• Dissolved Oxygen Sensor

  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.

  Why is Dissolved Oxygen Measurement is necessary?

  For aquaculture, if DO level falls too low then fish will suffocate as a consequence. In a sewage treatment plant, bacteria will decompose the solids. If the DO level is too low, then bacteria will die and the composition will cease: if DO level is too high then energy will be wasted through the aeration of the water. In industrial applications, including boilers, the make up water must have low DO levels in order to avoid corrosion and boiler scale build up. Monitoring dissolved oxygen content is essential for ensuring process efficiency, because boiler scale build up inhibits heat transfer. A high DO level in water improves the taste of drinking water. However, high DO levels will increase corrosion n water plumbing and transport lines.

DO Sensor

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