Metrohm 852 Titrando Coulometric/ Volumetric Karl Fischer Moisture Analyzer

Overview

The Metrohm 852 Titrando is a dual-mode Karl Fischer (KF) moisture analyzer engineered for precision, reproducibility, and laboratory scalability. It uniquely supports both coulometric and volumetric KF titration within a single platform—enabling quantitative water determination across an exceptionally broad dynamic range: from trace-level analysis (1 µg H₂O) to 100% water content (w/w). Its core architecture integrates Metrohm’s patented zero-dead-volume burette design (for volumetric mode) and optimized coulometric cell geometry, minimizing carryover, drift, and reagent consumption. The instrument operates on the fundamental electrochemical principle of iodine generation (coulometric) or iodine dosing (volumetric), where water stoichiometrically reacts with iodine, sulfur dioxide, and base in methanol-based KF reagents. Designed for regulated environments, the 852 Titrando meets method validation requirements under ISO/IEC 17025 and supports full traceability per FDA 21 CFR Part 11 when used with tiamo™ software configured for electronic signatures and audit trails.

Key Features

• Touch-initiated or fully automated titration start: No manual “Start” button required—sample introduction triggers immediate pre-titration balancing and endpoint detection, eliminating operator-induced errors and false background integration.
• Intelligent reagent management: Integrated MSB interface enables seamless connection to Metrohm Dosino or Multi-Dosing Units for fully automated reagent replacement, solvent addition, standard solution dosing, or auxiliary solvent delivery—without opening the titration vessel. Reagent exchange is triggered by configurable parameters including cumulative titrant volume, elapsed time, measured drift, or calculated water capacity exhaustion.
• Dual control architecture: Operable via built-in high-resolution touchscreen (optional) or remotely via tiamo™ software on Windows-based workstations—supporting method development, multi-user access control, and centralized instrument fleet management.
• Bromine index extension: Utilizes the same KF electrodes and cell configuration; only the electrolyte medium is modified (e.g., to acetic anhydride–chloroform mixture). No hardware modification or additional accessories are required—enabling rapid method switching between moisture and bromine index analysis.
• Modular automation readiness: Native compatibility with Metrohm 814/815 USB Sample Processors (up to 100 positions), 874 Oven Sampler (for thermally released water), and 864 Robotic Sample Processor—enabling unattended, 24/7 operation with full sample identification and result correlation.

Sample Compatibility & Compliance

The 852 Titrando accommodates diverse sample matrices—including solids (polymers, pharmaceuticals, salts), liquids (solvents, oils, acids), gases (via gas diffusion cells), and viscous materials (greases, resins)—through configurable sample introduction methods (direct injection, oven coupling, or headspace sampling). All KF methods implemented on this platform comply with internationally recognized standards: ASTM D6304 (petroleum products), ISO 760 (general KF principles), ISO 12937 (crude oil), USP (pharmaceutical water content), and Ph. Eur. 2.5.12. When deployed with tiamo™ in validated configurations, the system satisfies GLP and GMP documentation requirements—including electronic signature enforcement, user role-based permissions, and immutable audit trails covering method changes, calibration events, and raw data modifications.

Software & Data Management

tiamo™ software serves as the central analytical hub, supporting method creation, sequence programming, real-time titration curve visualization, and automated report generation (PDF/CSV/XLSX). It provides full compliance with 21 CFR Part 11 through integrated electronic signatures, biometric or token-based authentication, and tamper-evident audit logs that record timestamped actions for every user interaction. Data integrity is reinforced via automatic backup, version-controlled method storage, and secure database encryption. Batch processing, statistical evaluation (mean, RSD, confidence intervals), and trend analysis across multiple instruments are natively supported—facilitating quality control laboratories in pharmaceutical, chemical, and food industries.

Applications

Typical use cases include moisture quantification in active pharmaceutical ingredients (APIs) and excipients per ICH Q5C guidelines; residual solvent analysis in polymer synthesis; water content verification in lithium-ion battery electrolytes; specification testing of aviation fuels (ASTM D6304); and bromine index determination in olefinic hydrocarbons per ASTM D1159. The system is routinely deployed in QC labs of multinational chemical manufacturers, contract research organizations (CROs), and regulatory agencies requiring auditable, repeatable, and transferable KF methodologies.

FAQ

Can the 852 Titrando perform both coulometric and volumetric titrations in a single sequence?
Yes—tiamo™ allows parallel method definition and execution: one sample can be analyzed coulometrically while another undergoes volumetric titration, with independent parameter sets and reporting templates.
Is oven coupling mandatory for solid samples?
No—direct sample dissolution in KF reagent is supported for soluble solids; the 874 Oven Sampler is recommended only for thermally stable, non-soluble, or moisture-occluded materials (e.g., ceramics, metal oxides).
How does the system ensure reagent stability during automated replacement?
All MSB-connected dosing units maintain sealed fluid paths; reagent bottles are nitrogen-purged and equipped with hydrophobic membrane vents to prevent ambient moisture ingress during exchange.
Does tiamo™ support LIMS integration?
Yes—via ASTM E1384-compliant ASCII export, OPC UA server interface, or custom API integration for bidirectional data exchange with major LIMS platforms.
What maintenance routines are recommended for long-term reliability?
Daily: Electrode cleaning with ethanol and inspection of septum integrity. Weekly: Burette piston lubrication and cell rinsing with dry methanol. Quarterly: Full system performance verification using certified water standards (e.g., Hydranal® CertiPUR®).