Abstract: The sanitary appliance (400) comprises a receptacle (410) and a tube (420) provided with a tube wall (401, 402) and configured to contain—in use—an aqueous solution (1000) and a sensor circuit (105) for sensing inflow of matter into the sanitary appliance (400), wherein the sensor circuit (105) comprises a primary circuit and a secondary circuit that are mutually inductively coupled, wherein the inductively coupled secondary circuit includes a capacitive sensor comprising a first and a second electrode (101, 102), each of which are configured to be in use at least partially (101, 192) in contact with the aqueous solution (1000), which constitutes a medium of the capacitive sensor.

Abstract: The sanitary appliance comprising a receptacle provided with a flow surface and further comprising at least one sensor for sensing flow of urine (a physiological solution) located at a distance from the flow surface of the receptacle, characterised in that the sensor comprises a resonance circuit. Urine flow may be identified at the flow surface in that: (1) a first voltage is provided to a resonance circuit to be modified into a second voltage; (2) the second voltage is sensed and (3) the second voltage is compared with a reference value for identification of urine flow. Furthermore a dirt layer with a thickness at the flow surface may be identified.