Abstract
A differential arrangement has been used to study the equilibrium conditions between gases and electrodes in solid-state electrochemical oxygen gauges. At relatively low temperatures, the flux of oxygen from the reference to the analysed gas resulting from the electrolyte semipermeability is negligible as far as the oxygen content in the analysed gas is concerned but is still sufficient to disturb the equilibrium conditions near the electrode triple contact; noticeable errors are thereby introduced in the measurement of low oxygen partial pressures. Two new procedures are proposed for measuring very low oxygen partial pressures. By these procedures the Nernst and Faraday laws were verified with accuracies of the order of a few per cent for oxygen concentrations of less than 1 ppm in argon.
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