Abstract: The present invention relates to a method and device for measuring dielectrics in fluids, such as water. The sensor according to the invention comprises: a first printed circuit board (PCB) having a first side and a second side; a first and second conductor on a side of said first PCB; at least one galvanic connection between the first conductor and the second conductor; a first and second polymer affinity layer on a side of the first PCB; a second and third PCB, being equipped with holes and with a conductor plate; at least one galvanic connection between the first conductor plate and the second conductor plate; at least a first function generator; and a first spectrum analyzer or rectifier, wherein, in use, the sensor is placed in the fluid, and fluid contacts the polymer affinity layer through the holes and wherein impurities in the fluid are selectively absorbed and dispensed in the polymer layers thereby changing the dielectric properties of the polymer affinity layers.

Abstract: The invention relates to an electrical measuring device for performing an electrical impedance measurement in a contactless manner. The measuring device comprises a measuring unit which is provided with the impedance to be measured and a passive resonance circuit connected thereto for generating a measuring signal to be wirelessly received by a separate active transmitting and receiving unit for determination of the electrical impedance, upon wireless reception of an interrogation signal transmitted by the active transmitting and receiving unit. Further, the measuring unit is provided with an additional reference circuit which is preferably connected to the resonance circuit for, depending upon the interrogation signal, generating a reference signal to be received by the active transmitting and receiving unit.