Method for in-situ restoration of platinum resistance thermometer calibration

Carroll, R M

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

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Abstract

A method is provided for in-situ restoration of platinum resistance thermometers (PRT's) that have undergone surface oxide contamination and/or stain-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. 1 fig.

Inventors:: Carroll, R M

Issue Date:: 1987-10-23

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

OSTI Identifier:: 7098853

Patent Number(s):: 6111489

Assignee:: TIC; ERA-14-001597; EDB-88-186305

Patent Classifications (CPCs):: H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01H - ELECTRIC SWITCHES

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H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01H - ELECTRIC SWITCHES
H01H83/144 - {with differential transformer}

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DOE Contract Number:: AC05-84OR21400

Resource Type:: Patent

Resource Relation:: Other Information: Portions of this document are illegible in microfiche products

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION; COMPUTERIZED CONTROL SYSTEMS; DESIGN; THERMOMETERS; CALIBRATION STANDARDS; ELECTRIC HEATING; INVENTIONS; PLATINUM; CONTROL SYSTEMS; ELEMENTS; HEATING; MEASURING INSTRUMENTS; METALS; PLATINUM METALS; STANDARDS; TRANSITION ELEMENTS; 440300* - Miscellaneous Instruments- (-1989)

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                    Carroll, R M. Method for in-situ restoration of platinum resistance thermometer calibration.  United States: N. p., 1987. 
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                    Carroll, R M. Method for in-situ restoration of platinum resistance thermometer calibration.  United States.

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                    Carroll, R M. Fri .  
        "Method for in-situ restoration of platinum resistance thermometer calibration".  United States.

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@article{osti_7098853,

  title        = {Method for in-situ restoration of platinum resistance thermometer calibration},

  author       = {Carroll, R M},

  abstractNote = {A method is provided for in-situ restoration of platinum resistance thermometers (PRT's) that have undergone surface oxide contamination and/or stain-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. 1 fig.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1987},

  month        = {10}

}

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