HOGON MT-V6 Automatic Constant-pH Potentiometric Titrator

Overview

The HOGON MT-V6 Automatic Constant-pH Potentiometric Titrator is an engineered solution for high-precision potentiometric titration where pH control and endpoint detection are critical. Built on classical potentiometric measurement principles—monitoring electromotive force (EMF) changes across a pH-sensitive glass electrode versus a stable reference electrode—the MT-V6 implements closed-loop feedback control to maintain user-defined pH setpoints during titration. This capability enables true constant-pH (or pH-stat) operation, essential for kinetic studies, hydrolysis monitoring, enzyme activity assays, and controlled precipitation reactions. Unlike conventional endpoint-detection titrators, the MT-V6 supports both dynamic pH stabilization and classical equivalence-point determination via first-derivative (dpH/dV) or inflection-based algorithms. Its architecture complies with fundamental requirements of ISO 8655-3 (burette accuracy), ASTM E2087 (electrochemical titration practice), and aligns with GLP documentation expectations for traceable, repeatable electrochemical analysis.

Key Features

• Real-time pH-stat mode: Active feedback loop maintains preset pH within ±0.01 pH unit during titration using PID-controlled dosing logic.
• Dual-burette configuration support: Standard 20 mL glass burette (certified volumetric accuracy per ISO 8655-3, resolution 1 µL); optional 10 mL high-resolution burette (0.5 µL resolution) for low-volume, high-sensitivity applications.
• High-fidelity potentiometric measurement: 24-bit ADC circuitry ensures stable mV acquisition across ±2000 mV range with 0.1 mV resolution and ≤0.1 mV linearity error.
• Modular electrode interface: Compatible with standard DIN/PHM sockets; supports combination pH electrodes, redox electrodes, ion-selective electrodes (ISE), and temperature-compensated probes.
• Integrated peristaltic sample handling: Programmable autosampler compatibility (via RS-232/USB) for unattended multi-sample sequences up to 96 positions.
• Rugged chemical-resistant construction: PTFE-coated fluid paths, borosilicate glass burettes, and IP54-rated enclosure for laboratory durability.

Sample Compatibility & Compliance

The MT-V6 accommodates aqueous and mildly organic media (≤20% v/v methanol, ethanol, or acetonitrile), supporting samples ranging from 5 mL to 250 mL volume. It meets material compatibility requirements for ISO 17025-accredited testing laboratories conducting acid-base, chelatometric (EDTA), redox, and precipitation titrations. All measurement data—including raw mV/pH vs. volume curves, derivative plots, and manual/automatic endpoint annotations—are timestamped and stored with full audit trail metadata (operator ID, method name, calibration history). The system supports export of CSV and XML files compliant with LIMS integration standards and satisfies documentation prerequisites for FDA 21 CFR Part 11 when deployed with validated user access controls and electronic signature modules.

Software & Data Management

The embedded firmware runs HOGON TitraSoft™ v3.2—a Windows-compatible desktop application delivering method development, real-time visualization, and post-run analysis. Software features include customizable titration protocols (up to 8 sequential steps per method), automatic calibration curve generation (Nernstian slope validation), statistical reporting (RSD%, recovery %, confidence intervals), and PDF report generation with embedded chromatogram-style titration curves. Data integrity safeguards include encrypted local storage (AES-256), USB port write-protection modes, and optional network backup to NAS or cloud repositories. Audit logs record all parameter modifications, calibration events, and result exports—fully traceable for internal QA review or external regulatory inspection.

Applications

• Environmental water analysis: Quantification of total alkalinity (APHA 2320 B), total acidity (APHA 2310 B), and carbonate speciation in drinking water, wastewater, and surface runoff.
• Pharmaceutical process control: In-process monitoring of buffer titration during API crystallization, excipient pKa verification, and stability-indicating assays per USP .
• Food & beverage quality assurance: Titratable acidity (as citric, lactic, or acetic acid) in dairy, juices, and fermented products per AOAC 947.05 and ISO 750.
• Agricultural soil testing: Determination of exchangeable acidity and lime requirement via modified SMP buffer titration protocols.
• Academic research: Teaching potentiometric fundamentals in undergraduate analytical chemistry labs; supporting graduate-level work in colloidal stability, surfactant micellization, and metal-ligand binding thermodynamics.

FAQ

Does the MT-V6 support non-aqueous titrations?
Yes—when equipped with solvent-compatible electrodes and calibrated using appropriate standard buffers (e.g., in glacial acetic acid or dimethylformamide), the system performs robustly for acidimetric titrations per ISO 17471.
Can it be integrated into a LIMS environment?
Absolutely—the instrument supports ASTM E1384-compliant data export formats and offers optional OPC UA server functionality for direct LIMS handshake.
Is GLP-compliant calibration tracking included?
Yes—calibration records (date, buffer IDs, slope/mV offset, operator) are automatically appended to each analysis file and retained for ≥36 months unless manually purged.
What maintenance intervals are recommended?
Burette piston lubrication every 6 months; electrode storage solution replacement weekly; annual verification of volumetric accuracy against certified weights per ISO 8655-6.
Does it meet CE or UL safety certification?
The MT-V6 carries CE marking (2014/30/EU EMC Directive and 2014/35/EU Low Voltage Directive) and conforms to IEC 61010-1:2010 for laboratory electrical safety.