Posted on 3/31/2023
Electrochemical O2 sensors are the best choice for scuba diving due to their excellent stability at elevated O2 levels, accuracy, relatively small size, and lower cost.
In electrochemical O2 sensors, oxygen is reduced at the cathode with simultaneous oxidation of anode (typically lead, Pb), the flow of current between anode and cathode is proportional to the partial pressure of O2 in a gas stream. Sensors are calibrated against a known standard before diving. Theoretically, these sensors should continue to function without losing signal...