Recent Developments with High Temperature Stabilized‐Zirconia pH Sensors

Abstract

The pH response of 8 weight percent yttria‐stabilized zirconia sensors is examined over a temperature range of 373–573 K. Good pH response was found throughout the temperature range. The internal half‐cell was discovered to be poised by oxygen, which permits some simplification in the calibration of the sensor. Activation energy measurements imply that the primary conduction process involves the oxide ion. An improved electrical/mechanical seal is also discussed.