FangZhou PHS-10 Portable pH Meter

Overview

The FangZhou PHS-10 Portable pH Meter is a microprocessor-controlled electrochemical instrument engineered for field-deployable and laboratory-grade pH, mV, ORP, and temperature measurements. Based on potentiometric principle—measuring the potential difference between a pH-sensitive glass electrode and a stable reference electrode—the PHS-10 delivers high reproducibility and stability across extreme pH ranges (−5.00 to 20.00). Its design adheres to fundamental electrochemical standards, including ISO 3696 (water purity for calibration), ASTM D1293 (pH of water), and USP (pH measurement in pharmaceutical preparations). The instrument’s input impedance exceeds 1 × 10¹² Ω, minimizing loading effects on high-impedance electrodes and ensuring accurate readings even with aged or low-output sensors. Integrated automatic temperature compensation (ATC) supports both probe-based and manual input modes, enabling precise correction per the Nernst equation across −5.0 to 105.0 °C.

Key Features

• High-resolution LCD display with intuitive touch-key interface for glove-compatible operation in field environments
• Programmable auto-shutdown (default 10 minutes; adjustable from 1–60 min) to conserve battery life
• Dual power architecture: operates on two AA alkaline cells (typical runtime >200 hours) or external DC 5 V / 300 mA supply (center-positive polarity)
• Intelligent buffer recognition during calibration—automatically identifies standard NIST-traceable solutions (pH 4.00, 6.86, 9.18 at 25 °C) without manual selection
• Signal balancing function dynamically adjusts amplifier response characteristics to reduce stabilization time by up to 40% compared to conventional analog circuits
• Non-volatile memory retains calibration coefficients and 200 timestamped measurement records—even after power loss
• Ergonomic, IP54-rated housing designed for portability, splash resistance, and one-handed operation in outdoor or industrial settings

Sample Compatibility & Compliance

The PHS-10 is compatible with all standard BNC-type pH electrodes and Pt100/NTC temperature probes meeting IEC 60746-1 requirements. It supports aqueous, semi-aqueous, and low-ionic-strength samples—including wastewater, soil extracts, food slurries, and electroplating baths—within its specified pH and temperature envelope. Calibration traceability aligns with NIST Standard Reference Materials (SRMs), facilitating compliance with ISO/IEC 17025 accreditation requirements for testing laboratories. While not FDA 21 CFR Part 11–compliant out-of-the-box (lacking electronic signature and audit trail functionality), the device meets GLP documentation prerequisites when used with controlled calibration logs and validated electrode handling protocols. It conforms to EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU for CE-marked operation in EU member states.

Software & Data Management

Data export is performed via manual transcription or optional USB-to-serial adapter (not included). Each stored record includes pH/mV/ORP value, temperature reading, date/time stamp, and calibration status flag. The internal memory structure follows a first-in-first-out (FIFO) overwrite policy beyond 200 entries. No proprietary software is bundled; however, exported CSV-formatted data is interoperable with LIMS platforms, Excel, and statistical analysis tools such as JMP or Minitab. For regulated environments requiring full audit trails, users are advised to implement external documentation systems compliant with ISO 15197 (in vitro diagnostic devices) or CLIA guidelines.

Applications

• Environmental monitoring: pH profiling of surface water, groundwater, leachate, and sediment pore water per EPA Method 150.1
• Food & beverage QC: Acidification control in dairy processing, juice production, and fermentation tanks
• Academic teaching labs: Electrochemistry demonstrations, Nernst equation validation, and buffer capacity studies
• Industrial process support: Monitoring caustic cleaning solutions (pH >14), acid pickling baths (pH <0), and electrochemical plating electrolytes
• Pharmaceutical water systems: USP Purified Water and Water for Injection (WFI) verification per pharmacopeial monographs

FAQ

What calibration standards are supported?
The PHS-10 automatically recognizes common NIST-traceable buffer solutions: pH 4.00, 6.86, and 9.18 at 25 °C. Custom buffers may be used in manual mode but require user-entered nominal values.

Does the instrument support GLP-compliant data recording?
It stores 200 measurements with timestamps and calibration metadata, satisfying basic GLP data retention requirements. Full GLP compliance (e.g., operator ID, reason-for-change logging) requires external procedural controls.

Can I use non-BNC electrodes?
Only BNC-compatible pH and temperature electrodes are electrically and mechanically supported. Adapters for DIN or other connectors are not provided and may compromise signal integrity.

Is temperature compensation mandatory during pH measurement?
No—manual temperature entry is permitted. However, automatic compensation using an integrated or external probe is strongly recommended to minimize systematic error from thermal drift.

What is the warranty coverage?
The instrument carries a 36-month limited warranty on the main unit. Electrodes and consumables are excluded. Warranty service is administered through authorized FangZhou distributors under ISO 9001-certified quality procedures.