Hot gas measuring device.

摘要

A hot gas measuring device comprising a tube (28) made of solid electrolyte material is slideably mounted within a ceramic support tube (24) which is mounted to project into the interior of a furnace. The end of the electrolyte tube (28) is closed and the support tube (24) has open ports (26) or windows therein which expose the exterior end surface of the electrolyte tube (28) to the hot furnace gases and causes a voltage to develop between the interior and the exterior surfaces of the electrolyte tube (28) which is indicative of a furnace gas characteristic. A first electrode (36) is supported between the ends of the electrolyte tube (28) and the support tube (24), and a second electrode (38) is supported within the inner end of the electrolyte tube (28). To prolong the life of the electrode (36) it is preferably made either of mtiltiple layers of noble metal wire screens mounted in face-to-face relationship, a chemically stable electronic ceramic conductor such as cation-doped lanthanum chromite, or a noble metal screen coated with an electronic conducting ceramic cement