Resources Contact Us Home
Thermocouple assembly

Image Number 2 for United States Patent #5071258.

A thermocouple assembly for sensing temperatures of molten metals in a metallurgical vessel, such as a tundish used in continuous steel casting, includes a double bore insulator containing the two noble metal alloy lead wires of the thermocouple. Platinum-rhodium alloys are preferred. The weld bead joining the ends of the leads or hot junction of the thermocouple is positioned within one of the bores of the insulator such that a lower purity alloy lead is exposed in the loop. The loop resides in a blind bore formed in the end of the double bore insulator and is enclosed in a containmemt zone by a refractory plug or foil disc closing off the end of the blind bore. The double bore insulator is received in an axial bore of a refractory sheath having a closed end adjacent the loop area of the thermocouple. The bores of the double bore insulator and refractory sheath communicate with the atmosphere to permit oxygen to diffuse therealong to the loop area to protect the platinum alloy from reaction with carbon and silica which may be present in trace amounts. A closed end molybdenum sheath having an axial bore receives the refractory sheath therein. High purity alumina powder is preferably packed around an upper annular space between the bore of the molybdenum sheath and the refractory sheath to prevent diffusion of atmospheric oxygen within the molybdenum bore and thereby minimize the formation of gaseous molybdenum oxide at molten steel temperatures.

  Recently Added Patents
External preparation composition for skin comprising ginseng flower or ginseng seed extracts
Processor engine, integrated circuit and method therefor
Nonvolatile semiconductor storage device and a manufacturing method thereof
Fast carrier allocation in multi-carrier systems
Methods and systems for presenting an inhalation experience
Image forming apparatus having a primary transfer unit, a secondary transfer unit, and a direct transfer unit
Pet fish burial pod
  Randomly Featured Patents
Computer front bezel
System, device, and method for cooperative processing
Constant angular velocity disk label printing
Heuchera plant named `Pinot Gris`
System and method for charging for data reception
Cleated cooler
File array storage architecture having file system distributed across a data processing platform
Collapsible cot assembly
Apparatus and method for adjusting interaction level, and storage medium for storing program therefor
Turbo type fluid machine and dry gas seal for use therefor