Leichi JPSJ-606L Dissolved Oxygen Meter

Overview

The Leichi JPSJ-606L Dissolved Oxygen Meter is a high-precision benchtop laboratory instrument engineered for accurate, reproducible measurement of dissolved oxygen (DO) concentration, saturation percentage, and temperature in aqueous samples. It employs a Clark-type polarographic sensor principle—utilizing a gold cathode and silver/silver chloride anode separated by an oxygen-permeable membrane and electrolyte solution—to generate a diffusion-limited current proportional to the partial pressure of dissolved molecular oxygen. This electrochemical transduction method ensures stable baseline response, low drift, and compatibility with a broad range of water matrices including freshwater, seawater, wastewater, and process streams. Designed for routine QC/QA, environmental monitoring, and academic research laboratories, the JPSJ-606L integrates automatic temperature and atmospheric pressure compensation algorithms, enabling traceable, matrix-corrected DO reporting per ISO 5814:2012 and ASTM D888–22 standards.

Key Features

• Intelligent endpoint detection with multiple read modes: auto-read, timed-read, interval-read, and manual-read—optimized for operator flexibility and protocol compliance.
• Integrated dual-point calibration workflow: automated zero-oxygen (sodium sulfite) and full-scale (air-saturated or water-saturated air) calibration with on-screen prompts and pass/fail validation.
• Comprehensive environmental compensation: real-time temperature (−5.0 to 130.0 °C), barometric pressure (60.0–110.0 kPa), and salinity (0.0–50.0 g/L) correction applied to all DO calculations per Winkler-derived algorithmic conventions.
• GLP-compliant data architecture: unique user login, electrode ID tracking, calibration history logging, and timestamped audit trails—including date/time stamp, operator ID, calibration parameters, and measurement metadata.
• Benchtop expandability: RS-232 and USB ports support connection to external PC workstations, automated sample changers, and USB mass storage devices for secure data export without proprietary software dependency.

Sample Compatibility & Compliance

The JPSJ-606L accommodates standard 12-mm polarographic DO probes (e.g., Leichi DO-958-B) and supports both static and flow-through measurement configurations. Its robust electronics tolerate conductivity ranges up to 200 mS/cm and pH values from 0 to 14, making it suitable for raw wastewater, estuarine brackish water, and sterilized bioreactor media. The instrument conforms to IEC 61000-6-2 (EMC immunity) and IEC 61010-1 (safety for laboratory equipment). Data integrity meets FDA 21 CFR Part 11 requirements when used with validated PC software and electronic signature protocols. Calibration records and measurement logs satisfy ISO/IEC 17025 documentation mandates for accredited environmental testing laboratories.

Software & Data Management

The embedded firmware supports storage of up to 1,000 complete measurement records—including DO (mg/L and % sat), temperature (°C), pressure (kPa), salinity (g/L), electrode status, and calibration coefficients. All entries are time-stamped and user-attributed. Data export is supported via USB flash drive in CSV format for direct import into LIMS, Excel, or statistical analysis platforms. Optional Leichi LabLink PC software enables remote configuration, method template deployment, batch report generation (PDF/Excel), and trend visualization across multi-day monitoring campaigns. Audit trail files include cryptographic hash verification to prevent post-acquisition modification.

Applications

• Environmental field labs: BOD incubation monitoring, river/lake eutrophication assessment, and regulatory compliance reporting per EPA Method 360.1 and ISO 5815-1.
• Wastewater treatment plants: Aeration basin optimization, activated sludge respiration rate analysis, and effluent discharge verification.
• Pharmaceutical water systems: Purified Water (PW) and Water for Injection (WFI) monitoring per USP and EU GMP Annex 1 requirements.
• Academic research: Microbial oxygen uptake kinetics, sediment–water interface flux studies, and aquatic toxicology assays.
• Food & beverage QC: Brew house dissolved oxygen profiling, cold fill line validation, and shelf-life modeling.

FAQ

What type of DO probe is compatible with the JPSJ-606L?

The meter is designed for use with standard 12-mm diameter polarographic DO sensors featuring Teflon or polyethylene membranes and KCl-based electrolyte—specifically Leichi DO-958-B and equivalent third-party probes meeting DIN 38404-5 electrical interface specifications.
Does the JPSJ-606L support automatic calibration verification?

Yes—it provides real-time electrode health diagnostics during calibration, including membrane integrity check, electrolyte level warning, and cathode polarization stability assessment. Failed calibrations trigger contextual error codes and recommended corrective actions.
Can measurement data be exported in a format compliant with LIMS integration?

Yes—CSV export includes column headers aligned with ASTM E1467 and ISO/IEC 17025 metadata fields (e.g., “Sample_ID”, “Operator”, “Calibration_Date”, “DO_mg_L”, “Temp_C”, “Pressure_kPa”, “Salinity_g_L”, “Timestamp_ISO8601”).
Is the instrument suitable for continuous unattended operation?

While primarily designed for discrete sample analysis, the JPSJ-606L supports timed-interval reading mode and can be integrated with programmable autosamplers for overnight batch processing under controlled ambient conditions (15–30 °C, non-condensing humidity).
How does the JPSJ-606L handle low-oxygen or anaerobic measurements?

The polarographic sensor achieves sub-0.1 mg/L resolution with built-in zero-oxygen calibration; combined with ±0.10 mg/L electronic accuracy and thermal drift compensation, it reliably quantifies hypoxic conditions down to 0.01 mg/L in deoxygenated calibration standards or nitrogen-purged samples.