Abstract: A magnetoinductive flowmeter for moving fluids incorporates a measuring tube; an electromagnet including a field coil and serving to generate a magnetic field that extends at least essentially perpendicular to the axis of the measuring tube; a power supply serving to feed a switched-DC field current to the field coil; two measuring electrodes positioned along a connecting line that extends at least essentially perpendicular to the axis of the measuring tube and to the direction of the magnetic field; and a detection circuit serving to analyze the measuring voltage of the measuring electrodes and to generate a flow signal; as well as a current regulator controlling the field current and a control circuit controlling or regulating the voltage at the field coil of the electromagnet; as well as a changeover bridge connected to the input of the field coil of the electromagnet.

Abstract: The circuit arrangement for measured value detection, transfer and analysis, with a measured value detection section (1), a measured value analyzing section (2) and a connection (5) consisting only of an outgoing conductor (3) and a return conductor (4) between the measured value detection section (1) and the measured value analyzing section (2), in connection with which the measured value detection section (1) has a measured value recorder (6), a measuring transformer circuit (7), a switch controller (8) connected upstream from the measuring transformer circuit (7) and a current regulator (9) connected upstream from the switch controller (8), in connection with which the measured value analyzing section (2) has a voltage source (10) and an analyzing circuit (11), and the switch controller (8) delivers a constant operating voltage for the measuring transformer circuit (7), and the current regulator (9)—controlled by the measuring transformer circuit (7)—sets a measured value and power supply curre

Abstract: Method and apparatus for converting an analog input voltage signal (preferably in the form of a low-frequency rectangular voltage) to a digital output signal proportional to the input voltage. The input voltage is integrated to the integrator voltage over a certain integration time. After the expiration of the integration time, the integrator voltage is de-integrated to zero over a de-integration time by a reference voltage and the input voltage is found from the ratio of de-integration time to integration time, multiplied by the reference voltage. During the integration time, modulation pulses, preferably derived from the reference voltage, are superimposed on the input voltage and thus the integrator voltage is influenced, so that a given integrator voltage is obtained regardless of the input voltage.