Part 11, EU Annex 11, and ICH GCP/GMP documentation mandates.

Software & Data Management

tiamo™ software serves as the central analytical engine: its graphical method editor enables drag-and-drop construction of complex titration sequences (e.g., pre-titration stabilization, solvent blank correction, multi-step sample dissolution). Reports are customizable using WYSIWYG templates compliant with internal SOPs or regulatory submission formats (PDF/A, CSV, XML). Integrated database supports SQL queries across instruments, users, dates, and batch IDs. When deployed with NuGenesis SDMS or eRecordManager, raw titration curves, metadata, and audit logs are archived in accordance with ALCOA+ principles. Remote instrument monitoring and parallel titration across up to four 841 units are supported via networked tiamo™ server deployment.

Applications

• Pharmaceutical QC: Water content verification in lyophilized products, active pharmaceutical ingredients (APIs), and packaging materials per USP .
• Electronics: Moisture analysis in solder pastes, conformal coatings, and lithium-ion battery electrolytes where residual H₂O degrades performance.
• Polymers & Plastics: Determination of moisture in PET, nylon, and polyamide resins prior to extrusion—critical for avoiding hydrolytic degradation.
• Fuel & Lubricants: Quantification of water in jet fuel (ASTM D6304), transformer oil (IEC 60814), and biodiesel blends.
• Food & Cosmetics: Validation of desiccant efficacy in packaging and moisture stability of emulsions and powdered supplements.

FAQ

Does the 841 Titrando support both coulometric and volumetric KF titration?
No—the 841 Titrando is exclusively a volumetric titrator. For coulometric applications, Metrohm recommends the 852 Titrando or 915 Ti-Touch systems.
Can tiamo™ software control third-party autosamplers?
Yes—tiamo™ supports standardized communication protocols (RS-232, USB-HID) and offers configurable I/O triggers for integration with non-Metrohm sample processors, provided they comply with tiamo™’s command syntax.
Is method validation documentation available for regulated industries?
Metrohm provides IQ/OQ/PQ protocol templates, system suitability test procedures, and 21 CFR Part 11 configuration guides—all included in the tiamo™ Validation Package licensed separately.
What is the minimum detectable water mass?
With optimized 2 mL Dosino and stabilized ambient conditions (<5 µg/min drift), the practical detection limit is 10 µg H₂O (±2 µg RSD, n=6), verified per ASTM E203 Annex A1.
How is data backup handled in standalone mode?
All methods, results, and audit trails are stored on internal flash memory and can be exported via USB stick in encrypted .tmd format; automatic daily backups to network shares are enabled when Lab Link is configured.