Apparatus for determining and/or monitoring at least one process variable of a medium
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United States of America Patent
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Jan 27, 2016
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Feb 10, 2015
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An apparatus for determining and/or monitoring at least a first process variable of a medium and method for operating the apparatus at least with an electronics unit and a sensor unit, wherein the electronics unit is embodied to supply the sensor unit with an excitation signal, which is composed of an excitation carrier signal with an excitation carrier frequency and an excitation modulation signal with an excitation modulation frequency, and to receive from the sensor unit a received signal, which is composed of a received carrier signal and a received modulation signal, and wherein the electronics unit is embodied to determine from the phase shift between the excitation modulation signal and the received modulation signal at least the first process variable.
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