Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1988-08-24
1989-08-29
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
338 34, 204430, H01L 700
Patent
active
048620661
ABSTRACT:
An oil leakage sensor element is provided wherein a plurality of electrical conductors are contained within and separated from each other by a continuously porous polytetrafluoroethylene (PTFE) material containing from 15 to 40 weight percent carbon particles, the carbon particles having irregular shapes and average diameter between 10 and 30 millimicrons, at least a portion of the exterior surfaces of the carbon particles being exposed at the pore walls of the PTFE and extending into the pores. The porous PTFE material is preferably obtained by stretching an extruded, unsintered PTFE film containing the carbon particles, after removal of lubricant, to a draw ratio of 1.5 times or less. The sensor element, in use, is connected between electrodes which, in turn, are connected to an alarm device. Preferably, the sensor is connected to elongate conductors (wires) such that the direction of stretch of the material is aligned with the lengthwise direction of the conductors.
REFERENCES:
patent: 4082997 (1978-04-01), Ohtsu
patent: 4125822 (1978-11-01), Perren
patent: 4142400 (1979-03-01), Colla
patent: 4631952 (1986-12-01), Donaghey
Ishikawa Tazuru
Sato Yoshiaki
Eisenzopf Reinhard J.
Junkosha Co. Ltd.
Solis Jose M.
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