Patent ID: 6913731

Claim:
Oxygen probe, meant for application in ducts through which flows a fluid and in which there exist extreme temperature and, particularly, extreme pressures, with a sensor element ( 2 ) of said probe housed in a mounting structure of the probe for coupling onto a pressurised duct or enclosure with the assistance of a gasket ( 7 ) which provides a hermetic mount for the probe, said mounting structure comprising a first metallic body ( 4 ) and a second metallic body ( 8 ) screwed axially inside the first body ( 4 ) pressing onto the sensor element ( 2 ), wherein a gasket ( 7 ) is interposed between said first body ( 4 ) and the duct characterized in that the first body ( 4 ) is provided with a neck ( 5 ) for mounting by a thread ( 6 ) on an orifice provided for such purpose on wall ( 3 ) of the duct or pressurised enclosure, said neck ( 5 ) surrounding the sensor element ( 2 ) and extending internally from the wall ( 3 ), the first body ( 4 ) having an internal seat for stopping the sensor element ( 2 ) in cooperation with a rear area provided in the sensor element ( 2 ) and with a deformable metallic washer to obtain a hermetic seal, the second body ( 8 ) being provided with an axial concentric passage wherein a metallic tube ( 9 ) and a protective sheath ( 14 ) are placed, the protective sheath ( 14 ) interposed therein providing insulation, said metallic tube ( 9 ) having soldered a metallic washer ( 10 ) which is in electric contact with the sensor element ( 2 ).