Metrohm 870 KF Titrino Plus Volumetric Karl Fischer Moisture Analyzer

Overview

The Metrohm 870 KF Titrino Plus is a fully automated volumetric Karl Fischer titrator engineered for routine moisture analysis in quality control, production laboratories, and regulated industrial environments. It operates on the stoichiometric principle of iodine–sulfur dioxide redox reaction in anhydrous methanol or ethanol-based solvent systems, where water quantitatively consumes iodine in the presence of base and sulfur dioxide. The instrument delivers high reproducibility across diverse sample matrices—including hygroscopic solids, viscous oils, volatile solvents, and gaseous streams—by integrating precise reagent delivery, real-time electrochemical endpoint detection (bipotentiometric, iPol/uPol), and thermally stabilized titration cell management. Designed as a mid-tier platform within Metrohm’s KF portfolio, the 870 KF Titrino Plus bridges operational simplicity with metrological rigor, offering traceable compliance without requiring expert-level method development.

Key Features

• Smart Exchange Unit with embedded EEPROM chip: Automatically transmits critical reagent metadata—including nominal titer, expiration date, solvent type, and burette volume—to the titrator upon installation, eliminating manual entry errors and ensuring data integrity from first use.
• Volumetric dosing resolution of 1/10,000 (0.0001 mL): Achieved via high-precision stepper motor-driven piston burette, enabling accurate quantification even at sub-ppm moisture levels in low-mass samples.
• Real-time bipotentiometric curve display on integrated LCD: Visualizes polarization voltage vs. titrant volume, allowing immediate identification of side reactions (e.g., aldehyde interference, oxidation of sulfites) and empirical optimization of endpoint criteria.
• 803 KF Dedicated Titration Stand with integrated membrane pump: Enables fully closed-loop solvent exchange—waste removal and fresh solvent addition—without opening the titration vessel, minimizing atmospheric moisture ingress and operator exposure to organic vapors.
• Comprehensive safety architecture: Includes programmable pre-titration conditioning parameters to prevent overfilling, anti-siphon valve in waste bottle assembly, and hardware-enforced reagent transfer interlocks compliant with IEC 61010-1.
• Dual-input operation: Native support for both USB keyboard and optical mouse—unique among KF titrators—reducing training time and accommodating ergonomic preferences in high-throughput lab environments.

Sample Compatibility & Compliance

The 870 KF Titrino Plus accommodates solid powders (e.g., pharmaceutical excipients, polymers), liquids (e.g., solvents, fuels, lubricants), and gases (via gas sampling valve or coulometric adapter kit). Its sealed titration cell design and ethanol-compatible reagent options meet occupational health requirements under OSHA 1910.1200 and EU CLP Regulation. From a regulatory standpoint, the system supports full GLP documentation workflows—including electronic audit trails, user access levels (admin/operator/visitor), timestamped method versioning, and raw data export in CSV/PDF formats. It satisfies analytical validation requirements per ICH Q2(R2), complies with pharmacopoeial standards (USP , Ph. Eur. 2.5.12, JP 2.05), and provides the foundational architecture for 21 CFR Part 11 compliance when deployed with validated network storage and digital signature modules.

Software & Data Management

The instrument runs on embedded firmware with English-only UI optimized for intuitive navigation. Predefined methods cover titer determination, blank correction, and sample moisture quantification—all executable via single-button initiation. Users may customize calculation formulas using standard arithmetic operators and built-in unit conversion (mg, g, µL, mL, %, ppm, ppb). All measurement data—including raw mV/time traces, calculated results, reagent lot IDs, environmental temperature/humidity logs (when interfaced with external sensors), and operator credentials—are stored locally on internal flash memory and exportable via USB mass storage. Data files adhere to Metrohm’s proprietary .TIT format (human-readable ASCII structure) and include cryptographic checksums for integrity verification during archival or regulatory submission.

Applications

This analyzer is routinely deployed in pharmaceutical manufacturing for residual moisture testing of lyophilized APIs (per FDA guidance on lyophilization process validation), in petrochemical QA labs for water-in-fuel specification checks (ASTM D6304), in battery material R&D for electrolyte purity screening, and in food ingredient suppliers for compliance with Codex Alimentarius moisture limits. Its robustness and repeatability make it suitable for ISO/IEC 17025-accredited testing laboratories performing contract moisture analysis under accredited scope.

FAQ

Does the 870 KF Titrino Plus support coulometric KF titration?
No—it is exclusively configured for volumetric Karl Fischer titration. Coulometric applications require the Metrohm 852 Titrando or 917 KF Ti-Touch platforms.
Can I connect an external balance with automatic weight import?
Yes—via USB or RS-232 interface; the instrument accepts Sartorius, Mettler Toledo, and Shimadzu balances compliant with METTLER TOLEDO Standard or ASTM E2273 protocols.
Is method validation documentation provided?
Metrohm supplies a comprehensive Instrument Qualification Package (IQ/OQ) and a Method Validation Guide aligned with ICH Q2(R2), including linearity, accuracy, precision, LOD/LOQ, and robustness test templates.
What maintenance intervals are recommended?
Daily: Electrode cleaning and drying; weekly: Solvent replacement and tip rinse; quarterly: Burette calibration verification using certified syringe standards; annually: Full preventive maintenance by Metrohm-certified service engineer.
Can the system be integrated into a LIMS environment?
Yes—through ASCII-based serial output or third-party middleware supporting HL7 or ASTM E1384; raw data export enables direct ingestion into LabVantage, Thermo Fisher SampleManager, or Waters Empower.