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The Oxygen analyzer employs a ceramic zirconium oxide reaction
cell, which develops a voltage between surfaces exposed to
different concentrations of oxygen. Ambient air is routed to the
interior of the cell, with the sample stream routed to the
exterior of the cell. When the sample stream oxygen content is
20.9%, the concentration normally found in air, the cell output
voltage is zero. As the oxygen content in the sample stream
drops, the zirconium oxide cell will sense the difference in
oxygen concentration between the sample and the ambient air, and
generate a voltage that can be made proportional to the oxygen
content of the sample stream.

[Summary provided by Rutgers University]