Thermo Scientific Orion 320D-01 Precision Portable Dissolved Oxygen (DO) Meter
| [Origin | USA |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | 320D-01 |
| Price | Upon Request |
| DO Range | 0.00–90.0 mg/L |
| DO Resolution | 0.1 / 0.01 mg/L |
| DO Saturation Range | 0.0–600% |
| DO Saturation Resolution | 1 / 0.1% |
| DO Accuracy | ±0.5% ±1 digit |
| Salinity Compensation | 0–45 ppt |
| Barometric Pressure Range | 450–850 mmHg |
| Calibration Modes | Water-saturated air, air-saturated water, Winkler titration zero-point |
| Electrode Type | Polarographic membrane electrode |
| Temperature Range | −5 to 105°C |
| Temp Resolution | 0.1°C (−5 to 99.9°C), 1.0°C (>99.9°C) |
| Temp Accuracy | ±0.1°C |
| Temp Compensation | Automatic/manual |
| Display | Backlit LCD |
| Sensor Interfaces | DO-miniDIN, Temp-miniDIN, Stirrer-phone jack (benchtop only) |
| Communication | Bidirectional RS232, optional USB cable |
| GLP Features | 200 data points, last 10 calibrations stored, 10 user methods, self-test diagnostics, password protection, network-enabled firmware/method updates |
| Power | 4×AA batteries |
| Certifications | CE, CSA, UL, TÜV, FCC Class A |
| Operating Environment | 5–45°C, 5–85% RH |
| IP Rating | Benchtop—IP54 |
Overview
The Thermo Scientific Orion 320D-01 Precision Portable Dissolved Oxygen (DO) Meter is a rigorously engineered electrochemical analyzer designed for high-fidelity field and laboratory measurement of dissolved oxygen concentration in aqueous media. Based on Clark-type polarographic membrane electrode technology, it delivers trace-level sensitivity and long-term stability across diverse environmental matrices—including freshwater, seawater, wastewater, and biological reactors. The instrument implements three-point calibration traceability (water-saturated air, air-saturated water, and Winkler-based zero-point adjustment), ensuring compliance with U.S. EPA Method 4500-OG, ASTM D888, and ISO 5814. Its dual-mode output (mg/L and % saturation) supports both regulatory reporting and process optimization workflows, while integrated barometric pressure, temperature, and salinity compensation algorithms eliminate manual correction errors inherent in legacy DO systems.
Key Features
- Polarographic membrane sensor architecture with built-in stirring capability—ensures rapid equilibration, minimizes boundary layer effects, and improves reproducibility (RSD < 1.2% over 10 replicate measurements in natural surface water).
- Smart Stability™ adaptive signal processing—dynamically adjusts response threshold based on real-time signal noise, reducing time-to-stable reading by up to 40% compared to fixed-interval averaging.
- Smart Averaging™ algorithm—applies weighted moving average with outlier rejection, enhancing accuracy in turbulent or particulate-laden samples without sacrificing temporal resolution.
- Full environmental compensation suite: automatic barometric pressure correction (450–850 mmHg), NIST-traceable temperature compensation (−5 to 105°C), and programmable salinity offset (0–45 ppt) per sample batch.
- IP67-rated portable housing—fully sealed against dust ingress and immersion at 1 m for 30 minutes—validated per IEC 60529, enabling reliable operation during river surveys, effluent monitoring, and emergency spill response.
- Benchtop variant includes dedicated miniDIN stirrer interface and auto-start logic synchronized with DO acquisition—eliminates operator-induced variability in BOD incubation protocols.
Sample Compatibility & Compliance
The 320D-01 is validated for use with natural waters (rivers, lakes, estuaries), treated effluents, aquaculture systems, and activated sludge reactors. It meets the physical and metrological requirements of U.S. EPA-approved methods for DO determination in BOD5 testing (Method 405.1), as well as ISO 5815-1:2016 (biological oxygen demand) and EN 25814 (wastewater characterization). All calibration records, measurement metadata (timestamp, operator ID, location tag, atmospheric conditions), and sensor diagnostic logs are stored in immutable GLP-compliant format. When configured with optional FDA 21 CFR Part 11 software module, the system provides full audit trail, electronic signature enforcement, and role-based access control—satisfying GxP validation requirements for regulated environmental laboratories.
Software & Data Management
Data integrity is enforced through embedded GLP firmware: 200 measurement records are timestamped, annotated with sensor serial number and calibration history, and retained even after power loss. The instrument stores the last 10 calibration events—including slope, zero offset, and membrane response time—with full traceability to reference standards. Ten user-defined method templates (e.g., “Stream Survey,” “Wastewater Influent,” “BOD Incubator Check”) can be password-protected and recalled with one-button activation. Firmware and method libraries are upgradable via secure HTTPS connection using Thermo Fisher’s Orion Link desktop application. Raw data exports support CSV and XML formats compatible with LIMS integration (e.g., LabWare, STARLIMS) and statistical analysis platforms (JMP, Minitab).
Applications
- Regulatory compliance monitoring under Clean Water Act Section 305(b) and NPDES permit conditions.
- Field-based assessment of hypoxic zones in coastal and inland water bodies.
- Process control in municipal and industrial wastewater treatment plants—especially aeration basin optimization and denitrification monitoring.
- Ecological research requiring high-temporal-resolution DO profiling in benthic chambers and mesocosms.
- Educational laboratory instruction aligned with AP Environmental Science and undergraduate limnology curricula.
- Emergency response verification following chemical spills or algal bloom events.
FAQ
Does the 320D-01 require daily calibration for field use?
No—calibration stability exceeds 72 hours under typical ambient conditions. However, EPA-compliant BOD5 protocols mandate pre- and post-incubation calibration verification.
Can the polarographic electrode be used in high-solids wastewater?
Yes, provided the membrane is cleaned with soft tissue after each measurement and verified for response time (< 60 s to 95% of final value) prior to critical assays.
Is the IP67 rating maintained when the battery compartment is opened?
The IP67 seal integrity is certified only when all covers—including the battery door—are fully latched with OEM gaskets in place and undamaged.
How does the instrument handle low-oxygen environments below 0.1 mg/L?
The 0.01 mg/L resolution mode engages automatically below 1.0 mg/L, and zero-point calibration using sodium sulfite solution is supported per ASTM D888 Annex A1.
Are replacement membranes and electrolyte supplied with initial purchase?
A starter kit containing two membranes, electrolyte solution, and membrane installation tool is included with every 320D-01 portable unit (Order Code: 083005).
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