Protective sheath for a continuous measurement thermocouple
- Highland, MD
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.
- Research Organization:
- EG & G IDAHO INC
- DOE Contract Number:
- AC07-76ID01570
- Assignee:
- Vesuvius Crucible Company (Pittsburgh, PA)
- Patent Number(s):
- US 5069553
- OSTI ID:
- 868079
- Country of Publication:
- United States
- Language:
- English
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adapted
attack
axially
basic
basic slag
borehole
chemical
chemical attack
closed
composition
conductivity
constant
constituent
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continuous
continuous measurement
continuous temperature
device
disclosed
elongated
enhances
extending
extending axially
formed
forms
graphite
improves
integral
interior
ladle
larger
layer
layer thereon
magnesia
material
measurement
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molten
molten metal
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protective sheath
providing
receive
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refractory material
relatively
relatively constant
responsiveness
section
sheath
slag
slag layer
tapered
temperature
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temperature measurement
temperature measurements
terminates
thereon
therethrough
thermal
thermal conductivity
thermocouple
thermocouple sheath
thicker
tip
torpedo-shaped
wall
withstand