In the case of devices with contactless conductivity cells, the electrodes are located on the outer wall of the cell, they were the armatures of a capacitor that is part of an oscillating circuit
whose frequency is an expression of the dielectric conductivity (analyzed water).
Key words: electromagnetic rooms shielding, short-circuit turns, passive oscillating circuit
Passive LC oscillating circuit are the basic constructive elements in this case (Figure 4), made from thin sheets of aluminum foil glued to a polyethylene support figure 2, bands that are embedded during the manufacturing process within building material type of gypsum boards, fiber boards, plastic-faced hardboards, etc.
A way to achieve an oscillating circuit bands, which have different resonant frequency given to the specific frequency values existing in the environment is the use of the aluminum foil glued on a thin polyethylene strips.
Oscillating circuits and metal cage coils are invisibly embedded in various building or ornamental materials of spaces and uses the radiant energy from the outside by the resonant oscillation, turning it in heat and protecting living spaces effect of high frequency electromagnetic radiations.
A special solution is to fit such a kind of oscillating circuits, figure 2 (see detail B1-fig.