WTW Oxi 3210 Portable Dissolved Oxygen Meter

Overview

The WTW Oxi 3210 is a field-deployable, high-reliability dissolved oxygen (DO) meter engineered for precise, traceable measurements in demanding environmental and process water applications. It operates on the Clark-type polarographic principle—utilizing a gas-permeable membrane, cathode/anode electrochemical cell, and diffusion-controlled oxygen reduction current—to deliver stable, low-drift DO concentration (mg/L), saturation (%), and partial pressure (hPa) readings. Integrated with automatic temperature compensation (ATC) and barometric pressure correction, the Oxi 3210 ensures metrological consistency across variable ambient conditions—from sub-zero surface waters to warm industrial effluents. Its ruggedized design, compliant with IP66/IP67 ingress protection, enables uninterrupted operation during rain, dust exposure, or immersion up to 1 m for 30 minutes—making it suitable for routine field surveys, regulatory compliance checks, and long-term monitoring campaigns under GLP-aligned workflows.

Key Features

• Simultaneous measurement of dissolved oxygen (0.00–19.99 mg/L), saturation (0.0–199.9%, extendable to 600%), and temperature (−5.0–105.0 °C) with 0.01 mg/L resolution
• Interchangeable compatibility with WTW’s CellOx 325 (standard) and DurOx 325 (robust, abrasion-resistant) polarographic probes—including 3-m cable variants for deep-water profiling
• 7-segment LCD with high-contrast backlight and oversized characters optimized for outdoor legibility under direct sunlight or low-light conditions
• Silicone-sealed keypad with tactile feedback—fully waterproof, chemically resistant, and easy to decontaminate after exposure to biofouling or saline matrices
• Onboard calibration timer and electrode status indicator post-calibration—supports wet-air saturation method per ISO 5814 and ASTM D888, minimizing maintenance frequency and operator dependency
• Automatic pressure compensation (500–1100 mbar) and ATC eliminate manual correction steps, reducing measurement uncertainty in elevation-variable sites (e.g., mountain streams or coastal zones)
• Configurable auto-read stabilization threshold and programmable auto-off (10 min to 24 h) to conserve battery without compromising data capture integrity
• Extended battery runtime: up to 2500 hours on four AA alkaline cells; removable, sealed battery compartment maintains IP67 integrity during replacement

Sample Compatibility & Compliance

The Oxi 3210 is validated for use across diverse aqueous matrices including wastewater influent/effluent, potable water distribution systems, natural surface waters (rivers, lakes, estuaries), groundwater wells, aquaculture ponds, pharmaceutical process water loops, and food-grade rinse solutions. Its polarographic sensor design exhibits minimal interference from common ions (Cl⁻, NO₃⁻, SO₄²⁻), sulfides, and organic solvents—critical for industrial QC environments. The instrument supports documentation requirements under ISO/IEC 17025-accredited laboratories and aligns with data integrity expectations in FDA-regulated settings: calibration events are timestamped and stored locally (200 entries), while full traceability is maintained via external PC export (via included CD-ROM software). Though not natively 21 CFR Part 11-compliant, audit trails and calibration records meet baseline GLP/GMP record-keeping standards when paired with controlled procedural documentation.

Software & Data Management

Data acquisition is managed through manual entry only—no real-time telemetry or Bluetooth connectivity. Each measurement can be tagged and stored directly on-device (200 manual records), with timestamps and associated temperature/pressure metadata. Export is performed via optional PC connection using WTW’s proprietary software suite (supplied on CD-ROM), enabling CSV or Excel-compatible report generation, trend visualization, and calibration history archiving. While lacking cloud synchronization or multi-user role management, the local storage architecture ensures data sovereignty and operational continuity in offline field deployments—particularly valuable in remote infrastructure audits or emergency response scenarios where network access is unavailable.

Applications

• Regulatory compliance monitoring per EU Bathing Water Directive (2006/7/EC) and US EPA Method 360.1 for recreational water quality
• Wastewater treatment plant optimization—tracking DO profiles in activated sludge basins, aerated lagoons, and denitrification zones
• Ecological assessment of hypoxic zones in lakes and coastal marine environments (e.g., seasonal anoxia mapping)
• Pharmaceutical water system validation—monitoring purified water (PW) and water for injection (WFI) loop DO levels per USP
• Food and beverage process control—verifying deaeration efficacy in carbonated beverage fillers or sterile packaging lines
• Aquaculture health management—ensuring minimum DO thresholds (>5 mg/L) for salmonid or shrimp hatcheries
• Drinking water safety verification at source, treatment outlet, and distribution endpoints per WHO Guidelines for Drinking-water Quality

FAQ

What calibration methods does the Oxi 3210 support?
It uses the wet-air saturation method exclusively—requiring no zero-oxygen solution. This approach complies with ISO 5814 and reduces consumable dependency.
Can the Oxi 3210 measure DO in seawater?
Yes—its pressure compensation and salinity-independent sensor design enable accurate measurements in marine environments up to full oceanic salinity (35 g/kg), provided the probe membrane is intact and electrolyte is fresh.
Is the device compatible with third-party DO probes?
No—only WTW-branded CellOx 325 and DurOx 325 electrodes are electrically and mechanically compatible due to proprietary pinout and polarization voltage requirements.
How is traceability ensured for field-collected data?
Each stored reading includes date/time stamp, temperature, pressure, and sensor ID (when paired with digital probe variants); calibration logs retain date, method, and operator ID if manually entered.
Does the Oxi 3210 meet any international standards for DO measurement?
It conforms to the performance criteria outlined in ISO 5814 (water quality — determination of dissolved oxygen — electrochemical probe method) and ASTM D888 (standard test methods for dissolved oxygen in water).