Improved solid electrolyte gas sensing apparatus.

摘要

An alkali Ion conductive solid electrolyte eiectrochemi- cal concentration cell assembly (10) for selectively monitoring gases (MG) containing anhydrides or related compounds in air or in oxygen-bearing gases containes two substantially Identical alkali ion conductive half-cells (22, 24). Each half-cell is secured to opposite surfaces of the closed end (E) of a solid membrane exhibiting alkali ion conductivity corresponding to the alkali ion conductivity of the half-cells (22, 24). The membrane (M) effectively isolates a monitored gas environment (MG) contacting one half-cell (23) from a reference gas environment contacting the other half-cell (25) while supporting the equilibrium mode of operation of the concentration cell assembly (10) to generate an electrical signal indicative of a gas species of interest in the monitored gas environment (MG).