Patent ID: 7401513

Claim:
Electronic system for detection of the presence of a conducting, or dielectric environment with dielectric constant higher than that of air, having a measuring sensor with capacitor characteristics wherein it consists of a microprocessor control system (US) having in its electrical circuit a capacitor (Cp) electrically connected with the measuring sensor (CP) consisting of an electronic key (K 1 ) and a capacitor (Cx) dependable on the surrounding, conductive or dielectric, environment, connected to said key (K 1 ), wherein a line (Pn) of the control system (US), constituting the charging-current output of the capacitor (Cx) as well as the discharge-current input of the capacitor (Cp), is connected with the key (K 1 ), a line (I/S), constituting the charging-current output of the capacitor (Cp) as well as the input for voltage testing during discharging of the capacitor (Cp), is connected with said capacitor and with key (K 1 ), wherein a line (CEN) of said system, constituting both the charging-current input for capacitor (Cp) and discharge-current output of said capacitor, is also connected through capacitor (Cp) with said key, whereas a common (frame) of the, control system (US) is connected through capacitor (Cx) with key (K 1 ); wherein the electronic system has additional reference sensor (CO) consisting of an electronic key (K 2 ) connected to the line (I/S) of the control system (US) and, connected with said key, a reference capacitor (Cod) with one pole connected to common of said system and, through capacitor (Cx), to the key (K 1 ), whereas a line (Pod) of the control system (US) constituting the charging-current output of the reference capacitor (Cod) as well as the discharge-current input of the capacitor (Cp), is connected with the key (K 2 ) of the reference sensor.