Method for in-situ restoration of plantinum resistance thermometer calibration
Patent
·
OSTI ID:866810
- Oak Ridge, TN
A method is provided for in-situ restoration of platinum resistance thermometers (PRT's) that have undergone surface oxide contamination and/or strain-related damage causing decalibration. The method, which may be automated using a programmed computer control arrangement, consists of applying a dc heating current to the resistive sensing element of the PRT of sufficient magnitude to heat the element to an annealing temperature and maintaining the temperature for a specified period to restore the element to a stress-free calibration condition. The process anneals the sensing element of the PRT without subjecting the entire PRT assembly to the annealing temperature and may be used in the periodic maintenance of installed PRT's.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4795884
- OSTI ID:
- 866810
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/219/324/374/
annealing
annealing temperature
anneals
applying
arrangement
assembly
automated
calibration
causing
computer
computer control
condition
consists
contamination
control
control arrangement
current
damage
dc
decalibration
element
entire
heat
heating
heating current
in-situ
in-situ restoration
installed
magnitude
maintaining
maintenance
method
oxide
oxide contamination
period
periodic
plantinum
platinum
platinum resistance
process
programmed
provided
prt
resistance
resistance thermometer
resistive
restoration
restore
sensing
sensing element
specified
strain-related
stress-free
subjecting
sufficient
sufficient magnitude
surface
surface oxide
temperature
thermometer
thermometers
undergone
annealing
annealing temperature
anneals
applying
arrangement
assembly
automated
calibration
causing
computer
computer control
condition
consists
contamination
control
control arrangement
current
damage
dc
decalibration
element
entire
heat
heating
heating current
in-situ
in-situ restoration
installed
magnitude
maintaining
maintenance
method
oxide
oxide contamination
period
periodic
plantinum
platinum
platinum resistance
process
programmed
provided
prt
resistance
resistance thermometer
resistive
restoration
restore
sensing
sensing element
specified
strain-related
stress-free
subjecting
sufficient
sufficient magnitude
surface
surface oxide
temperature
thermometer
thermometers
undergone