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
Automatic image-content based adjustment of printer printing procedures
Apparatus and method for encoding/decoding signal
Information processing apparatus, information processing method, and program
Scalable header extension
Nucleotide sequence coding for variable regions of .beta. chains of human T lymphocyte receptors, corresponding peptide segments and the diagnostic and therapeutic uses
Method and structure for image local contrast enhancement
Methods and apparatus to perform time zone determination by a mobile station
  Randomly Featured Patents
Marine propulsion system
Processes for preparing organic compounds having improved color characteristics
Image forming apparatus having a magnetic brush toning station
Printed circuit board for a CCD camera head
Software supportability certification
System for automated selection of a communications unit for refrigerating containers
System, method, and service for using a focused random walk to produce samples on a topic from a collection of hyper-linked pages
Spectroscopic determination of characteristic of biological material
Methanol steam reforming catalysts, steam reformers, and fuel cell systems incorporating the same
Driving force control system for a vehicle