Self-diagnosis of a vibrating level gauge

Details Self-diagnosis of a vibrating level gauge Self-diagnosis of a vibrating level gauge

2007-08-28

2007-08-28

Williams, Hezron (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Liquid level or volume measuring apparatus

C073S29000R

Reexamination Certificate

active

11193950

ABSTRACT:
Described is a method for detecting and/or for monitoring the level of a medium stored in a vessel and in particular to a method for diagnosing the functionality of the electromechanical oscillation unit of a vibration level gauge. An electromechanical transducer of the electromechanical oscillation unit of a vibration level gauge is supplied with an electric wave signal. The frequency of which is beyond the resonance frequency range of the electromechanical oscillation unit and is thus not adapted to actuate the oscillatory portion as for example an oscillating rod probe or tuning fork, so that the electric wave signal is converted into mechanical oscillations without actuating the oscillatory portion. Subsequently, the converted mechanical oscillations will be recorded using the at least one electromechanical transducer of the electromechanical oscillation unit, which reconverts the mechanical oscillations into an electric wave signal. These recorded electric wave signals will then be analyzed to derive therefrom any transmission characteristics of the electromechanical transducer by comparing at least one of the signal characteristics of the reconverted electric wave signal with typical signal characteristics determined before. Finally, a status information will be edited subject to the analysis of the transmission characteristics.

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