Eutech pH700 Benchtop pH/ORP/Temperature Meter

Overview

The Eutech pH700 is a benchtop electrochemical meter engineered for precision pH, oxidation-reduction potential (ORP), and temperature measurements in quality control laboratories, academic research settings, and industrial process support environments. Based on potentiometric measurement principles, the instrument utilizes high-impedance input circuitry (>10¹² Ω) to ensure minimal current draw from pH electrodes—critical for maintaining signal integrity and long-term electrode stability. Its dual-parameter architecture enables simultaneous acquisition of pH and ORP data with independent calibration pathways, while integrated temperature sensing supports automatic or manual temperature compensation per ASTM D1293 and ISO 10523 standards. Designed and assembled under Eutech’s Singapore-based quality management system (ISO 9001 certified), the pH700 meets international requirements for routine analytical instrumentation used in GLP-compliant workflows.

Key Features

• High-resolution dual-line LCD display (5.6 × 7.5 cm) with backlight-independent contrast for consistent readability under varied ambient lighting conditions
• Up to 5-point pH calibration using user-selectable buffer standards (USA and NIST traceable), with real-time slope and offset diagnostics displayed during and after calibration
• Auto-buffer recognition reduces operator error and accelerates setup—compatible with standard pH 4.01, 7.00, 10.01, and custom buffers
• Stable reading indicator provides visual confirmation when measurement drift falls below 0.01 pH/min, ensuring reproducible endpoint determination
• GLP-compliant data handling: stores 100 timestamped readings with associated calibration metadata (date/time, buffer IDs, slope %, offset mV)
• Rugged mechanical design (650 g net weight) with chemical-resistant ABS housing rated IP20 for benchtop use in controlled laboratory environments
• Flexible connectivity: BNC input for combination or separate pH/ORP electrodes; dual phono jacks for ATC (automatic temperature compensation) probes and reference electrodes

Sample Compatibility & Compliance

The Eutech pH700 accommodates standard glass-body pH electrodes (e.g., double-junction, refillable, or gel-filled), redox electrodes (platinum or gold tip), and industry-standard ATC sensors (e.g., 10 kΩ thermistors). It supports aqueous samples across wide pH extremes (–2.00 to 16.00) and elevated temperatures (up to 100.0 °C), making it suitable for aggressive cleaning solutions, alkaline electrolytes, and low-ionic-strength environmental waters. The instrument conforms to IEC 61010-1 safety standards for electrical equipment and incorporates electromagnetic compatibility (EMC) shielding per EN 61326-1. While not FDA 21 CFR Part 11–certified out-of-the-box, its GLP features—including immutable calibration logs and full parameter traceability—facilitate validation in regulated pharmaceutical, food, and water testing labs operating under USP , ISO/IEC 17025, or EPA Method 150.1 frameworks.

Software & Data Management

Data export is performed manually via recorded values on the LCD interface; the pH700 does not feature USB, Bluetooth, or RS-232 output ports. All stored entries include date/time stamps, measured pH/ORP values, temperature, calibration slope (%), and offset (mV)—enabling retrospective audit trails without external software dependency. Calibration history remains accessible for up to 100 cycles, supporting internal QA review and external inspection readiness. For laboratories requiring electronic record integration, third-party data loggers may be interfaced through analog voltage outputs (not included), though native digital communication is not supported.

Applications

• Quality assurance of buffer solutions, titrants, and reagent-grade chemicals in pharmaceutical manufacturing
• pH and redox monitoring in wastewater treatment processes (e.g., denitrification, chlorination control)
• Electrochemical characterization of battery electrolytes and fuel cell membranes
• Environmental water analysis per APHA Standard Methods 4500-H⁺ and EPA 150.1
• Educational laboratory instruction in analytical chemistry and electrochemistry curricula
• Calibration verification of inline pH sensors in pilot-scale bioreactors and purification systems

FAQ

Does the pH700 support automatic temperature compensation (ATC) for both pH and ORP measurements?
ATC is applied exclusively to pH measurements per IUPAC-recommended Nernstian correction; ORP values are reported at measured temperature without compensation.
Can the instrument store calibration data separately for multiple electrodes?
No—the pH700 retains only the most recent calibration set; electrode-specific profiles require manual documentation by the user.
Is the 9 V power adapter included with the unit?
Yes, a regulated 9 V DC switching-mode power supply (100–240 VAC input) is supplied as standard equipment.
What is the maximum allowable input impedance for connected pH electrodes?
The meter’s input impedance exceeds 10¹² Ω, compatible with all commercial glass pH electrodes meeting DIN 19265 or ASTM E70 specifications.
Does the pH700 meet requirements for ISO/IEC 17025 accredited testing laboratories?
Its GLP functionality, documented calibration traceability, and metrological specifications align with Clause 6.4.10 (equipment verification) and Clause 7.7 (result reporting) of ISO/IEC 17025:2017, subject to laboratory-specific validation protocols.