Capacitive sensor device for use at high temperature and pressure, including a coaxial cable with integrated end portion
AssigneeThermocoax
InventorsGilles Bailleul, Samim Albijat
Life of this patent
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Abstract
A capacitive sensor device for use at least up to 1300.degree. C. and 40 bar, including a coaxial cable comprising a conductive sleeve (10) and at least one inner conductor (21) which are separated by an insulator (19), said cable having an end portion (1) of enlarged diameter forming a probe in which the insulator is an anticorrosive refractory element (9, 29) locked by a first and a second anticorrosive refractory metal protection element (5, 4), welded to the sleeve and to said inner conductor, respectively, which second protection element forms an electrode (4) having a flat surface (4a) of an area larger than the cross-sectional area of the end portion of the inner conductor.
Claims10
A capacitive sensor device for use at least up to 1300.degree. C. and 40 bar, including a coaxial cable comprising
- a conductive sleeve (10);
- at least one inner conductor (21);
- an insulator (19) separating the conductive sleeve and the inner conductor;
- and
- an end portion (1) of larger diameter than the rest of the cable and forming a probe, the probe including
- a probe insulator made of an anticorrosive refractory element (9, 29);
- and
- a first and a second anticorrosive refractory metal protection element (5, 4), welded to the sleeve and to said inner conductor, respectively, for locking the probe insulator, which second protection element acts as an electrode (4) having a flat surface (4a) of an area larger than the cross-sectional area of an end portion of the inner conductor.
A method of realizing a capacitive sensor device usable at least up to 1300.degree. C. and 40 bar, comprising the steps of:
- forming a coaxial cable (20) having a cylindrical metal sleeve (10) separated from an inner conductor (21) by an insulator (19), and
- forming an end portion (1) of a diameter larger than the rest of the cable to form a probe in which a probe insulator is a refractory element (9, 29),
- the probe insulator being locked by a first and a second anticorrosive refractory metal protection element (5, 4),
- which first and second protection elements are welded (11a, 11b) to the sleeve and to said inner conductor, respectively,
- which second protection element forms an electrode (4) having a flat surface (4a) of an area larger than the cross-sectional area of the end portion of the inner conductor.
Dependencies are inferred from the claim text.