Cathodic protection monitor

Details Cathodic protection monitor Cathodic protection monitor

2007-02-27

2009-12-15

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C340S870070

Reexamination Certificate

active

07633302

ABSTRACT:
The cathodic protection monitor includes a CPU that reads, digitizes and stores analog current and voltage signals which are supplied from the DC output of the rectifier and are indicative of the effectiveness thereof. The monitor includes an ISM band transceiver and antenna by which the CPU is polled and from which packets of stored data are transmitted to a data collector at an overhead airplane or nearby motor vehicle for retransmission and analysis by the pipe owner or maintenance crew. Synchronized timing signals are supplied (from the National Bureau of Standards) to a stable auxiliary clock by way of a WWVB transceiver and antenna so that a plurality of cathodic protection rectifiers can be turned on and off at the same time as may be required to compile ground voltage readings along the pipeline as part of a government-mandated survey.

REFERENCES:
patent: 4356444 (1982-10-01), Saenz, Jr. et al.
patent: 4664764 (1987-05-01), Zofan
patent: 6498568 (2002-12-01), Austin et al.
patent: 6992594 (2006-01-01), Dudley
patent: 7068052 (2006-06-01), Hilleary et al.
patent: 2004/0232924 (2004-11-01), Hilleary et al.

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