Abstract: An electronic device for a level measurement probe for measuring a level of a medium is provided, including: at least one first excitation electronic device configured to emit a first excitation signal; and at least one second excitation electronic device configured to emit a second excitation signal, the first excitation signal and the second excitation signal being different, and the electronic unit being configured to emit the first excitation signal and the second excitation signal simultaneously to the level measurement probe.

Abstract: The invention relates to a measuring arrangement having a two-wire field device comprising a control unit, a sensor, and a radio module, a superordinate unit to which the field device is connected via a two-wire line, wherein signals from the field device are transmitted to the superordinate unit at least as a current injected by the field device in a predetermined range to the superordinate unit, wherein an error current below the predetermined range signals an error, and a maintenance current above the predetermined range signals a maintenance mode, and the field device is designed in such a manner that the maintenance current feeds the radio module in the radio operation.

Abstract: The invention relates to a measuring arrangement having a two-wire field device comprising a control unit, a sensor, and a radio module, a superordinate unit to which the field device is connected via a two-wire line, wherein signals from the field device are transmitted to the superordinate unit at least as a current injected by the field device in a predetermined range to the superordinate unit, wherein an error current below the predetermined range signals an error, and a maintenance current above the predetermined range signals a maintenance mode, and the field device is designed in such a manner that the maintenance current feeds the radio module in the radio operation.

Abstract: Display device, with a plurality of display elements arranged in the shape of a bar, wherein each display element can represent at least one first display state (off) and one second display state (on), and a value being shown can be indicated by the second display state (on) of at least one display element assigned to the value, so that an intermediate value between the value being displayed and a succeeding or preceding value can be represented by activating the preceding or succeeding display element.

Abstract: A bus connection for connecting a field device to a field bus whereby the bus connection has a circuit for sending and receiving databus signals and for generating at least one regulated operating voltage, and the regulated operating voltage is generated from a bus voltage supplying the field bus, characterized in that a controllable resistor is provided for generating an additional operating voltage; circuitry means are provided, controlling the controllable resistor as a function of the bus voltage such that the input voltage of the circuit is regulated at its minimum required power supply voltage; and the sum of the regulated operating voltage and the additional operating voltage is supplied to the field device as the power supply voltage.

Abstract: The subject matter relates to a circuit arrangement for monitoring the function of a fill level measuring apparatus, and particularly of a vibration level switch, including a first piezo-electric vibration device as a transmitting device, a second piezo-electric vibration device as a receiving device, an oscillator circuit, the input and output of which during normal operation are connected to the vibration devices, the second connections of which devices are at common ground potential, and a monitoring circuit for monitoring the function.

Abstract: Display device, with a plurality of display elements arranged in the shape of a bar, wherein each display element can represent at least one first display state (off) and one second display state (on), and a value being shown can be indicated by the second display state (on) of at least one display element assigned to the value, so that an intermediate value between the value being displayed and a succeeding or preceding value can be represented by activating the preceding or succeeding display element.

Abstract: The invention relates to a circuit arrangement for the electrical isolation of signal lines, with an input (IN) for applying an input signal, an output (OUT) for releasing an output signal, and an initial branch (1) with an opto-coupler (OK) for optically coupling the input (TN) to the output (OUT), such that the input (IN) and the output (OUT) are connected in electrically isolated fashion by a second branch (2) with a capacitor (C1).

Abstract: A device for the vibrational detection of a fill-level limit state and a process for the vibrational detection of a fill-level limit state The invention relates to a device for the vibrational detection of a fill-level limit state, and to a corresponding process, with a vibrational resonator (10), at least one piezoelement (11) that is loaded with a piezo-capacitance in order to induce a vibration in the vibrating resonator (10) by providing a drive frequency, and in order to detect a vibration in the vibrating resonator (10); two connecting conductors (12, 13) for the piezoelement (11), and circuit components (18-20) for evaluating a vibration in the vibrating resonator (10) detected by the piezoelement (11), where a branch with a compensating capacitor (2) is connected in parallel to a branch exhibiting the piezoelement (11) in order to compensate a recharging current in the piezoelement (11), which recharging current is dependent on the piezo-capacitance.

Abstract: A bus connection for connecting a field device to a field bus whereby the bus connection has a circuit for sending and receiving databus signals and for generating at least one regulated operating voltage, and the regulated operating voltage is generated from a bus voltage supplying the field bus, characterized in that a controllable resistor is provided for generating an additional operating voltage; circuitry means are provided, controlling the controllable resistor as a function of the bus voltage such that the input voltage of the circuit is regulated at its minimum required power supply voltage; and the sum of the regulated operating voltage and the additional operating voltage is supplied to the field device as the power supply voltage.

Abstract: The invention relates to a vibrating device that is piezo-electrically excited, particularly a fill-level or limit-state measuring device. Its point of departure is a vibrating device that is piezo-electrically excited and that exhibits a membrane (3) which is set into vibration, a piezo-electrical drive device (7) for setting the membrane into vibration or for receiving vibrations from the membrane (3), and a tightening device, such that an initial tightening element (8) belonging to the tightening device is secured to the membrane (3) or is designed to form a single piece with the membrane (3) and such that a second tightening element (9) belonging to the tightening device is so designed that, in interaction with the first tightening element (8), it will brace the drive device (7) against the membrane (3), relative to the first tightening element (8).

Abstract: The invention relates to a circuit arrangement for monitoring the function of a fill level measuring apparatus, and particularly of a vibration level switch, comprising a first piezo-electric vibration device (SP) as a transmitting device, a second piezo-electric vibration device (EP) as a receiving device, an oscillator circuit (O), the input (P0) and output (P4) of which during normal operation are connected to the vibration devices (EP, SP), the second connections of which devices are at common ground potential, and a monitoring circuit for monitoring the function.

Abstract: A filling level sensor comprises a tunable electrical resonant circuit, a mechanical oscillator that can be excited to resonance oscillation by the resonant circuit, and a control circuit for tuning the resonant circuit to a resonance frequency of the mechanical oscillator. A device for comparing the amplitude of the mechanical oscillator with a minimum value ascertains a malfunction of the mechanical oscillator if its amplitude falls below the minimum value.

Abstract: A filling level sensor comprises a tunable electrical resonant circuit, a mechanical oscillator that can be excited to resonance oscillation by the resonant circuit, and a control circuit for tuning the resonant circuit to a resonance frequency of the mechanical oscillator. A device for comparing the amplitude of the mechanical oscillator with a minimum value ascertains a malfunction of the mechanical oscillator if its amplitude falls below the minimum value.

Abstract: A method for rectifying a sensor current with a synchronous demodulator, wherein the rectifying factor of the synchronous demodulator can be controlled. A control clock pulse signal of the synchronous demodulator is toggled between at least two different states, with the states corresponding to different rectifying factors. The resulting total rectifying factor of the synchronous demodulator can be selected at will by adjusting the pulse duty factor between the at least two states.