Resumen
The electronic magnetic device for the control of perimetric protection systems is based on the non-mechanism LVDT (linear voltage differential transformer) to detect the mechanical tension of a security fence. The sensor element is comprised of two parts: a core of magnetic materials on which is wound a copper winding through which a low intensity current is circulated and a tube of plastic material to which are wound two copper windings mounted in series and opposition. The core is placed inside the post and the plastic tube is fixed by means of another support to the fence wires. The function of the sensor is to detect the signal variation which is produced when the sensor part which is integral with the wire moves with respect to the sensor part which is fixed to the post. This signal variation is processed electronically and, through the corresponding communication, an alarm is activated.