G - Physics – 01 – F
Patent
G - Physics
01
F
G01F 23/28 (2006.01) G01F 23/284 (2006.01)
Patent
CA 2314055
This invention relates to an apparatus for the determination of the fill state of solid or liquid material in a container with a signal-generating/transmitting unit, a receiving unit, a time-delay circuit which transforms the high-frequency signals into low-frequency signals, and an evaluating unit. The invention includes a time-delay circuit having a first circuit element with a time constant r1 driven by input pulses in synchronization with the transmission repetition frequency (f1) and which generates a non-linear output signal, a second circuit element with a time constant (~2) greater than time constant (~1) driven by input pulses with a frequency (f2) which is less than the transmission repetition frequency (f1) and which generates a non-linear output signal, and a third circuit element which detects in each period of the transmission repetition frequency (f1) an intersection of the output signal of the first circuit element and the output signal of the second circuit element and supplies an output signal to an evaluation unit to determine the fill state of the material in the container.
Endress + Hauser Gmbh + Co.
Smart & Biggar
LandOfFree
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