Methods, systems and apparatus for detecting changes in variable

Details Methods, systems and apparatus for detecting changes in variable Methods, systems and apparatus for detecting changes in variable

1988-06-03

1990-05-01

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324522, 324539, G01R 2702

Patent

active

049221833

ABSTRACT:
A system for detecting a fault, e.g. a liquid leak from a pipe or vessel containing an electrolyte or a hydrocarbon. In one embodiment, the system comprises a central unit and a plurality of sub-units; each of the sub-units is powered in turn from a power source in the central unit, and the sub-unit generates a signal which is observed by the central unit and which identifies the presence of a fault. In another embodiment, signals generated by a detection system at different times are compared and the decision whether to generate a fault alarm is based on that comparison. In another embodiment the system (a) when there is no fault, is a monitoring system which comprises a continuous loop which can be tested to ensure continuity of the system, and which comprises a continuity connection, and (b) when a fault occurs, is a test system in which the location (or other characteristic) of the fault can be determined; there is a constant current source in the continuity connection, and/or the continuity connection is present in the test system as well as the monitoring system and comprises a constant current source in the test system.

REFERENCES:
patent: 3281673 (1966-10-01), Richardson
patent: 3723864 (1973-03-01), Ricard
patent: 4418312 (1983-11-01), Figler et al.
patent: 4446421 (1984-05-01), Berde
patent: 4523187 (1985-06-01), Begg
patent: 4605827 (1986-08-01), Chattler

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