WTW PH/ION 3310 Portable pH and Ion Concentration Meter

Overview

The WTW PH/ION 3310 is a high-precision portable pH and ion-selective electrode (ISE) meter engineered for field-deployable electrochemical analysis in environmental monitoring, industrial process control, wastewater treatment, and academic research laboratories. Based on potentiometric measurement principles—employing Nernst equation-based voltage detection across glass pH electrodes, redox-sensitive ORP electrodes, and ion-selective membranes—the instrument delivers trace-level quantification of hydrogen ion activity (pH), oxidation-reduction potential (ORP), specific ion concentrations (e.g., F⁻, Cl⁻, NO₃⁻, NH₄⁺, Ca²⁺), and temperature-corrected readings. Its modular analog input architecture accepts all standard DIN-compatible pH, ORP, and ISE electrodes—including combination, half-cell, and reference configurations—enabling method flexibility without hardware modification. Designed and manufactured in Germany under stringent ISO 9001 quality management protocols, the PH/ION 3310 meets the operational rigor required for GLP-compliant fieldwork and routine QC/QA applications where portability must not compromise metrological integrity.

Key Features

• True multi-parameter capability: Simultaneous real-time measurement and display of pH, ORP, ISE, and temperature with automatic temperature compensation (ATC) using integrated Pt1000 sensor or manual entry.
• Advanced calibration architecture: Up to 5-point pH calibration with slope and offset validation; up to 7-point ISE calibration with linear or non-linear (Grafe, Gran) evaluation methods for improved low-concentration accuracy.
• Robust field-grade construction: IP67-rated enclosure ensures full dust ingress protection and immersion resistance up to 1 m for 30 minutes—validated per IEC 60529—making it suitable for outdoor sampling in rain, mud, or splash-prone environments.
• Extended battery endurance: 800 hours of continuous operation on four AA alkaline cells; optional NiMH rechargeables supported (external charger required); programmable auto-off from 10 minutes to 24 hours minimizes power waste.
• Comprehensive data governance: Built-in GLP-compliant audit trail logs date/time stamps, operator ID (user-definable), electrode ID, calibration history, and measurement metadata for regulatory traceability.
• USB 1.1 device-mode interface: Enables direct connection to Windows/Linux PCs without drivers; supports bulk export of raw measurement series, calibration reports, and event logs in CSV format for LIMS integration or statistical post-processing.

Sample Compatibility & Compliance

The PH/ION 3310 interfaces with a broad spectrum of commercially available analog electrodes compliant with DIN 19262 and ASTM D1293 standards. It supports single-junction and double-junction pH electrodes, platinized platinum or Ag/AgCl ORP electrodes, and solid-state or liquid-membrane ISEs—including fluoride, nitrate, ammonium, calcium, sodium, and chloride sensors. All measurements adhere to ISO 7888 (pH of water), ISO 5814 (ORP), and ISO 10523 (electrochemical determination of ions in aqueous solutions). The instrument’s firmware implements internal diagnostics for electrode impedance, asymmetry potential, and response time—flagging deviations beyond user-defined thresholds. Full compliance with EU RoHS Directive 2011/65/EU and CE marking per EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU is certified. While not natively 21 CFR Part 11 compliant, audit trail exports support validation protocols under FDA-regulated environments when paired with validated laboratory SOPs.

Software & Data Management

Data acquisition and reporting are managed via embedded firmware—not external software—ensuring deterministic behavior and immunity to OS-level instability. Manual storage accommodates 500 discrete readings with timestamp and parameter tags; automatic logging captures up to 5000 sequential values at user-configurable intervals (1 s to 60 min). Each stored record includes measured value, unit, temperature, electrode status, and calibration ID. Calibration data—up to 10 complete sessions—is retained with slope, offset, buffer IDs, and deviation metrics. USB export generates timestamped, tab-delimited .csv files containing column headers compatible with Excel, MATLAB, Python pandas, and ELN platforms. No proprietary file formats or vendor lock-in is employed. Firmware updates are delivered via downloadable .hex files and applied through the USB interface using WTW’s publicly documented bootloader protocol.

Applications

• Environmental field surveys: In-situ pH and nitrate monitoring in rivers, lakes, and groundwater wells; soil pore-water extraction analysis using ISEs for ammonium or potassium.
• Municipal and industrial wastewater: Real-time ORP trending during biological denitrification; chloride ISE verification in membrane filtration reject streams.
• Food & beverage QA: pH stability checks in dairy fermentation tanks; salt (Na⁺) concentration profiling in brining solutions.
• Academic teaching labs: Electrochemistry experiments demonstrating Nernstian behavior, selectivity coefficients, and activity vs. concentration effects.
• Pharmaceutical water systems: Conductivity-independent pH verification of purified water (PW) and water-for-injection (WFI) distribution loops per USP .

FAQ

Does the PH/ION 3310 support automatic temperature compensation (ATC) for all measurement modes?

Yes—ATC is applied in real time to pH, ORP, and ISE readings using either the integrated Pt1000 sensor or an external temperature probe connected via the auxiliary port.
Can ISE calibration curves be saved and recalled for different analytes?

Yes—up to 10 independent calibration sets (including slope, intercept, and unit configuration) are stored non-volatile memory and can be selected per measurement session.
Is the USB interface compatible with modern operating systems including Windows 11 and macOS?

Yes—the USB 1.1 device-class implementation requires no drivers on Windows 7+, macOS 10.14+, or current Linux distributions with standard CDC ACM support.
What is the minimum detectable concentration for fluoride using a standard LaF₃ ISE?

Detection limit depends on electrode quality and sample matrix; typical practical LOD is ~0.02 mg/L (1 µM) under optimized conditions with proper ionic strength adjustment.
Does the instrument meet any international standards for measurement uncertainty?

While no single “uncertainty certification” is issued, its stated accuracy specifications align with ISO/IEC 17025 requirements for in-house verification, and all calibrations may be traced to NIST SRMs via WTW-certified buffer and standard solutions.