Operating Principle and Construction of Zirconium Dioxide Oxygen Sensors

Sensortechnics' oxygen sensors of the XYA series consist of two zirconium dioxide (ZrO2) discs coated with thin porous layers of platinum, which serve as electrodes. The two discs are attached to a platinum ring, forming a hermetically sealed chamber. At the outer surfaces of the ZrO2 discs there are two further platinum rings to provide for the sensors electrical contacts. The first disc is connected to a reversible current source, at the second disc a voltage (Nernst voltage) can be measured.

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