The disclosed is an ostomy system configured to detect a leakage of output between a base plate and/or a sensor assembly part of the ostomy system and a surface of a subject and a method of detecting the leakage of output. The ostomy system including the base plate and/or the sensor assembly part and a monitor device, the base plate and/or the sensor assembly part comprising (i) a first adhesive layer having a distal surface, a proximal surface, and a first plurality of openings, and (ii) an electrode assembly comprising a plurality of electrodes and a masking element between the plurality of electrodes and the first adhesive layer, the masking element having a second plurality of openings aligned with the first plurality of openings of the first adhesive layer, each of the aligned first and second plurality of openings exposes a portion of one of the plurality of electrodes to define one of a plurality of sensor points, the monitor device electrically coupled to the plurality of electrodes of the base plate and/or the sensor assembly part.