WTW pH 3310 Portable pH/mV/Temperature Meter

Overview

The WTW pH 3310 is a rugged, field-deployable benchtop-grade portable meter engineered for precise, traceable, and operationally robust measurement of pH, redox potential (mV), and temperature in demanding environmental, industrial, and quality control applications. Unlike optical spectrophotometers — which rely on absorbance at specific wavelengths — the pH 3310 operates on electrochemical potentiometry: it measures the potential difference across a glass pH electrode versus a stable reference electrode, converting the Nernstian voltage response into calibrated pH values with automatic temperature compensation. Its design prioritizes metrological integrity under variable ambient conditions, making it suitable for GLP-compliant field sampling, wastewater monitoring, aquaculture management, and pharmaceutical water system validation where regulatory documentation and measurement repeatability are critical.

Key Features

• High-resolution pH measurement down to 0.001 pH units, with user-selectable resolution settings to match application requirements.
• Simultaneous measurement of pH, mV (ORP), and temperature — all displayed concurrently on a large, high-contrast 7-segment LCD for rapid visual verification.
• Full IP66/IP67 ingress protection: dust-tight and capable of temporary submersion; validated for continuous outdoor use in rain, snow, or high-humidity environments.
• Tactile, silicone-sealed keypad with audible and haptic feedback ensures reliable operation with gloves or wet hands — essential for field technicians and plant operators.
• Intelligent calibration logic with automatic buffer recognition for 16 standard buffers (including DIN 19266, NIST SRM, and WTW TEC series), reducing operator error and supporting audit-ready calibration records.
• Integrated calibration timer and electrode status indicator provide real-time feedback on sensor health and measurement stability — critical for maintaining data integrity per ISO/IEC 17025 and USP water quality protocols.
• Automatic endpoint detection with configurable hold time (15 s default) and CMC (Constant Measurement Condition) logic ensures consistent reading acquisition across variable sample matrices.
• Long-life power architecture: up to 2500 hours of continuous operation on four AA alkaline cells; battery compartment is fully sealed and removable for quick replacement without compromising enclosure integrity.

Sample Compatibility & Compliance

The pH 3310 interfaces seamlessly with WTW’s full line of SenTix-series combination electrodes (e.g., SenTix 21, 41, 81), as well as third-party ISO-standard pH and ORP electrodes featuring BNC or DIN connectors. It supports aqueous samples across a broad conductivity range (10 µS/cm to 1 S/cm) and is validated for use with natural waters (freshwater, seawater, groundwater), process streams, pharmaceutical purified water (PW) and water-for-injection (WFI) distribution loops, food-grade brines, and bioreactor effluents. The instrument complies with IEC 61000-6-2 (immunity) and IEC 61000-6-3 (emissions), and its calibration traceability aligns with ISO 17511 and ASTM D1293 for pH measurement in water. While not inherently 21 CFR Part 11 compliant due to lack of electronic signature capability, raw data output (via optional analog interface or manual transcription) meets GLP documentation requirements when paired with controlled calibration logs and electrode maintenance records.

Software & Data Management

The pH 3310 operates as a standalone, embedded-system meter with no internal data logging or USB/Bluetooth connectivity. All measurements are displayed in real time and intended for immediate recording in field notebooks or LIMS-integrated workflows. Calibration parameters — including date/time stamp, buffer IDs used, slope (%), offset (mV), and electrode impedance — are retained in non-volatile memory and visible on-screen post-calibration. For laboratories requiring digital archiving, WTW recommends pairing the pH 3310 with external data loggers or using its analog output (0–20 mA or 4–20 mA, optional module) for integration into SCADA or PLC-based monitoring systems. Firmware updates are performed via PC using WTW LabX Lite software (included on supplied CD-ROM), supporting version control and configuration backup per ISO/IEC 17025 clause 5.9.

Applications

• Environmental monitoring: Real-time pH profiling of rivers, lakes, estuaries, and wastewater treatment influent/effluent streams.
• Aquaculture and hydroponics: Daily tracking of pond and recirculating aquaculture system (RAS) water chemistry to prevent stress-induced mortality.
• Pharmaceutical manufacturing: On-site verification of purified water (PW) and clean steam condensate per USP and EU GMP Annex 1.
• Food & beverage QA/QC: Batch testing of dairy products, brewing wort, fruit juices, and brine solutions where pH directly impacts microbial stability and shelf life.
• Swimming pool & spa management: Routine compliance checks against EN 15288 and local public health regulations.
• Chemical process control: Monitoring neutralization reactions, titration endpoints, and corrosion inhibitor efficacy in cooling towers and boiler feedwater.

FAQ

Does the pH 3310 support data export or Bluetooth connectivity?

No — the pH 3310 is a dedicated field meter with no built-in memory, USB port, or wireless interface. Data must be manually recorded or captured via optional analog current output.

Can it be used with non-WTW electrodes?

Yes, provided the electrode uses a standard BNC or DIN connector and complies with ISO 3696 or IUPAC reference electrode specifications.

What is the recommended recalibration frequency?

Per ISO 5725 and ASTM D1293, recalibration is required before each measurement session, after electrode cleaning, and whenever ambient temperature changes exceed ±5 °C.

Is the device suitable for measuring highly viscous or suspended samples?

It is optimized for low-to-medium conductivity aqueous solutions. For slurries or high-solids content, use a flow-through cell or temperature-compensated open-junction electrode to minimize junction clogging.

How is traceability maintained during field use?

By documenting calibration date, buffer lot numbers, electrode ID, slope/offset values, and ambient temperature — all of which are visible on-screen and retained in instrument memory.