A device for sensing the electrical conductivity of liquids, in particular the electrical conductivity of washing machines

摘要

The electric conductivity detecting device 1 includes an electrically insulating supporting casing 2 in which first and second electrodes A and B which are brought into contact with a washing tub through an electrically insulating supporting casing 2 extend outward , Electrically insulated supporting casing (2); A power supply and signal acquisition and processing circuit device (4), at least partially housed in said electrically insulating support casing (2) and connected to said electrodes (A, B) Devices (4); And a signal coupling and galvanic isolation means interposed between the power supply and signal acquisition and processing circuit devices 4 and the electrodes A and B, Wherein the signal coupling and galvanic isolation means comprise at least a first and a second capacitor (C), each of the first and second capacitors (C) Are interconnected in series between one of the electrodes (A, B) and the corresponding terminal (9, 10) of the power supply and signal acquisition and processing circuit devices (4).