Patent ID: 7730780
Filing Date: 2010-06-08
Classification: G01F

Abstract:
1. A level switch for detecting the fill level of a medium in a container and for transmitting a switch signal representative of that level, incorporating a signal generator for generating at least one electromagnetic signal, a measuring circuit as well as a reference circuit into each of which an electromagnetic signal generated by the signal generator can be fed, said measuring circuit being so configured and positioned that the electromagnetic signal fed into the measuring circuit undergoes a change that depends on whether or not the measuring circuit is surrounded by the medium, while the reference circuit is so configured and positioned that the electromagnetic signal fed into the reference circuit remains unaffected by the level of the medium, with a measuring-voltage tap at a specific point on the measuring circuit permitting the determination of the measuring voltage and a reference voltage tap at a specific point on the reference circuit permitting the determination of the reference voltage, and with a voltage comparator serving to compare the measuring voltage with the reference voltage and to emit a comparison-derived switch signal.