Disclosed is a sensor assembly part for a base plate of an ostomy system and an associated method for operating a monitor device, wherein the sensor assembly part comprises: an electrode assembly including a plurality of electrodes, each electrode including a sensing part and a connection part, the connection part being configured to electrically couple the sensing part to a monitor device of the ostomy system; a monitor interface configured to couple the sensor assembly part to the monitor device; and a first identifier element configured to be queried by the monitor device.