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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