Metler-Toledo G20 Automatic Potentiometric Titrator

Overview

The Mettler-Toledo G20 Automatic Potentiometric Titrator is an entry-level, benchtop titration system engineered for precision, repeatability, and operational simplicity in routine quality control and regulatory-compliant laboratories. It operates on the fundamental principle of potentiometric endpoint detection—measuring the potential difference between a reference electrode and an indicator electrode as titrant is incrementally added—enabling accurate determination of equivalence points in acid-base, redox, precipitation, complexometric, and photometric titrations. Designed specifically for high-throughput environments in food & beverage, water treatment, and fine chemical manufacturing, the G20 integrates robust hardware architecture with intuitive software logic to minimize operator dependency while maintaining full traceability and data integrity.

Key Features

• One Click® graphical user interface with context-sensitive soft keys—reduces training time and minimizes procedural errors through guided workflows.
• Integrated propeller-type stirrer with adjustable speed and torque compensation ensures homogeneous mixing across viscosity ranges without manual intervention.
• Auto-recognizing burette module (1 internal standard burette; optional second external dosing unit) supports rapid method switching and dual-titrant protocols.
• Plug-and-play electrode connectivity compliant with ISM® (Intelligent Sensor Management) standards—automatically loads calibration history, serial number, and sensor-specific parameters upon connection.
• GLP-conform printout functionality generates fully traceable reports including date/time stamps, operator ID, method name, sample ID, raw mV/pH curves, endpoint coordinates, and statistical summaries—all compliant with ISO/IEC 17025 documentation requirements.
• Multi-language support (9 languages) enables seamless deployment across multinational facilities without localization overhead.
• Up to four customizable one-touch titration shortcuts per user profile accelerate repetitive assays—ideal for daily acid value, peroxide value, or chloride content checks in food QC labs.

Sample Compatibility & Compliance

The G20 accommodates standard 50–250 mL titration vessels and interfaces directly with the Rondolino automated sample changer (up to 120 positions), supporting unattended batch analysis under ambient or controlled temperature conditions. Its electrochemical architecture meets critical industry specifications: ASTM E2087 (standard practice for potentiometric titration), ISO 8655-6 (volumetric equipment—burette performance), and USP (titrimetry). When operated with LabX® Light software (purchased separately), the system provides full 21 CFR Part 11 compliance—including electronic signatures, role-based access control, and immutable audit trails—making it suitable for regulated environments governed by FDA, EMA, or PMDA requirements.

Software & Data Management

While the G20 operates autonomously via its embedded firmware, optional integration with LabX® Light software unlocks advanced data governance capabilities. LabX® Light enables centralized method storage, remote instrument monitoring, automated report generation in PDF/CSV formats, and secure database archiving with version-controlled method updates. All raw titration curves (E vs. V), derivative plots (dE/dV), and metadata are stored with cryptographic hashing to prevent tampering. The system supports direct export to LIMS platforms via ODBC or REST API, ensuring alignment with laboratory digitalization strategies and ISO/IEC 17025 Clause 7.5 on data management.

Applications

The G20 delivers validated performance across multiple regulated workflows: total acidity (TA) and volatile acidity (VA) in wine and juice matrices; free fatty acid (FFA) quantification in edible oils per AOAC 943.01; chloride determination in drinking water (ISO 9297); peroxide value in fats per AOAC 965.33; and total alkalinity in wastewater effluents (APHA 2320 B). Its built-in library of >20 pre-validated Metrohm and Mettler-Toledo methods—covering dairy, brewing, sugar refining, and pharmaceutical excipient testing—eliminates method development overhead and accelerates method transfer between sites.

FAQ

Does the G20 support equivalence point detection via first-derivative or Gran plot analysis?
Yes—the instrument calculates equivalence points using both first-derivative maxima and Gran plot linear regression algorithms, configurable per method.
Can the G20 perform thermometric or photometric titrations?
No—this model is strictly potentiometric; photometric and thermometric modules require higher-tier platforms such as the T50 or T90 series.
Is the Rondolino autosampler included by default?
No—the Rondolino is an optional accessory; the base G20 configuration supports manual sample loading only.
What electrode types are natively supported?
All ISM-enabled pH, redox, ion-selective (e.g., Ag, Cl⁻, F⁻), and combination electrodes with DIN/mini-DIN connectors.
Does the G20 meet GLP requirements out-of-the-box?
Yes—its embedded reporting engine satisfies core GLP documentation needs; full GMP compliance requires LabX® Light with 21 CFR Part 11 activation.