METTLER TOLEDO SevenGo Duo Pro pH/mV/DO/Conductivity Portable Multiparameter Meter

Overview

The METTLER TOLEDO SevenGo Duo Pro is a high-precision, dual-channel portable multiparameter meter engineered for rigorous field and at-line measurement of pH, mV (redox potential), dissolved oxygen (DO), and conductivity in industrial process control, environmental monitoring, and quality assurance laboratories. Built upon METTLER TOLEDO’s legacy of electrochemical sensor excellence, the instrument employs potentiometric (pH/mV), galvanic or polarographic (DO), and four-electrode conductivity measurement principles—ensuring traceable accuracy, minimal drift, and robust performance across variable temperature and ionic strength conditions. Its fully sealed, IP67-rated housing guarantees operational integrity in humid, dusty, or splash-prone environments—including wastewater treatment plants, food & beverage production lines, pharmaceutical cleanrooms, and field-based environmental sampling sites. Designed for regulatory compliance from inception, the SevenGo Duo Pro supports full audit trails, user authentication, and time-stamped data logging aligned with Good Laboratory Practice (GLP) and Good Manufacturing Practice (GMP) frameworks.

Key Features

• Dual independent measurement channels: Simultaneous real-time acquisition of pH/mV paired with either DO or conductivity—eliminating sequential measurement delays and cross-parameter interference.
• IP67-certified enclosure: Fully dust-tight and submersible up to 1 m for 30 minutes; validated for continuous operation in outdoor, mobile, or high-humidity industrial settings.
• GLP-compliant data management: Automatic timestamping, operator ID tagging, electrode calibration history storage (up to 10 calibrations per parameter), and configurable data retention (≥2,000 readings per channel).
• Infrared (IR) wireless data transfer: Secure, cable-free export of raw measurement data, calibration reports, and system logs to Windows-based PCs or thermal printers—no drivers required.
• Intelligent electrode diagnostics: Real-time display of slope, offset, and response time for pH electrodes; membrane integrity and electrolyte level indicators for DO sensors; cell constant verification for conductivity cells.
• Ergonomic handheld design: Textured grip, angled display for glare-free viewing, and balanced weight distribution optimized for extended one-handed operation during field surveys or process walkdowns.

Sample Compatibility & Compliance

The SevenGo Duo Pro accommodates standard DIN/ISO-compliant pH electrodes (e.g., InLab® Expert Pro), galvanic DO probes (e.g., InLab® OptiOx), and conductivity cells (e.g., InLab® Cond). It supports aqueous samples across pH 0–14, DO 0–20 mg/L (or 0–200% saturation), and conductivity 0.01 µS/cm–500 mS/cm—covering applications from ultrapure water validation to brine process streams. All firmware and calibration routines adhere to ISO 7888 (conductivity), ISO 5814 (DO), and ASTM D1293 (pH of water), while the IR communication protocol satisfies FDA 21 CFR Part 11 requirements for electronic records when used with METTLER TOLEDO LabX® Lite software. The device is CE-marked, RoHS-compliant, and certified for use in Zone 2 hazardous locations when paired with approved intrinsically safe accessories.

Software & Data Management

Data generated by the SevenGo Duo Pro is structured in ASCII-compatible .csv format, enabling direct import into LIMS, ELN, or statistical process control (SPC) platforms. The included METTLER TOLEDO EasyDirect™ Mobile app (iOS/Android) allows remote configuration, live monitoring, and QR-code-based calibration certificate retrieval via Bluetooth Smart. For regulated environments, optional integration with LabX® Lite provides full 21 CFR Part 11 compliance—including electronic signatures, role-based access control, and immutable audit trails. Calibration data includes temperature-compensated values, uncertainty estimates per ISO/IEC 17025, and automatic detection of out-of-specification electrode performance—reducing manual verification overhead.

Applications

• Pharmaceutical water systems: On-site verification of Purified Water (PW) and Water for Injection (WFI) per USP and EP 2.2.38.
• Fermentation bioprocess control: Spot-checking pH and DO gradients across bioreactor sampling ports without interrupting sterile operation.
• Food safety audits: Rapid assessment of surface rinse water pH and conductivity to validate cleaning-in-place (CIP) efficacy.
• Environmental field work: Simultaneous profiling of river pH, DO saturation, and specific conductance during EPA Method 120.1 and 120.2 deployments.
• Chemical manufacturing QA: Batch release testing of acid/base titrant solutions using mV endpoint detection and conductivity verification.

FAQ

Does the SevenGo Duo Pro support automatic temperature compensation (ATC) for all parameters?
Yes—integrated Pt1000 or NTC temperature sensors enable simultaneous ATC for pH, DO, and conductivity measurements, with configurable algorithms per ISO 17025 Annex A.3.
Can calibration data be exported in PDF format compliant with ISO 17025?
Calibration reports are exportable as timestamped, digitally signed PDFs via LabX® Lite; metadata includes uncertainty budgets, reference standard traceability, and environmental conditions during calibration.
Is the IR interface compatible with modern Windows 11 systems without legacy drivers?
Yes—the IR module uses HID-compliant protocols; no additional drivers are required on Windows 10/11 or macOS 12+.
What is the battery life under continuous dual-channel operation?
Up to 2,000 measurements on a single charge (Li-ion, rechargeable via micro-USB); battery status is displayed in real time with low-power warning at ≤15% capacity.
How does the instrument handle electrode drift during extended field use?
The built-in stability algorithm monitors signal variance over 30-second windows and alerts users when drift exceeds ±0.02 pH units/min or ±0.5 mV/min—triggering recalibration prompts before data invalidation occurs.