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Sensorex Dissolved Oxygen Lab Sensors

Dissolved Oxygen (DO) is the amount of oxygen dissolved in a unit of water. Oxygen gets into water by: diffusing within the surrounding air, aeration (turbulent movement), and as a waste product from plants through photosynthesis.

Galvanic Dissolved Oxygen Sensors

Galvanic DO sensors consist of two electrodes: an anode and cathode. Both of these electrodes are immersed in electrolytes (inside the sensor body). An oxygen permeable membrane separates the anode and cathode from the measured water.

The permeable membrane allows oxygen from the sample water to diffuse into the sensor, where it is reduced at the cathode. This chemical reaction produces an electrical signal, which travels from the cathode to the anode and then into the dissolved oxygen measuring instrument. Consumption of oxygen at the cathode creates a pressure difference across the membrane that varies based on the partial pressure of oxygen in the sample. Therefore, as oxygen concentration increases, partial pressure and the rate of diffusion also increase, and the current to the instrument increases proportionally.


Galvanic Dissolved Oxygen Sensor

Our DO1200 galvanic dissolved oxygen sensors measure the oxygen content of water using an electrochemical measurement principle. Built in an economical but durable 12mm epoxy body, these sensors are suitable for portable or benchtop use. The DO1200 can also be installed inline for continuous monitoring applications by upgrading to a PTFE membrane cap. The sensor is compatible with our FC75P 3/4 inch in-line fitting for mounting into 3/4 inch FNPT threaded tees.

  • Galvanic (electrochemical) measurement principle
  • Replaceable membrane cap and fill solution
  • 12mm durable epoxy body
  • For benchtop, portable, or inline use