Abstract: 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.

Abstract: 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.

Abstract: A method and device for obtaining an interference free measurement from a flowmeter. The flowmeter includes a measuring tube through which a flowable medium flows through a magnetic field generated by a magnetic arrangement and at least two measuring electrodes for detecting the measurement voltage induced by the flowable medium. The medium gives rise to interference voltages. The electrodes are connected to an interference-voltage eliminating unit by which common-mode interference is first eliminated by differentiation and unequal interference voltages are subsequently eliminated.

Abstract: A method and device for detecting physical-chemical states on measuring electrodes (4a, 4b) of a flowmeter, through the measuring tube (1) of which a flowable medium (2) flows which, in doing so, passes through a magnetic field generated by a magnetic arrangement (3), wherein, for detecting the measurement voltage induced by the flowable medium (2), at least two measuring electrodes (4a, 4b), which are connected to a following interference-voltage eliminating unit (6) by which common-mode interference is first eliminated by differentiation, are arranged at the measuring tube (1), wherein unequal interference voltages are subsequently eliminated by the interference-voltage eliminating unit (6) in that, in operation, the current voltage value U+(n) and U?(n) of each individual measuring electrode (4a; 4b) is compared with the associated preceding voltage value U+(n?1) and U?(n?1), a measurement being released for further signal processing only when as a result of the comparison, an equal, essentially proportion