E-Log I field computer

Details E-Log I field computer E-Log I field computer

1982-12-10

1985-04-16

Tokar, Michael J.

Electricity: measuring and testing

Electrolyte properties

324 711, 324 72, G01N 2742

Patent

active

045118442

ABSTRACT:
An E-Log I field computer includes a controlled power supply, timers, and a current level stepping relay for circulating cathodic current through a buried metal structure, interrupting the current to allow the decay of residual polarization of the structure and electrolytes within the surrounding ground, and measuring the circulated current and the voltage of structure relative to the ground. The circulated current, voltage of the structure to the ground, and other parameters of interest, such as, the output voltage of the power supply are printed. Then the current level is increased by the stepping relay, and the process is repeated. When a sufficient number of readings have been taken, the data is plotted as a semi-log graph, resulting in an E-log I curve from which the corrosion current and therefore the cathodic protection voltage can be determined.

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