H - Electricity – 01 – L
Patent
H - Electricity
01
L
356/100
H01L 35/02 (2006.01)
Patent
CA 1076264
ABSTRACT OF THE DISCLOSURE: A device for continuously monitoring the internal surface temperature of a refractory lining in a metallurgical furnace. The device comprises an outer sheath, a pair of dis- similar, metallic wires within the outer sheath and a powdered oxide material closely packed within the sheath and surrounding both wires. Each wire is separately insulated by a sleeving of a refractory material having a melting point higher than the normal working temperature of the furnace at the surface of the lining. The oxide material used as a packing between the outer sheath and the wires is electrically conductive at elevated temperatures and has also a melting point higher than the tem- perature normally encountered at the surface of the lining. Both the insulating refractory material and conductive oxide material, when exposed to the aforesaid normal working tempe- rature, react with each other to form a conducting bridge between the dissimilar wires at the surface of the lining, which bridge is operative to provide a signal related to the internal surface temperature of the lining. This reaction requires a temperature substantially equivalent to that normally encounter- ed at the surface of the lining; thus, there is no chance that it will occur at an appreciable distance therefrom, so result- ing in a conducting bridge distant from the temperature to be measured, which would give spurious temperature readings.
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