| 摘要 |
The present invention relates to a device to regulate the level of a liquid inside a boiler (40) of a coffee machine (10), comprising a transparent duct (24) connected to the boiler (40) and designed to visibly display the level of the liquid inside the boiler, a capacitive sensor that can be positioned outside the transparent duct (24) in determined positions and designed to generate electric signals representing the presence or absence of liquid in correspondence to the position of the sensor along the transparent duct. The sensor of the device (12) comprises first measuring elements (30a) and second measuring elements (30b), both of capacitive type; the second measuring elements (30b) are positioned at a predetermined distance from the first measuring elements (30a), and measuring means (70) are designed to measure the impedance between the first and second measuring elements (30a, 30b) and to generate signals indicating the presence or absence of liquid in correspondence to the position of the sensor. The novelty of the invention also relates to the machine that includes this device. |
