Metrohm 915 KF Ti-Touch Compact Coulometric-Free Karl Fischer Titrator

Overview

The Metrohm 915 KF Ti-Touch is a fully integrated, benchtop volumetric Karl Fischer titrator engineered for routine and high-throughput moisture determination in regulated and research laboratories. It operates on the classical volumetric Karl Fischer principle—where iodine generated electrochemically or delivered via standardized reagent reacts stoichiometrically with water—and delivers trace-level quantification across a dynamic range of 10 ppm to 100% water content. Unlike modular systems requiring external controllers or PCs, the 915 KF Ti-Touch embeds all critical hardware—including the Dosino precision dosing unit, dual-mode polarographic electrode interface (Ipol/Upol), Peltier-cooled magnetic stirrer, sealed titration cell, and 4.3″ full-color capacitive touchscreen—within a single compact chassis (270 × 320 × 350 mm). Its architecture eliminates inter-unit cabling, reduces footprint by >40% versus conventional setups, and supports true walk-up operation without prerequisite software installation or host computer dependency.

Key Features

• Patented Dosino dosing technology with intelligent data-chip recognition—enables plug-and-play replacement of reagent cartridges without manual calibration or exposure to hazardous KF reagents
• Dual electrochemical detection modes: Ipol (constant-current polarization) for low-conductivity matrices and Upol (constant-voltage polarization) for high-ionic-strength samples—ensuring robust endpoint detection across solvents including chloroform, methanol, pyridine-free formulations, and viscous oils
• Integrated membrane pump system—allows one-touch solvent refill and waste aspiration without opening the titration vessel, minimizing atmospheric moisture ingress and operator contact
• Two MSB (Metrohm Serial Bus) interfaces—support expansion to dual-channel titration via two independent Dosino units or hybrid configurations with 805 Dosimat burettes and auxiliary stirrers (801/802/803)
• “Safe Stop Volume” parameter—configurable pre-titration volume limit that halts reagent addition if electrode malfunction or excessive sample moisture causes uncontrolled drift, preventing overflow and cross-contamination
• 14 user-customizable method shortcuts on the touchscreen—each storing full method parameters (titrant concentration, drift correction, endpoint threshold, stirring speed, temperature compensation), enabling rapid method recall without navigation menus
• Built-in Ethernet port and dual USB-A ports—permit direct connection to LIMS, network printers, barcode scanners, analytical balances, and USB storage devices; no PC required for report generation or data archiving

Sample Compatibility & Compliance

The 915 KF Ti-Touch accommodates solid, liquid, paste, and gaseous samples—either manually introduced or via automated sample processors (814/815). Its sealed cell design and inert gas purge compatibility (optional) ensure stability during analysis of hygroscopic powders (e.g., APIs, excipients), hydrophobic polymers, lubricants, and battery electrolytes. All measurement data—including raw titration curves, endpoint timestamps, drift values, and environmental temperature (via Pt1000/NTC probe)—are timestamped and stored with cryptographic hash integrity. PDF reports comply with FDA 21 CFR Part 11 requirements when used with tiBase software and configured with electronic signatures, audit trails, and role-based access control. The system meets ISO/IEC 17025 documentation standards and supports validation protocols aligned with ASTM E203 (water in organic liquids), USP (moisture content), and Ph. Eur. 2.5.12 (Karl Fischer titration).

Software & Data Management

Data acquisition, processing, and reporting are managed natively via the embedded operating system—no external PC license or runtime dependency is required. Raw data and metadata (operator ID, sample ID, method version, instrument serial, environmental conditions) are written to internal flash memory and simultaneously mirrored to USB drives in encrypted UDF format. Each PDF report includes a digital signature block, SHA-256 checksum, and QR code linking to the original binary dataset—enabling forensic verification of result authenticity. Exported .csv or .txt files are structured for direct import into tiBase, Metrohm’s validated data management suite, which provides trend analysis, statistical process control (SPC), multi-instrument aggregation, and electronic batch record (EBR) generation. Network deployment allows centralized method distribution, remote firmware updates, and real-time status monitoring via SNMP or HTTP API.

Applications

The 915 KF Ti-Touch is routinely deployed in quality control laboratories for pharmacopeial compliance testing of active pharmaceutical ingredients (APIs), lyophilized biologics, and sterile packaging materials per USP . In petrochemical QA, it quantifies water in jet fuel (ASTM D6304), transformer oil (IEC 60814), and biodiesel blends. Materials science labs use it to verify moisture thresholds in lithium-ion battery cathode precursors (<20 ppm), optical-grade resins, and semiconductor-grade solvents. Food & beverage applications include moisture profiling of powdered dairy, instant coffee, and dehydrated vegetables—where reproducibility across matrix types is ensured by adaptive drift compensation and solvent blank subtraction algorithms embedded in the firmware.

FAQ

Does the 915 KF Ti-Touch support both coulometric and volumetric Karl Fischer methods?
No—it is a dedicated volumetric KF titrator. Coulometric measurements require separate instrumentation (e.g., Metrohm 852 Titrando with generator electrodes).
Can the instrument be validated for GMP environments?
Yes—when paired with tiBase and configured with electronic signatures, audit trails, and user access levels, it satisfies ALCOA+ data integrity principles and supports IQ/OQ/PQ documentation.
What is the maximum number of samples per hour in automated mode?
With an 815 sample processor and optimized method settings (e.g., 1 mL injection, 15 s equilibration), throughput reaches 25–30 determinations/hour.
Is temperature compensation mandatory for accurate results?
While not mandatory, integration of a Pt1000 probe enables automatic viscosity- and density-corrected titrant delivery, improving accuracy for samples measured at non-ambient temperatures.
How does the “Ipol/Upol” mode selection affect measurement robustness?
Ipol mode enhances sensitivity for low-water-content samples in low-conductivity solvents (e.g., toluene), whereas Upol mode suppresses noise in high-salt matrices like brines or biological extracts—both modes auto-select optimal current/voltage ranges based on real-time conductivity feedback.