WTW pH 3310 Portable pH Meter

Overview

The WTW pH 3310 is a high-precision, field-deployable portable pH meter engineered for rigorous electrochemical measurement in environmental monitoring, industrial process control, and laboratory-adjacent applications. Based on potentiometric measurement principles using glass electrode technology, the instrument delivers traceable, stable pH readings across an extended range of –2.000 to 19.999 pH — accommodating highly acidic, neutral, and strongly alkaline aqueous samples encountered in wastewater treatment, aquaculture, pharmaceutical manufacturing, and food & beverage quality assurance. Its architecture integrates robust analog signal conditioning, temperature-compensated electrode response modeling, and real-time stability evaluation via Continuous Measurement Control (CMC), ensuring each displayed value meets predefined metrological criteria before acceptance. Designed as the functional successor to the pH 340i, the pH 3310 introduces enhanced data integrity protocols, expanded buffer recognition logic, and hardened mechanical construction compliant with international field instrumentation standards.

Key Features

• Continuous Measurement Control (CMC): Dynamically validates electrode response stability; alerts users when measured values fall outside calibration validity boundaries or exhibit excessive drift.
• Extended Data Logging Capacity: Stores up to 5,000 timestamped, automatically triggered measurements — ideal for unattended long-term monitoring in rivers, effluent channels, or aquaculture basins.
• Graphical Backlit LCD Display: High-contrast monochrome screen with intuitive icon-based navigation and real-time trend plotting — fully operable under low-light or nocturnal field conditions.
• Ruggedized Enclosure: IP66/IP67-rated housing with silicone keypad provides resistance to dust ingress, water immersion (up to 1 m for 30 min), and mechanical shock per IEC 60068-2-6 and IEC 60068-2-27.
• Intelligent Calibration Management: Supports 1–5 point calibration with automatic identification of 16 standardized buffer solutions (including DIN 19266, NIST SRM, and WTW TEC series); displays electrode slope, offset, and asymmetry potential post-calibration.
• Automatic Temperature Compensation (ATC): Integrated Pt1000 sensor enables real-time correction using either Nernstian or user-defined temperature coefficients.
• Waterproof USB Interface: Enables secure, high-speed transfer of logged datasets and calibration reports to Windows/macOS systems without requiring proprietary docking stations.
• Long-Term Power Efficiency: Operates up to 1000 hours on four AA alkaline cells; optional NiMH rechargeable battery pack maintains full functionality with integrated charge-state monitoring.

Sample Compatibility & Compliance

The pH 3310 is validated for use with standard combination pH electrodes (e.g., SenTix® series) and redox (ORP) sensors meeting ISO 7027 and ASTM D1293 specifications. It complies with EN 61326-1 (EMC for laboratory equipment), EN 61010-1 (safety requirements for electrical equipment), and supports audit-ready operation in regulated environments. While not inherently 21 CFR Part 11–compliant out-of-the-box, its immutable calibration logs, timestamped data records, and CMC event flags provide foundational traceability required for GLP and GMP-aligned workflows. Electrode diagnostics — including slope (%), zero point (mV), and response time — are retained with each calibration entry, facilitating preventive maintenance scheduling per ISO/IEC 17025 clause 6.4.10.

Software & Data Management

Data export is performed via native USB mass-storage mode — no driver installation required. Logged files are saved in CSV format with ISO 8601 timestamps (YYYY-MM-DD HH:MM:SS), electrode ID, calibration metadata, and CMC status flags. Optional WTW LabX® Light software (sold separately) enables batch analysis, statistical reporting (mean, SD, min/max), and automated compliance summaries aligned with ISO 5725 and USP . All internal memory operations adhere to write-cycle endurance limits defined in IEC 60747-5-3, ensuring >100,000 read/write cycles over device lifetime.

Applications

• Environmental Monitoring: In-situ pH profiling of surface waters (lakes, estuaries, coastal zones), groundwater wells, and wastewater influent/effluent streams.
• Aquaculture & Fisheries: Real-time pH and temperature tracking in recirculating aquaculture systems (RAS), hatcheries, and pond management.
• Pharmaceutical Water Systems: Conductivity and pH verification of purified water (PW) and water for injection (WFI) per USP and EP 2.2.38.
• Food & Beverage Processing: Batch-wise pH verification during fermentation, pasteurization, and cleaning-in-place (CIP) validation.
• Swimming Pool & Spa Management: Routine disinfection efficacy assessment via pH and ORP correlation.
• Educational Laboratories: Teaching core electrochemical concepts including Nernst equation derivation, liquid junction potential, and electrode aging behavior.

FAQ

What calibration buffers are supported?
The pH 3310 auto-recognizes 16 standardized buffers, including DIN 19266 (pH 1.678, 4.005, 6.865, 9.180), NIST (pH 1.679, 4.015, 6.862, 9.180, 12.454), and WTW TEC series (pH 2.00, 3.00, 7.00, 10.00, 12.00).
Does the instrument support GLP-compliant record keeping?
Yes — all calibrations and measurements are permanently timestamped, include operator ID fields (configurable), and retain full electrode diagnostic parameters. Audit trails can be exported in CSV for external review.
Can it measure ORP (redox potential)?
Yes — the pH 3310 measures mV in ±1200.0 mV (high-resolution) and ±2500 mV (extended) ranges with accuracy of ±0.3 mV and ±1 mV respectively.
Is temperature compensation mandatory?
ATC is enabled by default but may be disabled for manual temperature input or non-aqueous applications where fixed compensation is preferred.
How is data integrity ensured during USB transfer?
The waterproof USB interface implements CRC-16 error checking and write-verification handshaking; incomplete transfers trigger automatic retry or error flagging in the device log.