Abb Ag

Thomas Blume

Dieter Keese

Dirk Steckel

The disclosure relates to a circuit arrangement for preventing overloading of magneto-inductive flowmeters. The disclosure can protect the amplifiers which are connected downstream thereof or the electronic evaluation system from overloading. To this end, the signal input circuit is provided with additional voltage-limiting diodes disposed downstream of the impedance converters so that eventual voltage tips are prevented during modulation in the downstream amplifiers of the evaluation electronics.

Preventing an overloading of the electronic evaluation system due to voltage spikes in magneto-inductive flowmeters

Mass flow meter having at least one measurement tube, through which mass flows, as an oscillation body which can be set in mechanical oscillation by means of an excitation unit, the oscillation behavior of which varying as a function of the mass flow can be recorded via at least one oscillation sensor in order to determine the mass flow, wherein in order to eliminate noise signals from the measurement voltage (se) recorded via the oscillation sensor computational technology means are provided for forming a complex conjugate spectrum (|sa|) from the spectrum of the excitation voltage (se) as well as a vector product between this (|sa|) and the measurement voltage (se) for the purpose of filtering, in order, by further computational technology means for inverse Fourier transformation, to obtain the signal relationship associated with the vector product between the excitation voltage (se) and the measurement voltage (se) so that the processed measurement voltage (sa) resulting therefrom then predominantly comprises a useful signal component.

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Halle, Germany

Thomas Blume