Project Description

Online Dissolved Oxygen Sensor

WODO series aquaculture special fluorescence dissolved oxygen sensor, specially tailored for aquaculture market, using our self-developed fluorescent materials. No oxygen consumption, no flow rate limitation, no electrolyte required, no maintenance and calibration, strong anti-interference ability, excellent stability. Built-in temperature sensor, automatic temperature compensation. RS485 output, can be networked without a controller.

Optical Dissolved Oxygen Sensor Feature

  • Digital sensor, RS485 output, support MODBUS

  • No membrane, no electrolyte, no interference, no frequent calibration

  • No oxygen consumption, no flow restriction

  • Specially tailored for aquaculture market, with super high cost performance.

Principle of Operation

Fluorescence dissolved oxygen sensor is based on the quenching principle of active fluorescence by specific substances in physics. Blue light from a light emitting diode (LED) illuminates the fluorescent material on the inner surface of the cap, fluorescent substances on the inner surface are stimulated, glowing red light, by detecting the phase difference between red and blue light and comparing with the internal calibration value, the concentration of oxygen molecule can be calculated, and the final value can be automatically compensated by temperature and pressure.


  • Avoid exposing the inner surface of the fluorescent cap to sunlight.
  • Please do not touch the fluorescent membrane with your hand.
  • Avoid applying any mechanical stress (pressure, scratches, etc.) directly to the fluorescent membrane during use.

Technical Parameters

Name Technical Specification
Model W505-A
Measuring Principle Fluorescence Method
Measuring Range 0~20mg/L or 0~200% saturation
Accuracy 3%
Response Time 40 S
Sensor Drift <3% per year
Temperature Sensor NTC
Temperature Range 0 ~ 50℃
Temperature Accuracy ±0.5℃
Protection Grade IP68
Maximum Operating Pressure 6 bar
Sensor Interface Support RS-485, MODBUS protocol
Assembly M22*1.5mm
Power Information DC 6~12V, current <50mA
Sensor Dimension Φ23*188.3
Sensor Cable Length 10 meters (default), can be customized
Calibration One point or two points calibration
Fluorescent Cap Life Guaranteed to use for one year (under normal use)
Shell Material 316L Stainless Steel

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