Conductivity probe for use in the presence of high intensity nuc

Details Conductivity probe for use in the presence of high intensity nuc Conductivity probe for use in the presence of high intensity nuc

1989-06-19

1991-02-05

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

324 713, 324446, 324464, 204431, 376256, G01N 2726

Patent

active

049908553

ABSTRACT:
A conductivity probe able to withstand high water temperatures and pressures, and intense nuclear radiation is suitable for use within the core of the nuclear reactor. The probe is made with a ceramic insulator, such as sapphire, and a central electrode that is mounted on the insulator. A sleeve that supports the insulator and the central electrode is made from metals having a coefficient of thermal expansion compatible with the coefficient of thermal expansion of the insulator, such as Kovar. The central electrode and sleeve are bonded to the insulator by a brazed compressive seal that protects an internal conductor in the probe from intrusion of the reactor water. A counter electrode made from a corrosion resistant metal, such as Kovar, is attached to the sleeve so that it extends over the central electrode a fixed, spaced distance. A positioning and signal transfer arrangement operatively supports the sleeve and conveys electrical signals to and from the two electrodes.

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patent: 4948492 (1990-08-01), Niedrach
Ceramic to Metal Sealing, L. Reed, Electronic Ceramics, Special Publication No. 3, American Ceramic Society, pp. 34-42, CA 1970.
Ceramic to Metal Bonding, C. I. Helges, Boston Technical Publishers, Cambridge, Mass., 1968, pp. 8-21.
Materials and Techniques for Electron Tubes, W. H. Kohl, Reinhold Publishing Corp., N.Y., N.Y., 1960, pp. 488-493.

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