| Operation of amperometric oxygen sensors is based on an electrochemical zirconium dioxide pump cell. If voltage is applied to the cell, oxygen ions are pumped from the cathode to the anode. Covering of the cathode with a gas diffusion barrier creates saturation voltage, which measures oxygen concentration in the environment. Since the property of oxygen ion conductivity does not occur below approx. 400°C, the sensor has to be heated accordingly. Due its operating mode, the sensor does not require reference gas. |
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