| 摘要 |
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. |
