Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-04-17
1980-08-26
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340507, 340663, 340691, 307 95, 324 72, 324 65CR, G08B 2100
Patent
active
042198070
ABSTRACT:
The sensor system senses a drop in the flow of impressed cathodic protection current to a minimum threshold level. A potential difference is developed which is a sample of the cathodic protection current. A comparator receives the sample potential difference and normally produces an output control signal which drops to substantially zero when the cathodic protection current drops to a predetermined threshold level. A relay responsive to the control signal then switches a signaling device to its signaling condition. A standby battery is also coupled to the signaling device through the relay. In the event of any failure in the sensor system or in the primary source of power energizing the sensor system, the standby battery becomes connected to the signaling device to cause it to change to its signaling condition.
REFERENCES:
patent: 3247500 (1966-04-01), Grazio et al.
patent: 3264627 (1966-08-01), Austin
patent: 3603973 (1971-09-01), Hough
patent: 3696365 (1972-10-01), Ward
patent: 3769521 (1973-10-01), Caldwell et al.
patent: 3860912 (1975-01-01), Romans
patent: 3919565 (1975-11-01), Clark et al.
Beil Lawrence E.
Speck Robert M.
Breston Michael P.
Cathodic Protection Services, Inc.
Swann III Glen R.
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