| 摘要 |
<p>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 dissimilar, 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 temperature normally encountered at the surface of the lining. Both the insulating refractory material and conductive oxide material, when exposed to the aforesaid normal working temperature, 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 encountered at the surface of the lining; thus, there is no chance that it will occur at an appreciable distance therefrom, so resulting in a conducting bridge distant from the temperature to be measured, which would give spurious temperature readings.</p> |
