Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1987-10-23
1989-01-03
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219494, 219505, 219492, 374183, 374185, 374 1, 324 63, H05B 102
Patent
active
047958847
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.
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patent: 4436438 (1984-03-01), Voznick
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patent: 4638960 (1987-01-01), Staube et al.
Breeden David E.
Hamel Stephen D.
Hightower Judson R.
Paschall M. H.
The United States of America as represented by the United States
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