Abstract: An elongated sensor for detecting the presence of a particular fluid includes first and second conductors, both extending from the proximal end to the distal end of the sensor. The second conductor includes a swellable conductor, at least a portion of the swellable conductor is swollen when in contact with the fluid and its conductance at least 10 times less when the portion is in contact with the fluid than when absent contact with the fluid. The second conductor further includes a subsidiary conductor in direct contact with the swellable conductor. In one embodiment the first conductor is isolated from the second conductor in the inner part of the sensor, and the two conductors are electrically connected at the distal end of the sensor. In another embodiment, the first contactor is in direct contact with the subsidiary conductor within the inner part of the sensor.

Abstract: An elongated sensor for detecting the presence of a particular fluid includes first and second conductors, both extending from the proximal end to the distal end of the sensor. The second conductor includes a swellable conductor, at least a portion of the swellable conductor is swollen when in contact with the fluid and its conductance at least 10 times less when the portion is in contact with the fluid than when absent contact with the fluid. The second conductor further includes a subsidiary conductor in direct contact with the swellable conductor. In one embodiment the first conductor is isolated from the second conductor in the inner part of the sensor, and the two conductors are electrically connected at the distal end of the sensor. In another embodiment, the first contactor is in direct contact with the subsidiary conductor within the inner part of the sensor.

Abstract: A sensor cable of conductive and non-conductive liquids leaks for example stored in a tank or flowing in a pipe. The cable is composed of a main body and at least one sensor element made of a central wire surrounded by an insulating sheath, itself integrated in an expandable conductive sheath, the wire and the expandable conductive sheath being arranged to contact conductive and non-conductive fluids, the main body being formed by extruding a plastic material and extruded on a central support in the form of either a plastic rod or a metal rod coated with plastic. This can be applied to liquid leakage watch systems.

Abstract: A sensor cable of conductive and non-conductive liquids leaks for example stored in a tank or flowing in a pipe. The cable is composed of a main body and at least one sensor element made of a central wire surrounded by an insulating sheath, itself integrated in an expandable conductive sheath, the wire and the expandable conductive sheath being arranged to contact conductive and non-conductive fluids, the main body being formed by extruding a plastic material and extruded on a central support in the form of either a plastic rod or a metal rod coated with plastic. This can be applied to liquid leakage watch systems.