Employ two ZrO₂ discs with a small, hermetically sealed chamber between the discs. The first disc functions as a reversible oxygen pump, which successively fills and empties the chamber. The second disc measures the ratio of the partial pressure difference and generates a corresponding voltage. A heat element produces the 700 °C required for the ZrO₂ to operate as an O₂ pump. The time needed for the pump to achieve specific minimum and maximum pressures within this chamber provides a measure of the partial oxygen pressure of the environment.

Best Used For:
Industrial process and aircraft on-board oxygen generation system control, automotive exhaust gas diagnostics, service instruments, environmental oxygen monitoring, agriculture, combustion systems and environmental control.