Endress + Hauser Gmbh + Co. Kg

Endress+hauserse+co. Kg

Erwin Sick Gmbh Optik-Elektronik

Roland Grozinger

Arnd Kempa

Dietmar Spanke

Winfried Mayer

Bernhard Michalski

Klaus Ruf

Qi Chen

Edwin Steinebrunner

Ghislain Daufeld

Stefan Scherr

Andreas Kaiser

Ralf Armbruster

Detlef Ramin

Ottmar Kappeler

Herbert Krickl

Fritz Kuhn

Klauf Ruf

Disclosed is a transmitting device comprising two galvanically isolated sub-circuits. The first sub-circuit comprises: a carrier signal source for outputting a carrier signal; a digital signal source for outputting binary signal levels; and a logic component for performing an AND operation on two input signals. The second sub-circuit comprises: a signal input; a signal output; and a first RC element, the signal input, the signal output and the RC element being connected in parallel to one another with respect to a second reference potential. A first isolating capacitor is connected between the first logic output and the signal input for galvanic isolation. A second isolating capacitor is connected between the first reference potential and the second reference potential for galvanic isolation.

Transmitting device for transmitting digital signals between galvanically isolated circuit parts, and field device having a transmitting device of this type

The invention relates to a method and to a safety circuit for safe limiting of consumption of electrical power in an electrical component of a field device. The consumption of the electrical power is controlled by separating the input path from a superordinated unit by the safety circuit according to a predetermined clocking, wherein the clocking is controlled by a control signal. In the case of no control signal, the power limiting is assured by separating the input path from the superordinated unit. In the case of a defective control signal, the power is limited by the safety circuit to a maximum power. Due to this type of control, the operating temperature of the electrical component remains always below a critical temperature. The field device may thus be used in explosion-endangered regions.

Method and safety circuit for safe limiting of electrical power consumption

A radar-based fill-level measuring device comprising at least one synthesizer circuit having a plurality of circuit components for producing phase controlled microwave signals for a travel-time measurement and at least three electrical potentials for supplying the synthesizer circuit, wherein the synthesizer circuit has at least three circuit groups. Each circuit component is associated with at least one circuit group, wherein each of the at least three circuit groups is fed by means of at least one potential difference between two of the at least three different potentials.

Radar-based fill-level measuring device having a synthesizer circuit

An automation field device having a housing and a modular field device electronics unit located inside the housing. The electronics unit has a first circuit board having at least one first and one second plug-in connector element, wherein the first plug-in connector element is used to electrically connect a peripheral unit, wherein both the first and the second plug-in connector elements can be contacted essentially from the same preferred plug-in direction, and a second circuit board having at least one third plug-in connector element, wherein the circuit boards are arranged such that the second plug-in connector element is connected to the third plug-in connector element in a detachable manner to electrically connect the peripheral unit to the second circuit board, and the second circuit board has at least one opening, via which the first plug-in connector element of the first circuit board is accessible for connecting the peripheral unit.

Automation field device

A time triggered crowbar, which is so embodied that it monitors the on-time of at least one downstream electronic component and the period of clocking and therewith the power supply in such a manner that a predetermined maximum allowable surface temperature of the at least one downstream component is not exceeded in the explosion endangered area.

Electrical or electronic safety circuit

A low noise analog filter with adjustable filter frequency includes an oscillatory circuit, whose resonance frequency equals the filter frequency of the filter. The oscillatory circuit has a first circuit branch. One of the frequency determining elements is a capacitance and the other an inductance. The low noise analog filter further includes an amplifier with adjustable amplification installed in one of the two circuit branches. The output of the amplifier is connected with its inverting input via the frequency determining element arranged in such circuit branch. In filter operation, the amplifier amplifies, according to the adjusted amplification, a voltage applied across the frequency determining element arranged in such circuit branch and thereby effects a corresponding change of an electrical current flowing through such frequency determining element.

Analog filter with adjustable filter frequency

An apparatus for ascertaining and/or monitoring at least one fill-level of at least one medium in a container according to a travel-time measuring method and/or a capacitive measuring method by means of at least one measuring probe. A capacitive measurement circuit, which produces a low frequency measurement signal on the measuring probe, a time-domain reflectometer measurement circuit, which produces a high frequency, electromagnetic signal sent out as a sent signal and a control/evaluation unit, which controls both measurement circuits are included. Also included is a diplexer, which sends the low-frequency measurement signal and the high-frequency, electromagnetic measurement signal to the measuring probe and effects a signal separation of the high-frequency, electromagnetic measurement signal into the first signal path of the time-domain reflectometer measurement circuit and the low-frequency measurement signal into the second signal path of the capacitive measurement circuit.

Apparatus for ascertaining and/or monitoring at least one fill level of at least one medium in a container according to a travel-time measuring method and/or a capacitive measuring method

An apparatus for ascertaining and/or monitoring fill level of a medium, having piezoelectric sensors for producing and receiving ultrasonic signals, relates to a scanning circuit, which provides, for each piezoelectric sensor to be driven, at least one exciter switching circuit for selective driving of the selected piezoelectric sensor.

Device for determining and/or monitoring the filing level of a medium

A sensor system for determining a physical, measured variable, and includes a sensor and a control/evaluation unit, which are spatially separated from one another and electrically conductively connected via a cable having at least two conductors, wherein provided in the sensor are a temperature measuring element for determining temperature and a sensor identifier for sensor identification. The control/evaluation unit drives the temperature measuring element and the sensor identifier via a shared conductor with a positive voltage or a negative voltage, and, depending on the applied voltage, reads a temperature measured value of the temperature element or an identifying value of the sensor identifier.

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Neuenburg, Germany

Roland Grozinger