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

Abstract

A method is described for the in situ restoration of a platinum resistance thermometer, which has become decalibrated due to oxide surface film formation and/or strain-related damage, to a stress-free calibration condition wherein the thermometer includes a platinum resistor sensing element whose resistance varies with the temperature of the element in accordance with a known relationship. The method consists of: passing a controlled dc current through the platinum resistor sensing element, the current having a magnitude sufficient to raise the temperature of the element to its oxide decomposition and annealing temperature. The current is maintained for a heating period sufficient to restore the element to an oxide free surface and stress-free calibration condition.

Inventors:
Publication Date:
OSTI Identifier:
6468478
Patent Number(s):
US 4795884
Assignee:
Dept. of Energy, Washington, DC
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 23 Oct 1987
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; THERMOMETERS; DESCALING; ANNEALING; CALIBRATION; CORROSION; DAMAGE; DECOMPOSITION; DEPOSITS; DIRECT CURRENT; OXIDATION; OXIDES; PLATINUM; RESISTORS; TEMPERATURE EFFECTS; TEMPERATURE MEASUREMENT; THERMAL CONDUCTIVITY; CHALCOGENIDES; CHEMICAL REACTIONS; CURRENTS; ELECTRIC CURRENTS; ELECTRICAL EQUIPMENT; ELEMENTS; EQUIPMENT; HEAT TREATMENTS; MEASURING INSTRUMENTS; METALS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PLATINUM METALS; SURFACE FINISHING; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENTS; 440400* - Well Logging Instrumentation

Citation Formats

Carroll, R M. Method for in-situ restoration of platinum resistance thermometer calibration. United States: N. p., 1989. Web.
Carroll, R M. Method for in-situ restoration of platinum resistance thermometer calibration. United States.
Carroll, R M. 1989. "Method for in-situ restoration of platinum resistance thermometer calibration". United States.
@article{osti_6468478,
title = {Method for in-situ restoration of platinum resistance thermometer calibration},
author = {Carroll, R M},
abstractNote = {A method is described for the in situ restoration of a platinum resistance thermometer, which has become decalibrated due to oxide surface film formation and/or strain-related damage, to a stress-free calibration condition wherein the thermometer includes a platinum resistor sensing element whose resistance varies with the temperature of the element in accordance with a known relationship. The method consists of: passing a controlled dc current through the platinum resistor sensing element, the current having a magnitude sufficient to raise the temperature of the element to its oxide decomposition and annealing temperature. The current is maintained for a heating period sufficient to restore the element to an oxide free surface and stress-free calibration condition.},
doi = {},
url = {https://www.osti.gov/biblio/6468478}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 03 00:00:00 EST 1989},
month = {Tue Jan 03 00:00:00 EST 1989}
}