• Dissolved and atmospheric oxygen measurements;
  • Measure in water or soils to depths of 5 metres;
  • Simple set up and easy to install;
  • Low ongoing maintenance and long-life sensor;
  • Ideal for aquaculture, scientific research and internet enabled devices.


The Implexx Oxygen Sensor (model MIJ-03) is a dissolved and atmospheric oxygen sensor designed for long-term, in-situ monitoring.

The Implexx Oxygen Sensor sensor can be installed in water to a depth of 5 metres or 16 feet. It is ideal for monitoring dissolved oxygen in tanks, ponds, rivers, estuaries, and shallow marine water.

The Implexx Oxygen Sensor sensor can also be buried in soil or sediment to any depth. 

Each sensor is individually calibrated for maximum accuracy. Calibration is extremely easy and can be completed in ambient air.

Maintenance of the Implexx Oxygen Sensor is minimal. Once the sensor is installed in the soil, there is no further maintenance. The life-time of the sensor is approximately 10 years when the electrochemical element of the sensor expires.

The Implexx Oxygen Sensor has a voltage output that can be supported by any compatible data logging system. 

The Implexx Oxygen Sensor is built from a polyoxymethylene (POM), a rigid thermoplastic, that provides long-term stability in harsh environmental conditions. The sensing apparatus is behind a Teflon hydrophobic, gas porous membrane, meaning the Implexx Oxygen Sensor can measure under saturated, flooded and anaerobic conditions. 


  • Aquaculture monitoring and management;
  • Marine, oceanography and biogeochemistry scientific research;
  • Soil science and plant (root) physiology;
  • Agriculture and horticulture soil health monitoring.


Measurement Principle

The Implexx Oxygen Sensor is an electrochemical, or galvanic, style sensor. Similar to the operation of a battery, an electrochemical difference is created which is proportion to oxygen concentration. Oxygen molecules diffuse through the Teflon membrane, via gradients of diffusion, and interact with the electrolyte in the sensor’s cell. An electrical charge is created between the anode and cathode of the cell. The greater the oxygen concentration, then the greater the electrical charge. The relationship between the oxygen concentration and the electrical charge is linear. A two-point calibration curve: ambient air (20.9 %) and 0 % oxygen. Fortunately, the Implexx Oxygen Sensor is extremely easy to calibrate: ambient air can be easily measured; and the 0 % value is simply 0 mV in the sensor. Therefore, the the Implexx Oxygen Sensor can be calibrated in ambient air.




Feature Specification
Measurement Range 0 to 20.9 %
Accuracy ±0.1 %
Resolution 0.01 %
Dimensions Weight: 220 g; Height: 40 mm; Length: 78 mm
Output Voltage only; 45 - 65mV at 20.9 % O2
Power Input Non-polarised; no power required
Cable Length 5m standard; others on request
Materials Teflon membrane; Polyoxymethylene body
Environmental Tolerance Temperature: -20 to +60 °C; Depth Rating: 5m (~0.5 Bar)
Sensor Life Expectancy 5 to 10 years
Warranty 1 year

Manual & Docs

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