Leici JPSJ-606L Dissolved Oxygen Meter
| Brand | Leici |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Product Origin | Domestic (China) |
| Model | JPSJ-606L |
| Instrument Type | Benchtop Laboratory Meter |
| Measurement Principle | Polarographic Electrochemical Probe |
| Measurement Range | 0–20.00 mg/L (or 0–200.0% saturation) |
| Accuracy | ±0.01 mg/L (at 25 °C, within 0–10 mg/L range) |
| Repeatability | ±0.2 mg/L per hour |
| Detection Limit | Not specified per manufacturer documentation |
| Calibration Options | 1-point (air-saturated water) or 2-point (zero O₂ and air-saturated) |
Overview
The Leici JPSJ-606L Dissolved Oxygen Meter is a benchtop laboratory instrument engineered for precise, stable, and traceable measurement of dissolved oxygen (DO) concentration in aqueous samples. It operates on the polarographic electrochemical principle—utilizing a Clark-type membrane-covered sensor with a gold cathode and silver/silver chloride anode immersed in an electrolyte gel. In the presence of molecular oxygen, a diffusion-controlled reduction current is generated at the cathode surface; this current is linearly proportional to the partial pressure of dissolved oxygen, enabling quantitative determination in mg/L (ppm) or % saturation. Designed for routine water quality assessment in environmental labs, wastewater treatment facilities, aquaculture research, and academic teaching laboratories, the JPSJ-606L integrates temperature compensation (via built-in NTC thermistor), atmospheric pressure input, and salinity correction to ensure metrological rigor across variable field and lab conditions.
Key Features
- Benchtop form factor with large backlit LCD display (128 × 64 pixels) supporting simultaneous readout of DO concentration (mg/L), saturation (%), temperature (°C), and atmospheric pressure (kPa or mmHg)
- Auto-temperature compensation (0–40 °C) with manual salinity adjustment (0–35 g/L) and barometric pressure input (60–110 kPa) for accurate normalization to standard conditions
- Polarographic probe interface compatible with Leici DO sensors (e.g., DO-957 series), featuring quick-connect waterproof BNC connector and automatic electrode recognition
- Two-point calibration capability: zero-oxygen (sodium sulfite solution) and air-saturation (20.9% O₂ in ambient air) with real-time calibration status feedback
- Data logging function stores up to 200 measurement records with timestamp, temperature, and DO value; export via USB interface (no proprietary software required)
- Robust housing rated IP54 for splash resistance; CE-compliant power supply (AC adapter, 100–240 V, 50/60 Hz); low-power standby mode for extended operational uptime
Sample Compatibility & Compliance
The JPSJ-606L is validated for use with freshwater, seawater, wastewater effluents, biological media, and process streams where oxygen solubility ranges from 0 to 20 mg/L. It complies with general requirements outlined in ISO 5814:2012 (Water quality — Determination of dissolved oxygen — Electrochemical probe method) and supports adherence to EPA Method 360.1 (Dissolved Oxygen in Water) when used with proper calibration protocols and certified reference materials. While not individually certified under FDA 21 CFR Part 11, its data integrity features—including time-stamped records, non-editable log storage, and calibration history tracking—facilitate GLP-aligned documentation practices in regulated environmental testing environments.
Software & Data Management
The meter operates autonomously without host software dependency. All configuration, calibration, and measurement functions are accessible via intuitive front-panel navigation keys. Stored data can be retrieved directly on-screen or exported as plain-text CSV files via USB mass-storage mode—compatible with Excel, LabChart, or LIMS platforms without driver installation. No cloud connectivity or remote firmware updates are supported, preserving data sovereignty and minimizing cybersecurity exposure in institutional networks. Audit trail elements include date/time stamp, calibration type (1-pt or 2-pt), sensor ID (if entered manually), and operator notes (optional 16-character field).
Applications
- Regulatory compliance monitoring of municipal and industrial wastewater discharge per national environmental standards (e.g., China’s HJ 506-2009, US EPA NPDES)
- Biological oxygen demand (BOD₅) incubation endpoint verification in standard dilution methods
- Aquaculture system optimization—real-time DO profiling in recirculating aquaculture systems (RAS) and hatchery tanks
- Environmental impact assessments (EIA) requiring baseline and post-intervention DO mapping in rivers, lakes, and estuaries
- Academic instruction in analytical chemistry and environmental engineering laboratories for method validation exercises
- Quality control of pharmaceutical water systems (PW, WFI) where DO monitoring supports oxidative stability studies
FAQ
Does the JPSJ-606L support automatic pressure compensation during field measurements?
Yes—the user enters local barometric pressure manually before measurement; the instrument applies real-time correction using the Benson-Krause solubility model.
Is sensor membrane replacement supported in-house by the end user?
Yes—Leici DO probes (e.g., DO-957-01) feature field-replaceable membranes and electrolyte fill kits, with step-by-step instructions provided in the operation manual.
Can the meter store calibration history separately for multiple probes?
No—it retains only the most recent calibration parameters; users must manually record probe-specific calibration logs for traceability.
What is the recommended recalibration frequency for routine lab use?
Daily verification against air-saturated water is advised; full two-point calibration every 24–48 hours or after probe maintenance.
Is the USB interface compatible with macOS and Linux systems?
Yes—USB mass-storage mode requires no drivers and functions identically across Windows, macOS, and Linux distributions.
