Your ship is equipped with ALCAP heavy fuel oil purifiers. The watchstander reports excessive water drained from the fuel oil service tank. Which component should he check?

Correct Answer: Option C — The water transducer located in the clean oil discharge line.

Alfa Laval ALCAP systems monitor cleanliness continuously via a water transducer in the clean oil discharge line. If excessive water appears in the service tank, this sensor fails to detect rising water content or correctly trigger sludge discharge cycles, requiring inspection.