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Airtight thermocouple probe

  • US 5,520,461 A
  • Filed: 03/02/1994
  • Issued: 05/28/1996
  • Est. Priority Date: 03/02/1994
  • Status: Expired due to Term
First Claim
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1. Elevated temperature measuring apparatus capable of withstanding temperatures in excess of 1650°

  • C. for use in oxidizing environments comprising;

    a metallic thermocouple probe including first and second electrically conductive leads of dissimilar metals joined at an extreme sensing end and extending from said extreme sensing end to readout means distant therefrom;

    insulating means for electrically isolating said first and second electrically conductive leads from one another and for thermally isolating said first and second electrically conductive leads from heat external of said probe;

    structural sheath means for receiving said thermocouple probe and said insulating means and for providing mechanical strength to said thermocouple probe and said insulating means, said sheath means having an open end and a closed end, said extreme sensing end of said thermocouple probe located proximate said closed end; and

    encapsulating means enveloping said thermocouple probe, said insulating means, and said sheath means adjacent said extreme sensing end for providing a substantially oxygen impermeable barrier to prevent oxygen contained in said oxidizing environment from contacting said thermocouple probe, said insulating means, and said sheath means, and thereby render said thermocouple probe impermeable to the formation of oxides thereon which would render it inoperable.

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