Abstract
A solid electrolyte oxygen sensor was constructed from two fully stabilised zirconia discs and a gold seal. One of the discs incorporated a single laser-drilled pore which acted as the diffusion barrier. The amperometric device operated satisfactorily in the range 2–21 vol.% O 2 and was relatively insensitive to temperature variations of ±50°C: it would be suitable for monitoring and control of the air to fuel ratio of combustion processes operated lean of stoichiometry. The gauge was valuable for detecting device malfunctions and also for establishing that the device was operating in the linear, diffusion-limited region.
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