A monitor device for an ostomy system comprising an ostomy appliance with a base plate and a method of monitoring an ostomy appliance is disclosed. The monitor device comprises a processor configured to apply a processing scheme； memory； a first interface connected to the processor and the memory, the first interface configured for collecting ostomy data from the base plate coupled to the first interface； and a second interface connected to the processor, wherein to apply a processing scheme comprises: obtain first parameter data, second parameter data, and third parameter data based on the ostomy data； and determine an operating state of the base plate of the ostomy appliance based on the first parameter data, the second parameter data and the third parameter data, wherein the operating state is indicative of a degree of radial erosion of the base plate and/or acute leakage risk for the ostomy appliance, wherein the monitor device is configured to, in accordance with a determination that the operating state is a first operating state, transmit a first monitor signal comprising monitor data indicative of the first operating state of the base plate via the second interface； and in accordance with a determination that the operating state is a second operating state, transmit a second monitor signal comprising monitor data indicative of the second operating state of the base plate via the second interface.
