CLEAN DO500 Benchtop Dissolved Oxygen Meter
| Brand | CLEAN |
|---|---|
| Origin | USA |
| Model | DO500 |
| Instrument Type | Laboratory Benchtop |
| Measurement Principle | Galvanic Cell Electrochemical Probe |
| Measurement Range (DO) | 0.00–40.00 mg/L |
| Accuracy | ±0.2% F.S. |
| Repeatability | 0.1% |
| Detection Limit | 0 mg/L |
| Saturation Range | 0.0–400.0% |
| Temperature Compensation Range | 0.0–50.0 °C |
| Temp. Accuracy | ±0.2 °C |
| Atmospheric Pressure Setting | 600–1400 mbar (1 mbar resolution) |
| Salinity Compensation | 0.0–40.0 g/L (0.1 g/L resolution) |
| Data Storage | 50 sets |
| Dimensions | 140 × 210 × 35 mm (W × L × H) |
| Weight | 650 g |
| Operating Environment | –5 to 60 °C, <90% RH |
Overview
The CLEAN DO500 Benchtop Dissolved Oxygen Meter is a precision-engineered electrochemical instrument designed for reliable, repeatable measurement of dissolved oxygen (DO) concentration in aqueous samples using a self-polarizing galvanic cell probe. Unlike polarographic sensors requiring external polarization voltage and warm-up time, the DO500’s galvanic electrode generates its own current proportional to oxygen partial pressure—enabling immediate, stable readings without pre-conditioning. The instrument implements temperature-compensated amperometric detection, with integrated NTC thermistor for real-time thermal correction across 0.0–50.0 °C. Its dual-unit display (mg/L and % saturation) supports both regulatory reporting and process monitoring requirements in environmental, municipal, and academic laboratories. Engineered for long-term stability and minimal maintenance, the DO500 complies with fundamental performance expectations outlined in ASTM D888 (Standard Test Methods for Dissolved Oxygen in Water) and aligns with EPA Method 360.1 for field- and lab-based DO analysis.
Key Features
- Galvanic cell probe technology—zero polarization time, no warm-up delay, and inherent signal stability over extended operation
- Dual-parameter display: simultaneous readout of dissolved oxygen in mg/L and % saturation, with user-selectable units
- Comprehensive environmental compensation: automatic temperature correction (0.0–50.0 °C), manual barometric pressure adjustment (600–1400 mbar), and salinity compensation (0.0–40.0 g/L)
- High-contrast backlit LCD with intuitive menu navigation; all calibration and diagnostic parameters—including zero offset, slope, and electrode response time—accessible via single-button recall
- Robust benchtop architecture: compact footprint (140 × 210 × 35 mm), lightweight aluminum housing (650 g), and operating range suitable for ambient lab or controlled classroom environments (–5 to 60 °C, <90% RH non-condensing)
- Onboard data management: 50-point non-volatile memory with timestamp-free storage; export-ready via optional RS232 interface (cable sold separately)
- Modular electrode mounting system: detachable 90° bracket compatible with left- or right-side installation, enabling multi-probe configurations for parallel DO/pH/conductivity measurements
Sample Compatibility & Compliance
The DO500 is validated for use with freshwater, seawater, wastewater effluents, aquaculture systems, and surface water matrices. Its galvanic sensor demonstrates low flow-dependence and reduced susceptibility to membrane fouling compared to Clark-type electrodes—making it particularly suitable for low-turbidity or biologically active samples. Calibration follows standard two-point methodology (zero-oxygen and air-saturation), traceable to NIST-certified standards. While not certified for GLP/GMP-regulated production environments, the instrument meets technical prerequisites for routine QC testing under ISO/IEC 17025-accredited laboratories when operated per manufacturer-specified procedures. Its design supports adherence to US EPA guidance for DO monitoring in NPDES compliance reporting and state-level water quality assessment programs.
Software & Data Management
The DO500 operates as a standalone analytical endpoint with no proprietary software dependency. All configuration, calibration, and data review occur directly on-device via tactile membrane keys and responsive LCD feedback. Stored measurements (50 entries) retain full parameter context—including date/time stamp (when synchronized externally), temperature, pressure setting, and salinity value—but do not embed audit trail metadata. For integration into LIMS or centralized QA workflows, raw serial output (ASCII format, 9600 baud) is compatible with generic terminal emulators or custom Python/Excel parsers. Firmware updates are not field-upgradable; device revision control is maintained through hardware version labeling (e.g., DO500 v2.1).
Applications
- Environmental monitoring: routine DO profiling of rivers, lakes, reservoirs, and wetlands per state water quality standards
- Wastewater treatment: aeration basin optimization, activated sludge process control, and effluent compliance verification
- Aquaculture and fisheries: dissolved oxygen management in hatcheries, recirculating aquaculture systems (RAS), and pond-based operations
- Academic instruction: undergraduate chemistry and environmental science labs requiring hands-on electrochemical sensor training
- Industrial pretreatment: influent characterization prior to biological treatment stages or membrane filtration units
FAQ
Does the DO500 require electrode polarization before use?
No—the galvanic cell probe is self-polarizing and delivers stable readings immediately upon immersion.
Can the instrument compensate for high-salinity samples such as seawater?
Yes; manual salinity input (0.0–40.0 g/L) adjusts the oxygen solubility model in real time, improving accuracy in marine or brackish applications.
Is the DO500 compliant with FDA 21 CFR Part 11 for electronic records?
No; it lacks user authentication, electronic signatures, and immutable audit trails required for regulated pharmaceutical or clinical use.
What is the recommended calibration frequency for routine laboratory use?
Daily two-point calibration is advised for critical applications; weekly verification suffices for educational or screening-level analysis.
Are replacement membranes and electrolyte supplied with the instrument?
A complete sensor maintenance kit—including spare membranes, cathode caps, and electrolyte solution—is available as CLEAN part #DO500-MK, sold separately.
