ChemTron DO80 Portable Dissolved Oxygen Analyzer

Overview

The ChemTron DO80 Portable Dissolved Oxygen Analyzer is a field-deployable electrochemical instrument engineered for precise, real-time measurement of dissolved oxygen (DO) concentration in aqueous media using the Clark-type polarographic sensor principle. It operates on the amperometric detection method, where oxygen diffuses through a gas-permeable membrane and is reduced at a cathode surface, generating a current proportional to the partial pressure of O₂. The analyzer integrates automatic temperature compensation (0–50 °C), salinity correction (0–50.0 ppt), and barometric pressure adjustment (500–1499 mmHg) to ensure accurate DO quantification across diverse environmental and process conditions—including freshwater, seawater, wastewater, fermentation broths, and pharmaceutical water systems. Its compact form factor (195 × 40 × 36 mm), lightweight construction (150 g), and dual-unit display (ppm and % saturation) make it suitable for routine QC checks, regulatory compliance sampling, and field-based environmental monitoring where portability and traceable calibration are essential.

Key Features

• Simultaneous dual-parameter display: dissolved oxygen (0.00–19.99 ppm / 0.0–199.9 % saturation) and temperature (0–50 °C) on a backlit LCD screen
• One-button calibration protocol compatible with zero-oxygen and air-saturated standards, supporting both manual and automated slope verification
• Configurable compensation parameters: user-adjustable salinity (0–50.0 ppt) and atmospheric pressure (500–1499 mmHg) to correct for site-specific hydrostatic and compositional effects
• Internal data logger with timestamped storage for up to 99 measurement records, including date, time, DO value, temperature, and unit mode
• RS232 serial interface enabling direct connection to PCs for real-time data streaming and post-acquisition analysis via included software
• Robust power architecture: powered by four standard AAA alkaline cells (typical runtime: 120 hours) or optional external DC 9 V adapter for extended benchtop operation
• IP67-rated probe cable assembly (PD3030-3, 3 m standard; PD3030-5, 5 m optional) with integrated temperature sensor and replaceable Clark-type membrane cap (5 membranes per box, 2 boxes supplied)

Sample Compatibility & Compliance

The DO80 is validated for use with liquid-phase samples exhibiting conductivity ≥50 µS/cm and non-aggressive chemical composition (pH 4–9, no strong oxidizers or sulfides). It complies with ASTM D888–22 (Standard Test Methods for Dissolved Oxygen in Water) for field and laboratory applications. While not certified for intrinsically safe or hazardous area deployment, its design meets general-purpose industrial hygiene and environmental monitoring requirements under ISO 5814:2012 (Water quality — Determination of dissolved oxygen — Electrochemical probe method). The instrument supports GLP-aligned workflows through timestamped data logging and exportable CSV files, facilitating audit readiness in regulated environments such as drinking water utilities (EPA Method 360.1), biopharmaceutical process water testing (USP ), and wastewater treatment plant reporting (EU Directive 91/271/EEC).

Software & Data Management

The DO80 includes Windows-compatible communication software that enables bidirectional data exchange via RS232. Users can initiate live data capture, retrieve stored measurements with full metadata (date/time stamp, DO value, temperature, unit mode), and export datasets in comma-separated values (.csv) format for integration into LIMS or statistical analysis platforms (e.g., JMP, Minitab). The software supports configurable logging intervals, alarm thresholds (programmable high/low DO limits), and batch export—critical for trend analysis in multi-point surveys or longitudinal process validation studies. All firmware updates and calibration logs are retained locally within the device memory and remain accessible during data download sessions, ensuring continuity of measurement history without dependency on cloud infrastructure.

Applications

• Environmental field monitoring: river, lake, and estuary DO profiling for ecological assessment and TMDL compliance
• Wastewater treatment: aeration basin optimization, activated sludge respiration rate evaluation, and effluent discharge verification
• Drinking water distribution: residual oxygen mapping in storage tanks and pipeline networks to assess corrosion potential
• Biotechnology and fermentation: real-time DO tracking during upstream processing of monoclonal antibodies, vaccines, and recombinant proteins
• Aquaculture management: pond and recirculating aquaculture system (RAS) monitoring to prevent hypoxic stress in finfish and shellfish
• Pharmaceutical water systems: periodic verification of purified water (PW) and water for injection (WFI) DO levels per USP guidance

FAQ

What calibration standards are required for the DO80?
The DO80 requires two-point calibration: a zero-oxygen solution (e.g., sodium sulfite saturated solution) and an air-saturated water standard (prepared at known temperature, salinity, and barometric pressure).
Can the DO80 measure dissolved oxygen in seawater?
Yes—provided salinity is manually entered (0–50.0 ppt) and pressure compensation is applied; accuracy remains within ±1.5% FS when used per ASTM D888–22 protocols.
Is the PD3030 probe compatible with other ChemTron meters?
The PD3030 series probe uses a standardized BNC + thermistor interface and is interoperable with all ChemTron portable DO analyzers featuring matching analog input circuitry (e.g., DO70, DO90).
Does the DO80 support FDA 21 CFR Part 11 compliance?
While the device itself does not provide electronic signatures or audit-trail encryption, its timestamped data export functionality enables alignment with Part 11 requirements when integrated into validated laboratory information management systems (LIMS) with appropriate procedural controls.
How often should the membrane and electrolyte be replaced?
Under typical use (daily field measurements), replace the membrane cap and refill electrolyte every 4–6 weeks; more frequent replacement is recommended in high-sulfide or particulate-laden samples.