Airtight thermocouple probe
US5520461A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1994 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Mar 2, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A metallic thermocouple probe is capable of withstanding temperatures in excess of 1650.degree. C. in oxidizing environments. First and second electrically conductive leads of dissimilar metals are joined at an extreme sensing end and extend to a distant readout device. Metal oxide insulation such as beryllium oxide, magnesium oxide, and aluminum oxide, electrically isolates the conductive leads and thermally isolates them from the environment. The extreme sensing end of the thermocouple probe is encapsulated to render it impermeable to the formation of oxides thereon. This encapsulation includes a protective coating composed of a non-porous ceramic material, preferably a cementation applied disilicide. Additionally, a high temperature structural sheath overlies the insulation adjacent the extreme sensing end and a low temperature sheath overlies the insulation adjacent the first sheath distant from the extreme sensing end. The first and second sheaths abut at a sheath junction and a splice cover overlies the sheath junction and is attached to the first and second sheaths. The first sheath is composed of a refractory metal such as tungsten, tantalum, molybdenum, columbium-zirconium…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.