Sensor device for containers of liquid substances

A sensor device for a container of a liquid substance, the sensor device comprising a body with a housing portion having a closing structure, the body of the sensor device having an inner surface and an outer surface,

• wherein the housing portion is pre-arranged for being mounted on the container, in such a way that at least one portion of the outer surface of the body faces the inside of the container so as to be in contact with the liquid substance, and the inner surface of the body is isolated from the inside of the container,
• wherein a first arrangement for detection of the level of the liquid substance is associated to the body,
• wherein a second arrangement for detection of at least one characteristic of the liquid substance is associated to the body of the sensor device, the second arrangement comprising at least one emitter and at least one receiver of a given optical radiation;
• wherein at least one first portion of the body of the sensor device is made of a material suitable for propagation of the given optical radiation, the at least one emitter and the at least one receiver being optically coupled to the inner surface of the body at said first portion;
• and
• wherein said first portion of the body of the device is shaped so as to contribute to propagation of the given optical radiation by refraction and/or reflection from the at least one emitter to the at least one receiver, in such a way that the given optical radiation is at least in part propagated through said first portion of the body of the sensor device towards the at least one receiver, at an angle and/or with an intensity that are/is variable as a function of a characteristic of the liquid substance.