Eutech DO2700 Dissolved Oxygen and BOD Meter

Overview

The Eutech DO2700 is a benchtop dissolved oxygen (DO) and biochemical oxygen demand (BOD) meter engineered for precision, repeatability, and regulatory compliance in environmental and water quality laboratories. It employs a galvanic cell-type electrochemical probe — a self-powered, zero-maintenance sensor technology that delivers stable output without external polarization voltage. This principle enables rapid response, minimal drift, and long-term stability under routine laboratory conditions. Designed to meet the operational demands of standard methods such as ASTM D888, ISO 5814, and APHA 4500-O, the DO2700 supports critical applications including wastewater treatment monitoring, drinking water compliance testing, aquaculture management, and environmental impact assessment. Its integrated temperature, salinity, and barometric pressure compensation algorithms ensure traceable, field-relevant DO values across diverse sample matrices — from freshwater streams to brackish estuaries and aerated bioreactors.

Key Features

• Galvanic DO probe with built-in stirring mechanism for consistent diffusion-layer control and reduced measurement lag
• Dual-point automatic saturation calibration (0% and 100% O₂) with real-time validation feedback
• Simultaneous DO, % saturation, and temperature readouts on a high-contrast backlit LCD (5.9 × 7.8 cm)
• Full parametric compensation: automatic temperature (0.0–50.0 °C), salinity (0–50 ppt), and barometric pressure (450–825 mmHg)
• GLP-compliant data management: 500 timestamped records stored onboard with operator ID, calibration history, and environmental metadata
• Bidirectional RS232 interface supporting direct connection to PCs or LIMS; compatible with Eutech’s PC Connect software for audit-trail generation
• User-configurable security: password-protected menu access and calibration settings to prevent unauthorized modification
• Programmable alarms for out-of-range DO, temperature, or calibration expiry — configurable per test protocol
• Auto-store mode for time-series BOD incubation tracking with interval logging (e.g., 0, 24, 48, 72 h)

Sample Compatibility & Compliance

The DO2700 is validated for aqueous samples within pH 4–9 and conductivity < 20 mS/cm. It accommodates standard 12-mm OD galvanic probes (e.g., ECDOPTX12) and supports both static and stirred measurements per Standard Methods 4500-O B. Its compensation algorithms align with ISO 5814:2012 (electrochemical determination of dissolved oxygen) and EPA Method 360.1 (DO by membrane electrode). The instrument’s firmware and data handling architecture support 21 CFR Part 11 readiness when used with validated software and procedural controls — including electronic signature prompts, immutable audit logs, and user-level access tiers. All stored data include ISO 8601 timestamps, probe serial numbers, and calibration certificate references, satisfying GLP and ISO/IEC 17025 documentation requirements.

Software & Data Management

Data export is performed via RS232 using ASCII-delimited text files (.csv or .txt), preserving all metadata fields: date/time stamp, DO (mg/L), % saturation, temperature (°C), salinity (ppt), pressure (mmHg), probe ID, and calibration status. Optional Eutech PC Connect software provides visualization tools, trend analysis, and report generation compliant with laboratory QA/QC workflows. Each exported record includes a unique session ID and checksum for data integrity verification. Internal memory retains calibration history (up to 10 sessions), sensor diagnostics (e.g., membrane integrity flag), and battery/adapter status — all accessible via the instrument’s service menu. No cloud connectivity or proprietary drivers are required; native Windows/Linux terminal emulation is fully supported.

Applications

• Regulatory BOD₅ testing per APHA 4500-O and ISO 5815-1 in municipal and industrial wastewater labs
• Drinking water distribution system monitoring for residual oxygen stability and corrosion potential assessment
• Aquaculture facility DO profiling across diurnal cycles and feeding events
• Research-scale bioreactor DO control validation and mass-transfer coefficient (k_La) estimation
• Educational laboratory instruction in environmental chemistry and limnology
• Field-deployable lab verification — portable yet benchtop-rugged design meets IP20 enclosure rating for controlled indoor environments

FAQ

What calibration standards are required for daily operation?
A saturated air standard (100% O₂ at ambient temperature/pressure) and sodium sulfite solution (0% O₂) are recommended for two-point calibration. Calibration frequency follows internal SOPs but must occur before each analytical batch per ISO/IEC 17025.
Does the DO2700 support dissolved oxygen measurement in seawater?
Yes — with salinity compensation enabled (0–50 ppt range) and appropriate probe membrane selection. Users must input local salinity or integrate with a calibrated conductivity meter for automated correction.
Can historical data be audited for regulatory submissions?
Yes — all 500 stored records include immutable timestamps, operator IDs, and calibration traceability. When paired with PC Connect and procedural controls, the system supports FDA and EU Annex 11 audit requirements.
Is probe replacement user-serviceable?
Yes — the galvanic probe uses standardized 12-mm threading and requires no potentiostat alignment. Replacement membranes and electrolyte are available as OEM kits (ECDO-MEMKIT, ECDO-ELECTROLYTE).
What is the warm-up time prior to first measurement?
Less than 60 seconds after power-on; stabilization time post-calibration is typically 2–3 minutes for reproducible sub-0.05 mg/L precision.