Electricity: measuring and testing – Electrolyte properties
Patent
1991-10-24
1993-06-01
Harvey, Jack B.
Electricity: measuring and testing
Electrolyte properties
204404, 324 711, G01N 2742
Patent
active
052163709
ABSTRACT:
A cathodic protection monitoring system which provides IR drop free cathodic protection potential measurements which are indicative of the effectiveness of the cathodic protection system. The system measures the polarized potential between a reference electrode and a coupon subsequent to decoupling the coupon from the protected structure. The present invention controls the time or times at which the potential is measured in order to ensure that the potential is measured only after the polarized potential has achieved a relatively steady state value. More particularly, the cathodic protection monitoring system controllably measures the polarized potential after the potential has stabilized to the extent that there are no inductive or capacitive voltage spikes present, and before the coupon potential decays significantly due to depolarization. The system also can eliminate or reduce to an acceptable level the impact of telluric and other stray DC currents in the earth or structure metal path on the potential values measured.
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Bushman James B.
Swiat Wayne J.
Corrpro Companies Inc.
Harvey Jack B.
Regan Maura K.
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