This study displays the results obtained with a planar, impedance-metric sensor having a NiCr 2 O 4 -SE and a specially manufactured FSZ electrolyte. The sensing characteristics to NO and to O 2 /NO-gas mixtures were analyzed at temperatures up to 700 °C. The cross-selectivity to other flue-gases was tested. As a new capable type of sensing parameter the total impedance was applied.
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