Title: Sensor system for an impressed cathodic protection circuit

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.

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Inventors: Speck, Robert M. (Richmond, TX, US)
Beil, Lawrence E. (Kingwood, TX, US)

Application Number: 896954
Filing Date: 1978-04-17
Publication_date: 1980-08-26
Assignee: Cathodic Protection Services, Inc. (Houston, TX)
Primary Class(es): 340/664 307/95, 324/72, 340/507, 340/663, 340/691.8
Other Classes:
US Patent Ref:

3247500	Apr, 1966	Grazio et al.	340/663.
3264627	Aug, 1966	Austin	340/507.
3603973	Sep, 1971	Hough	340/693.
3696365	Oct, 1972	Ward	340/664.
3769521	Oct, 1973	Caldwell et al.	307/95.
3860912	Jan, 1975	Romans	340/664.
3919565	Nov, 1975	Clark et al.	340/664.

Other Refs:
Primary Examiner: Swann, III, Glen R.
Assistant Examiner:
Attorney: Breston; Michael P.