Sensor assembly for a halogen gas leak detector

摘要

A sensor assembly for a halogen gas leak detector characterized by including a tubular, porous, high purity Alumina (Al2O3) element for supporting electrode and heater components in spaced-apart relationship relative to one another and a surrounding housing. The porous Alumina element is doped with an alkali metal by methods that cause the alkali metal to be distributed throughout the porous Alumina structure. The assembly is further characterized by incorporating a ribbon-like heater coil helically wound around the tubular Alumina element. In one embodiment of the invention the Alumina element is provided with a stepped end structure that effectively insulates the ends of an electrode mounted within the tubular element from the surrounding housing.