A miniaturized two-electrode sensor for the simultaneous detection of oxyge
n and nitrogen monoxide in oxygen, nitrogen, NO gas mixtures has been devel
oped by using thick film technology. The solid state electrochemical sensor
, based on yttria-stabilized zirconia, operates in the amperometric mode. O
xygen concentrations ranging up to 5 vol.% and NO concentrations ranging up
to 2500 ppm can be detected separately and simultaneously. The diffusion p
roperties of the diffusion barrier of the sensor have been determined by th
e current dependence on the working temperature. (C) 2000 Elsevier Science
B.V. All rights reserved.