WTW pH 3310 Portable pH Meter

Overview

The WTW pH 3310 Portable pH Meter is a field-deployable electrochemical analyzer engineered for high-precision, traceable pH, mV, and temperature measurements in demanding environmental, industrial, and regulatory environments. Based on potentiometric measurement principles using a glass electrode and reference system, the pH 3310 delivers laboratory-grade accuracy under real-world conditions—whether in wastewater outfalls, aquaculture ponds, pharmaceutical process water lines, or coastal marine surveys. Its robust design complies with IEC 60529 for IP66/IP67 ingress protection, enabling uninterrupted operation in rain, dust, submersion (up to 1 m for 30 min), and extreme ambient temperatures (–10 °C to +50 °C storage). The instrument implements Automatic Temperature Compensation (ATC) via integrated Pt1000 or NTC sensors, eliminating manual correction errors and ensuring thermodynamic consistency across pH readings per NIST SRM and ISO 3696 standards.

Key Features

• High-resolution measurement capability: pH resolution down to 0.001, with accuracy of ±0.005 pH units in the full range (–2.000 to 19.999)
• Continuous Measurement Control (CMC) — real-time validation logic that flags unstable readings, drift exceeding calibration tolerance, or electrode response anomalies before data capture
• Intelligent calibration management: supports 1–5 point calibration with automatic buffer identification for 16 standardized buffer sets including DIN 19266, NIST SRM, and WTW TEC series; post-calibration electrode status (slope, offset, asymmetry potential) displayed directly on-screen
• Graphical backlit LCD with dynamic trend plotting — enables immediate visualization of pH drift, buffering capacity, or titration-like behavior without external software
• Industrial-grade housing with silicone keypad (100% waterproof, chemical-resistant, wipe-clean surface) and tactile feedback keys for gloved-hand operation
• Extended battery endurance: up to 1000 hours continuous use on standard AA alkaline cells; 150 hours with backlight enabled — validated per IEC 60086-2 cycle testing
• Waterproof USB 2.0 interface (IP67-rated connector) compliant with USB-IF specifications for reliable data transfer to Windows/Linux workstations or mobile devices running WTW LabX Lite

Sample Compatibility & Compliance

The pH 3310 is compatible with all WTW SenTix-series combination electrodes (e.g., SenTix 41, 51, 81), each optimized for specific matrices: SenTix 41 for general-purpose aqueous samples; SenTix 51 for low-conductivity or deionized water; SenTix 81 for aggressive media including HF-containing solutions or high-salinity seawater. Electrode compatibility extends to third-party ISO 8655-compliant BNC or DIN connectors with appropriate adapter kits. The instrument meets EN 61326-1 (EMC), EN 61010-1 (safety), and supports audit-ready workflows aligned with GLP, GMP, and EPA Method 150.1 requirements. Calibration traceability is maintained through documented buffer assignments, timestamped calibration logs, and full metadata embedding (operator ID, location tag, sensor serial number).

Software & Data Management

Data acquisition and reporting are supported via WTW’s PC-based LabX Lite software (included on CD-ROM), which imports *.csv and native *.wtw files directly from the instrument’s internal memory. All 5000 automated records include full contextual metadata: date/time stamp, measured values (pH/mV/°C), electrode diagnostics (slope %, mV offset, response time), calibration history, and user-defined sample IDs. Export formats comply with ASTM D1293 and ISO 10523 reporting templates. For regulated environments, optional LabX Professional enables 21 CFR Part 11 compliance with electronic signatures, role-based access control, and immutable audit trails — critical for QA/QC labs serving FDA-regulated sectors.

Applications

• Environmental monitoring: Surface water (rivers, lakes, estuaries), groundwater wells, wastewater treatment influent/effluent streams, and marine salinity profiling
• Aquaculture & hydroponics: Real-time pH stability tracking in recirculating aquaculture systems (RAS) and nutrient film technique (NFT) channels
• Pharmaceutical water systems: USP purified water and WFI conductivity-pH correlation checks during distribution loop validation
• Food & beverage QC: Batch verification of acidified products (e.g., sauces, dressings), dairy fermentation endpoints, and beverage carbonation stability
• Swimming pool & aquarium management: Routine compliance with WHO Guidelines for Safe Recreational Water Environments and EN 15288-1
• Field emergency response: Rapid deployment for spill characterization (e.g., acid mine drainage, alkali leachate) with GPS-tagged logging via paired tablet integration

FAQ

Does the pH 3310 support GLP-compliant data export?
Yes — all stored measurements include ISO 8601 timestamps, operator codes, calibration certificates, and electrode diagnostic parameters. When used with LabX Lite or LabX Professional, full electronic audit trails and PDF report generation meet GLP Annex 11 and ISO/IEC 17025 documentation requirements.
Can the instrument be used in seawater or high-salinity brines?
Yes — when paired with the SenTix 81 electrode (included in SET 3), the system maintains stable junction potential and minimizes liquid junction error in conductivities >100 mS/cm, complying with ASTM D5128 for marine pH measurement.
Is automatic endpoint detection available during titration-like field tests?
No — the pH 3310 is a direct-reading meter, not a titrator. However, its CMC function and graphical display enable manual endpoint estimation via first-derivative analysis of real-time pH vs. time curves.
What is the recommended recalibration frequency for routine field use?
Per ISO 7888 and WTW Application Note AN-042, recalibration is required before each sampling session, after electrode cleaning, and whenever ambient temperature changes exceed ±5 °C — all enforced by the built-in calibration timer.
Does the USB interface require special drivers on modern Windows/macOS systems?
No — the device enumerates as a standard CDC ACM class USB serial device; no proprietary drivers are needed on Windows 10/11, macOS 12+, or Linux kernels ≥5.4.