Device for detecting frost formation and for eliminating it by heating, particularly for domestic refrigerator evaporators

摘要

The device measures and monitors the extent of frost formed on the evaporator (4) and provides for its defrosting only when necessary. For this purpose there are provided flat resistive elements (A,B) applied to an electrically insulating flexible substrate (1). The resistive elements (A,B) are positioned spaced apart beside each other so as to form the plates of a capacitor. Contactors (6,7) are provided enabling the resistive elements (A,B) to be converted into the plates of a capacitor, which is powered by an oscillator.