Liquid leak detection cable

Details Liquid leak detection cable Liquid leak detection cable

1991-11-21

1993-01-12

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

73 405R, 340605, 324533, G01M 316

Patent

active

051779960

ABSTRACT:
A leak detection cable for selectively sensing liquid organic chemicals is not affected by liquid water or water vapor. The cable includes a first electrical conductor and a second electrical conductor disposed in a coaxial or twin lead configuration. In the coaxial configuration, a porous insulation layer is disposed between the conductors, and a vapor-proof insulation layer surrounds the conductors. In the twin lead configuration, the conductors are encapsulated in a porous insulation layer which is surrounded by a vapor-proof insulation layer. The vapor-proof insulation allows passage of liquid organic chemicals while excluding water vapors and liquid water. The vapor-proof insulation includes a microporous insulation such as expanded, microporous polytetrafluoroethylene (ePTFE) which has been impregnated with a wax which is soluble in the liquid organic chemicals being detected.

REFERENCES:
patent: 3564526 (1971-02-01), Butts
patent: 4206632 (1980-06-01), Suzuki
patent: 4862066 (1989-08-01), Sato et al.
patent: 4877923 (1989-10-01), Sahakian
patent: 4910998 (1990-03-01), Willis et al.
patent: 4918977 (1990-04-01), Takahashi et al.
patent: 4926129 (1990-05-01), Wasley et al.

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