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Title: Method for in-situ restoration of plantinum resistance thermometer calibration

Abstract

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.

Inventors:
 [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
866810
Patent Number(s):
4795884
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; 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; /219/324/374/

Citation Formats

Carroll, Radford M. Method for in-situ restoration of plantinum resistance thermometer calibration. United States: N. p., 1989. Web.
Carroll, Radford M. Method for in-situ restoration of plantinum resistance thermometer calibration. United States.
Carroll, Radford M. Sun . "Method for in-situ restoration of plantinum resistance thermometer calibration". United States. https://www.osti.gov/servlets/purl/866810.
@article{osti_866810,
title = {Method for in-situ restoration of plantinum resistance thermometer calibration},
author = {Carroll, Radford M.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Patent:

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