Metrohm 867 Advanced pH Meter Module

Overview

The Metrohm 867 Advanced pH Meter Module is a precision-engineered electrochemical measurement unit designed for high-integrity pH, redox potential (mV), temperature, and ion-selective electrode (ISE) applications in regulated laboratory environments. Unlike conventional handheld pH meters, the 867 operates as a modular analytical component—capable of autonomous deployment or seamless integration into Metrohm’s Titrando® automated titration platforms and tiamo™ software ecosystem. Its architecture is grounded in potentiometric measurement principles: it measures the potential difference between a reference electrode and an indicator electrode immersed in solution, converting the Nernstian response into calibrated pH or ion activity values. The module supports both analog electrodes and Metrohm’s iTronde™ smart electrodes, which embed digital calibration memory, sensor diagnostics, and automatic electrode identification—reducing operator error and enhancing traceability.

Key Features

• Modular design enabling flexible deployment: functions as a standalone pH/mV/temperature/ISE meter or as a core subsystem within automated titration workflows.
• Full compatibility with iTronde™ intelligent electrodes—enabling plug-and-play recognition, auto-loaded calibration history, real-time electrode health monitoring, and secure firmware updates.
• Support for up to 9-point calibration sequences across pH, mV, and ISE modes—facilitating high-accuracy interpolation and non-linear response compensation.
• Dual operational interface: local control via optional integrated touch display (model 2.867.0110) or remote configuration and monitoring through tiamo™ software (model 2.867.0210).
• Robust connectivity infrastructure: two standard USB ports for peripheral devices (e.g., printers, flash drives) and four Metrohm Serial Bus (MSB) ports for daisy-chaining with burettes, dosing units, sample changers, and other Metrohm instruments.
• FDA 21 CFR Part 11 compliance enabled via audit-trail-enabled software integration—ensuring electronic records integrity, user authentication, and immutable event logging required for pharmaceutical, clinical, and food safety QA/QC labs.

Sample Compatibility & Compliance

The 867 module accommodates a broad range of aqueous and semi-aqueous samples—including buffers, biological fluids, fermentation broths, environmental water, and process streams—provided they fall within the operational temperature range of 0–100 °C and exhibit conductivity ≥50 µS/cm. When used with appropriate electrodes (e.g., double-junction Ag/AgCl reference, gel-filled pH electrodes, or solid-contact ISEs), it meets ISO 3696 (Grade 3 water), ASTM D1293 (pH of water), and USP specifications for pH measurement in pharmaceutical preparations. Its hardware design adheres to IEC 61010-1 safety standards for electrical equipment for measurement, control, and laboratory use.

Software & Data Management

Data acquisition, calibration management, and report generation are handled either locally (via touch interface firmware) or centrally through Metrohm tiamo™ v3.x or higher. The software provides full GLP/GMP support: electronic signatures, role-based access control, customizable report templates (PDF/CSV), and time-stamped audit trails for all critical events—including calibration, measurement, parameter changes, and user logins. All raw sensor data—including millivolt readings, temperature compensation values, and electrode impedance diagnostics—are stored with metadata (operator ID, timestamp, method ID, instrument serial number), satisfying regulatory requirements for data integrity and retrospective review.

Applications

• Pharmaceutical QC: pH verification of injectables, ophthalmic solutions, and buffer preparation per USP monographs.
• Environmental monitoring: field-deployable pH and redox profiling in wastewater treatment plants and surface water sampling campaigns.
• Food & beverage R&D: acidification kinetics, shelf-life stability testing, and ISE-based sodium/nitrate quantification in processed foods.
• Academic electrochemistry: teaching potentiometric theory, Nernst equation validation, and multi-parameter sensor characterization.
• Industrial process support: inline pH trending during bioreactor runs when paired with flow cells and Metrohm’s Dosino® dispensing modules.

FAQ

Can the 867 operate without tiamo™ software?
Yes—the 867 functions autonomously with onboard calibration routines and direct readout; tiamo™ is required only for advanced automation, audit trails, or integration with titration hardware.
Is electrode calibration data stored on the iTronde™ or the 867 module?
Calibration parameters reside in the iTronde™’s internal memory and are automatically transmitted to the 867 upon connection; manual re-entry is unnecessary.
Does the 867 support GLP-compliant printouts?
Yes—when connected to a USB printer and configured via tiamo™, it generates compliant reports with header metadata, calibration certificates, and signature fields.
What is the maximum number of ISEs supported simultaneously?
The module supports one ISE channel at a time; sequential multi-ion analysis requires manual electrode swapping and method reconfiguration.
Are firmware updates performed via USB or MSB?
Firmware updates are delivered via USB using Metrohm’s official update utility; MSB is reserved for real-time instrument communication, not firmware loading.