Metrohm 901 Intelligent Karl Fischer Moisture Titrator

Overview

The Metrohm 901 Intelligent Karl Fischer Moisture Titrator is a fully automated volumetric titration system engineered for high-precision water content determination in diverse sample matrices—from pharmaceuticals and polymers to petrochemicals and food ingredients. Based on the electrochemical principle of coulometric or volumetric Karl Fischer titration (configurable per application), the instrument quantifies water via stoichiometric reaction with iodine generated in situ (coulometric mode) or delivered from standardized KF reagent (volumetric mode). As a volumetric system, the 901 precisely dispenses titrant using motorized burettes with integrated data chips that store reagent batch information—including concentration, expiration date, and calibration history—enabling traceable, audit-ready operation. Its modular architecture supports seamless integration into regulated laboratory environments requiring full compliance with Good Manufacturing Practice (GMP), Good Laboratory Practice (GLP), and U.S. FDA 21 CFR Part 11 electronic record and signature requirements.

Key Features

• Intelligent reagent management: Integrated data chips in dosing units automatically register titrant identity, concentration, lot number, and validity—eliminating manual entry errors and supporting full traceability.
• Dual-control flexibility: Operate via intuitive 7-inch color touchscreen interface or remotely via PC using tiamo™ software—both support method development, real-time titration curve visualization, and user-level access control.
• FDA 21 CFR Part 11–ready architecture: Built-in electronic signature workflows, audit trail logging (with immutable timestamps and operator IDs), and role-based permissions ensure compliance during regulatory inspections.
• Modular expansion capability: Connects natively to Metrohm’s Titrando platform and supports multiple sample handling peripherals—including the USB Sample Processor for discrete vial analysis, the 860 Oven Sampler for thermally released moisture, and the 874 Oven Autosampler for unattended batch processing of up to 72 samples.
• Robust communication infrastructure: Equipped with USB 2.0, RS-232, and Remote I/O ports; optional LabLink module enables secure Ethernet-based data transfer across local networks or controlled internet connections for centralized lab data management.

Sample Compatibility & Compliance

The 901 accommodates solid, liquid, paste, and gas-phase samples through direct injection, oven coupling, or headspace sampling—making it suitable for hygroscopic powders (e.g., APIs), viscous oils (e.g., transformer fluids), and low-water-content materials (e.g., lithium battery electrolytes). All measurement protocols adhere to internationally recognized standards including ASTM E203, ISO 760, USP , and Ph. Eur. 2.5.12. The system’s validation documentation package—including IQ/OQ/PQ templates, calibration certificates, and traceable reference standards—supports qualification under GxP frameworks. Electronic records maintain integrity through encrypted storage, automatic backup, and tamper-evident audit trails meeting ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available).

Software & Data Management

Controlled exclusively by Metrohm’s tiamo™ software (v3.3 or later), the 901 delivers comprehensive method lifecycle management—from template-driven method creation and parameter optimization to report generation and raw data archiving. tiamo™ supports customizable calculation formulas (e.g., % H₂O, ppm, mg H₂O/g sample), multi-step titration sequences, and dynamic endpoint detection algorithms. All results are stored in a relational database with configurable retention policies. Export options include PDF analytical reports, CSV datasets for LIMS integration, and XML files compliant with ASTM E1384 and ISO/IEC 17025 metadata requirements. Audit trails capture every user action—including method edits, result overrides, and instrument configuration changes—with SHA-256 hashing for data integrity verification.

Applications

• Pharmaceutical quality control: Quantification of residual moisture in lyophilized products, excipients, and active pharmaceutical ingredients per ICH Q5C guidelines.
• Polymer manufacturing: Monitoring water content in polyamide, polyethylene terephthalate (PET), and polycarbonate resins prior to extrusion or molding to prevent hydrolytic degradation.
• Electronics materials: Verification of moisture levels in solder pastes, conformal coatings, and semiconductor packaging compounds where ppm-level water induces delamination or corrosion.
• Fuel and lubricant testing: Determination of trace water in aviation turbine fuels (ASTM D6304), biodiesel (EN 14971), and hydraulic oils to assess oxidation stability and filterability.
• Food and feed analysis: Validation of moisture specifications in dried dairy powders, cereal grains, and animal feedstuffs per AOAC Official Method 952.03.

FAQ

Is the Metrohm 901 compatible with non-Metrohm KF reagents?
Yes—provided the reagent is formulated for volumetric Karl Fischer titration and its concentration is accurately entered into the system; however, Metrohm-certified reagents guarantee optimal performance and full traceability via embedded data chips.
Can the 901 perform both coulometric and volumetric titration?
No—the 901 is a dedicated volumetric titrator. For coulometric applications, Metrohm recommends the 852 Compact KF Titrino or 915 Ti-Touch.
What validation documentation is included with the instrument?
Each unit ships with factory calibration certificates, IQ/OQ protocol templates, and a traceable platinum resistance thermometer (Pt100) verification report; PQ support is available through Metrohm Application Laboratories.
Does tiamo™ support LIMS integration?
Yes—via ODBC-compliant database export, HL7 messaging, or custom API extensions developed under Metrohm’s Certified Integration Partner program.
How is data security ensured during remote access via LabLink?
LabLink employs TLS 1.2 encryption, certificate-based authentication, and configurable firewall rules; all remote sessions are logged within the same audit trail as local operations.