Methods and apparatus for detecting abnormalities in proximity e

Details Methods and apparatus for detecting abnormalities in proximity e Methods and apparatus for detecting abnormalities in proximity e

1983-09-30

1986-01-14

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219301, 219300, 219503, 361 45, 361 57, 361 87, 324 51, H05B 102, H02H 316

Patent

active

045647470

ABSTRACT:
Methods and apparatus for detecting abnormalities in proximity effect pipeline tracing circuits by coupling conductive elements carrying proximity effect circuit currents and having opposite polarities. These conductive elements are coupled to an additional conductive element which is in turn connected to a system for detecting current so that when the difference between the proximity effect circuit currents is non-zero, the current flows through the additional conductive element and is detected by a relay or ammeter.

REFERENCES:
patent: 3571561 (1971-03-01), Ando
patent: 3801871 (1974-04-01), Loh
patent: 3857069 (1974-12-01), Howell
patent: 4200897 (1980-04-01), Dawley
patent: 4316229 (1982-02-01), Helwig, Jr.
patent: 4392174 (1983-07-01), Cadet et al.

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