Abstract: A sensor (1) comprising a membrane, an isolation layer (3) arranged on the membrane, measuring electronics comprising a thin film circuit (4), e.g. in the form of a Wheatstone bridge, deposited on the isolation layer (3), and a power supply (14) arranged to supply a quasi-DC voltage to the thin film circuit (4) is disclosed. The sensor (1) is cost effective to manufacture, due to the thin film circuit (4), and corrosion effects are avoided, without having to apply a coating or passivation layer onto the thin film circuit (4), due to the quasi-DC voltage being supplied to the thin film circuit (4).

Abstract: A sensor (1) comprising a membrane, an isolation layer (3) arranged on the membrane, measuring electronics comprising a thin film circuit (4), e.g. in the form of a Wheatstone bridge, deposited on the isolation layer (3), and a power supply (14) arranged to supply a quasi-DC voltage to the thin film circuit (4) is disclosed. The sensor (1) is cost effective to manufacture, due to the thin film circuit (4), and corrosion effects are avoided, without having to apply a coating or passivation layer onto the thin film circuit (4), due to the quasi-DC voltage being supplied to the thin film circuit (4).

Abstract: A field device for process instrumentation comprising a measurement transducer having an analog output to which a two-wire line can be connected for transmitting an analog output signal, wherein a unit galvanically separates the processor from an analog output circuit. A read-back channel for a pulse-width modulated digital signal, which is tapped behind an element for galvanic separation, is provided for monitoring generation of the analog output signal, and a unit is provided for monitoring the analog output signal to maintain a specifiable maximum deviation from a reference signal, which is generated in the same manner as the analog output signal by low-pass filtering from the pulse-width modulated digital signal. In the case of transient signals, the monitoring unit advantageously detects error states quickly and appropriate measures for reacting to the error states can therefore be implemented in less time.

Abstract: A sensor (1) comprising an n-dosed/p-dosed substrate (2), and a Wheatstone bridge (3) arranged on the substrate (2) is disclosed. A field shield (4) is arranged on the substrate (2) in such a manner that the field shield (4) covers the Wheatstone bridge (3). A quasi-DC voltage is supplied to the Wheatstone bridge (3), and a DC voltage is supplied to the substrate (2), the level of said DC voltage being higher/lower than or equal to the quasi-DC voltage supplied to the Wheatstone bridge (3). A voltage may be supplied to the field shield (4), the level of said voltage being higher/lower than or equal to the quasi-DC voltage supplied to the Wheatstone bridge (3).

Abstract: A system and method for corrosion protection of measuring electrodes in electromagnetic flowmeters, wherein a respective constant direct current is generated by a current source for first and second metallic measuring electrodes provided on opposite sides of a measuring tube, and the constant direct current is passed from the current source to the first and second metallic measuring electrodes, where the constant direct current passed to each metallic measuring electrode is established to lower the electrode potential of a respective measuring electrode with respect to the medium below a threshold value to render the respective metallic measuring electrode immune to corrosion with respect to a medium.

Abstract: An electromagnetic flowmeter for measuring the flow of a medium through a measuring pipe, wherein the flowmeter includes first and second electrodes arranged on opposite sides of the measuring pipe and coupled electrically or capacitively to the medium. A common mode test signal is passed to the first and second electrodes. A third electrode is provided at the top of the measuring pipe for receiving a response signal in response to the test signal passed to the first and second electrodes. The flowmeter also includes a detection device for detecting whether the third electrode is in contact with the medium based on the response signal.

Abstract: A field device for process instrumentation comprising a measurement transducer having an analog output to which a two-wire line can be connected for transmitting an analog output signal, wherein a unit galvanically separates the processor from an analog output circuit. A read-back channel for a pulse-width modulated digital signal, which is tapped behind an element for galvanic separation, is provided for monitoring generation of the analog output signal, and a unit is provided for monitoring the analog output signal to maintain a specifiable maximum deviation from a reference signal, which is generated in the same manner as the analog output signal by low-pass filtering from the pulse-width modulated digital signal. In the case of transient signals, the monitoring unit advantageously detects error states quickly and appropriate measures for reacting to the error states can therefore be implemented in less time.

Abstract: A measuring transducer has a sensor for recording a physical or chemical parameter and for generating a corresponding measurement signal and has an analytical device for determining a measured value dependent on the measurement signal and for outputting the measured value. A first interface for digital transmission of the measured value and a second interface are provided between the sensor and the analytical device. The analytical device is provided with a signal by the second interface, providing the measurement signal from the sensor. A synchronization of the analytical device t to the sampling time of the sensor is thus possible.

Abstract: A system and method for corrosion protection of measuring electrodes in electromagnetic flowmeters, wherein an electromagnetic flowmeter for measuring the flow of a medium through a measuring tube comprises first and second metallic measuring electrodes arranged on opposite sides of the measuring tube and in contact with the medium. The rate of flow of the medium in the measuring tube is measurable by output signals from the measuring electrodes representative of a potential difference between the measuring electrodes induced by the flow of the medium in the measuring tube in the presence of a magnetic field.

Abstract: An electromagnetic flowmeter for measuring the flow of a medium through a measuring pipe, wherein the flowmeter includes first and second electrodes arranged on opposite sides of the measuring pipe and coupled electrically or capacitively to the medium. A common mode test signal is passed to the first and second electrodes. A third electrode is provided at the top of the measuring pipe for receiving a response signal in response to the test signal passed to the first and second electrodes. The flowmeter also includes a detection device for detecting whether the third electrode is in contact with the medium based on the response signal.

Abstract: A measuring transducer has a sensor for recording a physical or chemical parameter and for generating a corresponding measurement signal and has an analytical device for determining a measured value dependent on the measurement signal and for outputting the measured value. A first interface for digital transmission of the measured value and a second interface are provided between the sensor and the analytical device. The analytical device is provided with a signal by the second interface, providing the measurement signal from the sensor. A synchronization of the analytical device t to the sampling time of the sensor is thus possible.