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Fluorescence Dissolved Oxygen Sensor
Fluorescence Dissolved Oxygen Sensor Fluorescence Dissolved Oxygen Sensor

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Fluorescence Dissolved Oxygen Sensor

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The BGT-WDO(K2) fluorescence dissolved oxygen sensor is designed based on the principle of quenching fluorescence by specific substances in physics. When excitation light strikes the fluorescent material on the surface of the fluorescent membrane, it is excited and emits fluorescence. The quenching time of this fluorescence is affected by the concentration of oxygen molecules on the membrane surface. By measuring the phase difference between the fluorescence and the excitation light and comparing it with an internal calibration curve, the oxygen concentration is calculated and the final value is compensated for temperature and salinity.
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◀◀  Key Selling Points  ▶▶


Dissolved oxygen (DO) sensors are critical for measuring the amount of oxygen available in water, which is essential for aquatic life, industrial processes, and environmental protection. Below are the key application scenarios for DO sensors:

*Without electrolyte, the polarization will not 

*Without consuming oxygen, without affecting the flow rate 

*Built-in temperature sensor, automatic temperature compensation 

*Interference is not sulfide and other chemicals 

*Drift is small, fast response, more accurate measurement 

*Maintenance-free, long life cycle, the use of lower cost 

*Fluorescent cap replacement is simple 

*RS-485 interface, Modbus-RTU protocol




◀◀  Product Parameters  ▶▶


Parameter Category Specifications
Model BGT-WDO(K2)
Housing Material - POM, ABS/PC Alloy
- TC4 Titanium Alloy
- 316L Stainless Steel
Measurement Principle Fluorescence Method
Measuring Range & Resolution - 0~20.00 mg/L (0~200% Saturation, 25℃); Resolution: 0.01mg/L, 0.1℃
- 0~50.00 mg/L (0~500% Saturation, 25℃); Resolution: 0.01mg/L, 0.1℃
Accuracy ±2% (for dissolved oxygen), ±0.3℃ (for temperature)
Response Time (T90) <30s
Minimum Detection Limit 0.08mg/L
Calibration Method Two-Point Calibration
Cleaning Method /
Temperature Compensation Automatic Temperature Compensation (Pt1000 Sensor)
Output Mode RS-485 (Modbus RTU), 4-20 mA (Optional)
Storage Temperature -5~65℃
Operating Conditions Temperature: 0~50℃; Pressure: ≤0.2MPa
Installation Method Submersible Installation, 3/4 NPT
Power Consumption 0.2W @ 12V DC
Power Supply 12~24V DC
Protection Level IP68
Fluorescent Membrane Life 1 Year (Under Normal Operating Conditions)
Cable Length 5 Meters; Other Lengths Available on Customization



◀◀  Application Scenarios  ▶▶


1. Environmental & Ecological Monitoring

  • Rivers, Lakes, and Oceans

  • Assess water health and detect hypoxia (low oxygen) in ecosystems.

  • Monitor eutrophication (algal blooms) caused by excess nutrients.

  • Wetlands & Estuaries

  • Study oxygen fluctuations due to tides and organic decomposition.

2. Wastewater Treatment & Industrial Effluent

  • Activated Sludge Processes

  • Optimize aeration in biological treatment to reduce energy costs.

  • Effluent Compliance

  • Ensure discharged water meets regulatory DO levels (e.g., >2 mg/L for fish survival).

  • Anaerobic Digestion

  • Monitor oxygen-free conditions for biogas production.

3. Aquaculture & Fish Farming

  • Ponds, Tanks, and Recirculating Systems (RAS)

  • Maintain safe DO levels (typically 5–6 mg/L for most fish).

  • Prevent fish kills due to oxygen depletion (e.g., at dawn).

  • Transport of Live Seafood

  • Ensure sufficient oxygen during shipping.

4. Drinking Water & Distribution Systems

  • Reservoirs & Pipelines

  • Detect oxygen levels to prevent corrosion (low DO) or taste issues (high DO).

  • Groundwater Monitoring

  • Track DO to assess contamination risks (e.g., methane intrusion).

5. Industrial Processes

  • Biotech & Fermentation

  • Control oxygen for microbial growth (e.g., in breweries, pharmaceuticals).

  • Power Plant Cooling Water

  • Prevent corrosion in boilers and condensers.

  • Pulp & Paper Industry

  • Monitor oxygen in effluent to comply with environmental regulations.

6. Research & Education

  • Oceanography & Limnology

  • Study seasonal DO variations in deep waters ("dead zones").

  • Laboratory Experiments

  • Test BOD (Biochemical Oxygen Demand) for pollution studies.



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