Method and monitoring system for closing covers

A system for detecting the approach of vital objects toward moved components that are movable as such within a control range, comprising:

• a transmission electrode structure for transmitting a spatially extended excitation field,
• a LC network connected to the transmission electrode,
• a first oscillator and a reference oscillator;
• a mixer coupled with the reference oscillator;
• a first switch for coupling the first oscillator with the LC network or with the mixer;
• a receiving electrode structure to receive a field-electrical effect within a receiving area extending along the receiving electrode structure which is configured to be coupled with the first oscillator to determine the frequency of the first oscillator;
• first and second shield electrodes coupled with the LC network;
• and
• an evaluation circuit coupled with an output of the mixer for evaluating the operation of first oscillator and for generating an evaluation result based thereon;
• wherein the transmission electrode structure and the a receiving electrode structure are provided near each other, and the receiving electrode structure and the transmission electrode structure are shielded by said first and second shield electrode from each other such that when the excitation field and the receiving area are bridged by an object to be detected, a voltage event that can be classified as indicating a presence is induced in the receiving electrode structure.