Referring to the impressed current cathodic hull protection system shown in the illustration, if required to control the impressed current to the anodes manually by using the hand adjustment potentiometer, what parameter should be maintained at a constant value? EL-0090

Correct Answer: Option A — Reference control voltage

Manual potentiometer adjustments rely on maintaining a constant reference control voltage, which directly corresponds to the optimum protective potential between the wetted steel hull and the surrounding seawater environment, preventing both under-protection and hydrogen embrittlement.