Protective sheath for a continuous measurement thermocouple
Disclosed is a protective thermocouple sheath of a magnesia graphite refractory material for use in continuous temperature measurements of molten metal in a metallurgical ladle and having a basic slag layer thereon. The sheath includes an elongated torpedo-shaped sheath body formed of a refractory composition and having an interior borehole extending axially therethrough and adapted to receive a thermocouple. The sheath body includes a lower end which is closed about the borehole and forms a narrow, tapered tip. The sheath body also includes a first body portion integral with the tapered tip and having a relatively constant cross section and providing a thin wall around the borehole. The sheath body also includes a second body portion having a relatively constant cross section larger than the cross section of the first body portion and providing a thicker wall around the borehole. The borehole terminates in an open end at the second body portion. The tapered tip is adapted to penetrate the slag layer and the thicker second body portion and its magnesia constituent material are adapted to withstand chemical attack thereon from the slag layer. The graphite constituent improves thermal conductivity of the refractory material and, thus, enhances the thermal responsiveness of the device. 4 figures.
- DOE Contract Number:
- AC07-76ID01570
- Assignee:
- Vesuvius Crucible Company, Pittsburgh, PA (United States)
- Patent Number(s):
- A; US 5069553
- Application Number:
- PPN: US 7-621859
- OSTI ID:
- 7274823
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
47 OTHER INSTRUMENTATION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
DESIGN
ELEMENTS
EQUIPMENT PROTECTION DEVICES
FLUIDS
LIQUID METALS
LIQUIDS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MEASURING INSTRUMENTS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SHAPE
TEMPERATURE MEASUREMENT
THERMAL CONDUCTIVITY
THERMOCOUPLES
THERMODYNAMIC PROPERTIES