Metrohm 827 Desktop pH Meter

Overview

The Metrohm 827 Desktop pH Meter is a precision electrochemical instrument engineered for routine and regulated pH, mV, and temperature measurements in quality control laboratories, academic research facilities, and industrial process support environments. Built upon Metrohm’s decades-long heritage in potentiometric measurement science, the 827 operates on the fundamental Nernst equation principle—measuring the potential difference between a pH-sensitive glass electrode and a stable reference electrode to determine hydrogen ion activity in aqueous solutions. Its extended operational range supports both standard pH measurements (0–14) and non-aqueous or highly acidic/alkaline applications (pH –8 to 22), enabling method flexibility across pharmaceutical formulation, water treatment validation, food safety testing, and chemical synthesis monitoring. Designed for compliance-ready workflows, the instrument features traceable calibration protocols, built-in electrode diagnostics, and robust hardware architecture suited for continuous daily use in ISO/IEC 17025-accredited labs.

Key Features

• Extended measurement capability: pH range –8 to 22, ±1200 mV potential, and temperature from –150.0 °C to +250.0 °C (with Pt1000 sensor) or –5.0 °C to +250.0 °C (with NTC sensor)
• High-resolution display and data acquisition: 0.001 pH unit, 0.1 mV, and 0.1 °C resolution ensure detection of subtle electrochemical shifts critical for method validation and stability studies
• Integrated infrared (IR) communication interface: Enables secure, cable-free bidirectional data exchange with Metrohm-certified thermal printers and Windows-based PCs—eliminating USB port dependency and reducing contamination risk in cleanroom or glovebox settings
• Compact benchtop form factor: Optimized footprint (205 × 210 × 95 mm) minimizes lab space requirements without compromising ergonomics or accessibility to controls and ports
• Swiss-engineered reliability: Manufactured in Herisau, Switzerland under strict ISO 9001 and ISO 13485 quality management systems; all units undergo individual functional verification prior to shipment

Sample Compatibility & Compliance

The Metrohm 827 is compatible with all standardized combination pH electrodes (BNC or DIN connectors), refillable and gel-filled reference systems, and temperature probes meeting IEC 60751 (Pt1000) or IEC 60751-derived NTC specifications. It supports single-point, two-point, and multi-point calibration using NIST-traceable buffer standards (e.g., pH 4.01, 7.00, 10.01 at 25 °C). The instrument complies with key regulatory frameworks including ASTM E70 (Standard Test Method for pH of Aqueous Solutions), USP (pH Measurement), and EU Pharmacopoeia 2.2.3. Data integrity is reinforced via automatic timestamping, user ID logging (with optional password protection), and non-volatile memory retention—even during power interruption. While not inherently 21 CFR Part 11 compliant out-of-the-box, the 827 integrates seamlessly with Metrohm’s LabX software platform for full audit trail, electronic signature, and role-based access control in GxP environments.

Software & Data Management

Raw measurement data—including pH, mV, temperature, date/time stamp, electrode ID, and calibration history—are stored internally (up to 2000 records) and exportable via IR link in CSV or TXT format. When paired with LabX Lite (free download), users gain real-time graphing, statistical analysis (mean, SD, RSD), and automated report generation aligned with GLP documentation requirements. All exported files retain embedded metadata required for laboratory accreditation audits. Firmware updates are delivered via Metrohm’s secure online portal and applied through IR transfer—ensuring long-term instrument maintainability without service engineer intervention.

Applications

• Pharmaceutical QC: Dissolution media pH verification per USP , buffer preparation checks, and cleaning validation swab sample analysis
• Environmental monitoring: Surface water, wastewater, and leachate pH profiling in accordance with EPA Method 150.1 and ISO 10523
• Food & beverage: Fermentation pH tracking, shelf-life stability testing, and acidulant titration endpoint confirmation
• Academic teaching labs: Electrochemistry fundamentals instruction, Nernst equation validation experiments, and electrode response kinetics studies
• Chemical manufacturing: Reaction mixture pH control during batch synthesis and catalyst performance evaluation

FAQ

Does the Metrohm 827 support automatic temperature compensation (ATC)?

Yes—it accepts input from either Pt1000 or NTC temperature sensors and applies real-time ATC using the built-in coefficient tables per IUPAC and DIN 19269.
Can the 827 be used with non-aqueous solvents?

It is validated for pH measurements in mixed aqueous-organic systems (e.g., ethanol/water, methanol/water) within its extended –8 to 22 range; electrode selection and calibration buffer compatibility must be verified per ISO 17025 method validation guidelines.
Is calibration data stored per electrode or per instrument?

Calibration records—including slope, offset, and isopotential point—are saved per electrode ID, enabling traceability across multiple sensors used on a single 827 unit.
What is the warranty coverage for the Metrohm 827?

Metrohm provides a standard 24-month limited warranty covering parts and labor for defects in materials and workmanship, extendable to 36 months with annual service contract enrollment.
Does the IR interface require line-of-sight operation?

Yes—the integrated IrDA 1.1-compliant transceiver requires unobstructed optical path (≤30 cm distance) for reliable data transmission; ambient light interference is minimized via adaptive signal filtering.