METTLER TOLEDO EasyPlus iTitrate™ Automatic Potentiometric Titrator

Overview

The METTLER TOLEDO EasyPlus iTitrate™ Automatic Potentiometric Titrator is a compact, CE- and ISO/IEC 17025-aligned benchtop titration system engineered for precision, repeatability, and operational simplicity in routine quality control and academic 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 delivered—enabling accurate determination of stoichiometric equivalence points across acid-base, redox, precipitation, and Karl Fischer titrations. Designed and validated by METTLER TOLEDO’s Swiss R&D center, the platform integrates hardware robustness with software intelligence to meet GLP-compliant workflows without requiring advanced electrochemical expertise. Its modular architecture supports interchangeable electrodes, burettes, and sample handling accessories, ensuring adaptability across diverse sample matrices—from aqueous solutions to viscous food extracts and organic solvents.

Key Features

• iTitrate™ Smart Interface: A touch-enabled, icon-driven UI modeled after modern mobile operating systems—supporting 15 languages including English, German, French, Japanese, and simplified Chinese—with LongClick™ functionality for rapid recall of recently executed methods.
• EasySetup Wizard: Guides users through method configuration with minimal input—automatically populating calculation parameters (e.g., titrant normality, sample mass, unit conversion factors) based on selected application templates.
• High-Stability Electrochemical Measurement Circuitry: Delivers <0.2% full-scale accuracy in pH/mV mode with 0.01 pH and 0.1 mV resolution, compliant with ASTM E70 and ISO 3696 Grade 3 water specifications for electrode calibration validation.
• Integrated Temperature Compensation: Built-in Pt1000 sensor enables real-time temperature monitoring (0–100 °C, ±0.1 °C resolution) for thermally corrected titration curves and Nernst equation-based calculations.
• Robust Burette Drive System: Precision stepper motor control ensures consistent dispensing volume accuracy within ±0.3 mV ±1 digit over 3-hour continuous operation—validated per ISO 8655-3 for piston burette performance.

Sample Compatibility & Compliance

The EasyPlus series accommodates liquid, semi-solid, and homogenized samples across food & beverage (e.g., fruit juice acidity, wine SO₂, dairy titratable acidity), environmental (chloride in wastewater, alkalinity in surface water), pharmaceutical (USP acid value testing), and chemical manufacturing (peroxide value in oils, NaCl content in brines). All standard configurations include certified reference electrodes (Ag/AgCl, double-junction pH), redox electrodes (Pt), and Karl Fischer reagent-compatible cells. The instrument complies with ISO 7870-2 (control charts for titration process monitoring), supports audit trails meeting FDA 21 CFR Part 11 requirements when paired with LabX Lite software, and facilitates IQ/OQ documentation packages for GMP-regulated environments.

Software & Data Management

Data acquisition, calculation, and reporting are managed via the embedded iTitrate™ firmware with optional LabX Lite connectivity for centralized method deployment, electronic signature capture, and secure cloud backup. Raw titration curves (E vs. V), first/second derivative plots, and equivalence point tables are exportable in CSV and PDF formats. All measurement events—including electrode calibration logs, titrant standardization records, and user login timestamps—are time-stamped and immutable within the internal memory, satisfying traceability requirements under ISO/IEC 17025:2017 clause 7.7. Method files support password protection and version control, while firmware updates are delivered via USB or Ethernet with SHA-256 integrity verification.

Applications

• Acid-Base Titrations: Total acidity (TA) in beverages (AOAC 942.15), titratable acidity in milk (IDF Standard 14C), phenolphthalein- and methyl orange-endpoint alkalinity (APHA 2320 B/C).
• Redox Titrations: Ascorbic acid (vitamin C) in fortified foods (AOAC 967.21), peroxide value in edible oils (AOCS Cd 8b-90), sulfur dioxide in wine (OIV-MA-AS313-01A).
• Precipitation Titrations: Chloride quantification in drinking water (ISO 9297), salt content in processed meats (AOAC 937.02), silver ion concentration in plating baths.
• Karl Fischer Coulometric/Volumetric Modes: Water content in hygroscopic APIs (USP ), solvents (ICH Q5C), and polymers (ASTM D6304).

FAQ

Is the EasyPlus series compliant with 21 CFR Part 11 for electronic records?
Yes—when operated with LabX Lite software and configured with user authentication, audit trail logging, and electronic signatures, it meets predicate rule requirements for regulated QC labs.
Can I use third-party electrodes or burettes?
METTLER TOLEDO recommends original electrodes and burettes to ensure metrological traceability and maintain warranty coverage; non-OEM components may affect measurement reproducibility and invalidate ISO/IEC 17025 compliance claims.
What calibration standards are required for daily verification?
pH calibration requires NIST-traceable buffers at pH 4.01, 7.00, and 10.01; mV verification uses quinhydrone or Zn/ZnSO₄ reference solutions; temperature validation employs certified RTD calibrators per ISO/IEC 17025 clause 6.5.
Does the system support automated sample changers?
The ET38 and ET58 models feature RS-232 and USB device ports compatible with METTLER TOLEDO’s Rondolino 810 automatic sampler for unattended batch analysis.
How often should the burette piston seal be replaced?
Under typical usage (≤50 titrations/day), the PTFE-coated piston seal is rated for ≥10,000 dispense cycles; replacement is advised upon observed drift exceeding ±0.5% relative standard deviation in replicate standardizations.