Vega Grieshaber Kg

Adrian Frick

Felix Raffalt

Ingo Harter

The invention pertains to a level measuring by an apparatus has oscillating fork ( ) that is excited to oscillate by an oscillator circuit that, for example, is realized in the form of a series circuit consisting of an input amplifier ( ), a band filter ( ) and an output amplifier ( ). An identifying element ( ) is assigned to the oscillating fork ( ), with the identifying element transmitting the fundamental frequency of the oscillating fork ( ) to the oscillator circuit ( ) in coded form. In addition, the identifying element ( ) transmits the fundamental frequency of the oscillating fork ( ) to the control input of a frequency evaluation circuit ( ), the input of which is connected to the output of the oscillator circuit ( ). Consequently, the parameters of the band filter ( ), as well as of the frequency evaluation circuit ( ), are optimally adjusted to the fundamental frequency of the oscillating fork ( ).

Method and arrangement for level measuring

A method for controlling a transducer device ( ) featuring supply lines ( ) in a level sensor. The transducer device ( ) is coupled to a fork resonator with fork tines and is used for both oscillation excitation and also for oscillation detection. For detection of a defective transducer device or an incorrectly connected connection of this transducer device ( ), the capacitance value between the supply lines ( ) or a variable proportional to this value is determined during the oscillation excitation and if there is deviation from a predetermined desired value by a predetermined amount, a fault signal is generated.

Method for controlling a transducer device in level sensors and device for carrying out such a method

An oscillating element, particularly for a level sensor, comprises an oscillating diaphragm ( ), a stack of piezoelectric elements ( ), and a tie bolt ( ) connected to the diaphragm ( ) for pressing the piezoelectric elements ( ) against the diaphragm ( ). The tie bolt ( ) forms a single piece with the diaphragm ( ).

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Wolfach, Germany

Adrian Frick