Method for in-situ restoration of plantinum resistance thermometer calibration
- 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 (United States)
- 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
in-situ
restoration
plantinum
resistance
thermometer
calibration
provided
platinum
thermometers
prt
undergone
surface
oxide
contamination
strain-related
damage
causing
decalibration
automated
programmed
computer
control
arrangement
consists
applying
dc
heating
current
resistive
sensing
element
sufficient
magnitude
heat
annealing
temperature
maintaining
specified
period
restore
stress-free
condition
process
anneals
subjecting
entire
assembly
periodic
maintenance
installed
control arrangement
sensing element
computer control
annealing temperature
resistance thermometer
oxide contamination
heating current
sufficient magnitude
in-situ restoration
surface oxide
platinum resistance
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