Temperature sensing cable device and method of making same
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United States of America Patent
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Feb 9, 1993
Grant Date -
N/A
app pub date -
May 20, 1991
filing date -
May 20, 1991
priority date (Note) -
Expired
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Abstract
A continuous temperature sensing cable formed of a polymer containing conductive and semi-conductive fillers such as polyethylene with carbon black, powdered metals and metal oxides controlled within the range of from about eight percent (8%) to about fifteen percent (15%). The composition is extruded with a pair of elongated substantially parallel conductors which are spaced apart along the longitudinal length of the cable. The conductors are single endedly connected to a control/alarm device for monitoring the continuous length of the temperature sensing cable. The control/alarm device may be a time domain reflectometer TDR for accurate determination of localized discontinuities caused by high temperatures along the length of the temperature sensing cable. Alternatively, a critical voltage may be applied single-endedly to the conductors and serially connected to an audible alarm to detect tunneling conduction when operated at a temperature near the melt temperature of the composition.
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