The Vernier O2 Gas Sensor measures the oxygen concentration in the range of 0 to
27% using an electrochemical cell. The cell contains a lead anode and a gold
cathode immersed in an electrolyte. Oxygen molecules entering the cell are
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electrochemically reduced at the gold cathode. This electrochemical reaction
generates a current that is proportional to the oxygen concentration between the
electrodes. The sensor output is a conditioned voltage proportional to the reaction
current.