Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1976-06-28
1978-07-18
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
G01N 2746
Patent
active
041014049
ABSTRACT:
A probe comprising a tube made of solid electrolyte material is slidably mounted within a ceramic support tube which is mounted to project into the interior of a furnace. The end of the electrolyte tube is closed and the support tube has open ports or windows therein which expose the exterior end surface of the electrolyte tube to the hot furnace gases and causes a voltage to develop between the interior and the exterior surfaces of the electrolyte tube which is indicative of a furnace gas characteristic. A first electrode is supported between the ends of the electrolyte tube and the support tube, and a second electrode is supported within the inner end of the electrolyte tube. A hollow cylindrical cap is adjustably mounted adjacent the outer end of the electrolyte tube and contains an internal spring which urges the closed end of the electrolyte tube against the first electrode to maintain good electrical contact therebetween in spite of corrosive reaction of the electrode with the hot furnace gases or the electrolyte. To prolong the life of the electrode, it is preferably made either of two noble metal wire screens mounted in face-to-face relationship, or it is made of a chemically stable electronic ceramic conductor such as cation-doped lanthanum chromite, which is substantially inert with respect to known electrolytes and known hot furnace gases.
REFERENCES:
patent: 3960692 (1976-06-01), Weyl et al.
Blumenthal Robert N.
Melville Andreas T.
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