Abstract: A monitoring device for a system for measuring process variables, in particular in liquid analysis, which measuring system comprises a sensor (2) for recording a process variable and a contactless, inductive plug-in connection (5) between the sensor (2) and a cable (6) for preferably bidirectional transfer of digital signals between the sensor (2) and a remote transducer (7), the monitoring system comprising: a coupling device (17) that can be placed on the plug-in connection (5) and operates without contact to record the signals transferred via the plug-in connection (5), an evaluation device (21) for evaluating the recorded signals, and a display device (22) for presenting the evaluated signals.

Abstract: A transducer for high-voltage measuring technology, including a housing having a parallelepipedal basic contour, input connections arranged on the housing and carrying input measurement signals in the high-voltage range, output connections arranged on the housing and carrying output signals in the low-voltage range, a transducer circuit arranged in the housing and implemented on a printed circuit board and being contact-connected to the input and output connections. The parallelepipedal basic contour of the housing is designed as an upright construction. The printed circuit board is arranged upright between opposite side walls of a dome formed in the housing. The input connections are arranged facing away from one another on the outer sides of the side walls within the basic contour of the housing, and in a manner engaging through the respective side wall of the dome are in contact with contact elements of the transducer circuit on the printed circuit board.

Abstract: A signal transmission device for pulse density modulated signals comprises a signal input for an input signal with a defined maximum signal value, a modulation stage for generating a pulse density modulated transmission signal out of the input signal, a locking device at the input for the pulse density modulated transmission signal to overwrite same with a static fault signal, a pulse reconstructing transmission path for the pulse density modulated transmission signal, a demodulation stage at the output, for reconstructing the input signal out of the transmitted pulse density modulated transmission signal, and a signal change monitoring device capturing the pulse density modulated transmission signal of the transmission path at the output, which has an error signal output for signaling the detection of a missing dynamic pulse density modulated transmission signal on the transmission path due to the static fault signal.

Abstract: An isolation amplifier includes an input circuit at high voltage potential with an input for a measurement signal to be transmitted, an input circuit configuration providing a coupling section signal representing the measurement signal, and a high-voltage-side control unit for driving the input circuit, a galvanically isolating coupling section for the potential-free transmission of the coupling section signal to an output circuit at low-voltage potential with an output circuit configuration for generating an output signal from the transmitted coupling section signal, an output for the output signal and at least one low-voltage-side control unit for generating control signals, input elements for inputting control commands and/or parameters into the high-voltage-side control unit, a low-voltage-side arrangement of all the input elements provided for the parameterization of the high-voltage-side control unit, exclusively in a low-voltage circuit, and a galvanically isolating control channel for transmitting the

Abstract: An electrochemical sensor for measuring the oxygen partial pressure in a process fluid, comprises an electrolyte-filled sensor body, which is covered on one side charged with the process fluid by an oxygen-permeable membrane, a cathode on the membrane, an annular guard electrode surrounding the cathode, which in measuring operation lies at the same potential as the cathode, an anode charged by the electrolyte in the sensor body, a reference electrode charged by the electrolyte in the sensor body, wherein between the anode and cathode a voltage can be applied, which is controlled between the cathode (8) and reference electrode at a constant polarization voltage and the measuring sensor current flowing in measuring operation between the cathode and anode is a measure for the oxygen partial pressure in the process fluid, and a test voltage source which can be switched in a testing mode between the cathode and guard electrode for producing test oxygen in the electrolyte and/or in the process fluid between the

Abstract: A connection system for the preferably contactless transmission of data and power supply signals between a sensor means and a base unit in a measuring and transmission system comprises a sensor-side and a base-side connection element. There is provided in at least one of the connection elements an optical diagnosis display unit for displaying state parameters within the measuring and transmission system.

Abstract: A connection system for the preferably contactless transmission of data and power supply signals between a sensor means and a base unit in a measuring and transmission system comprises a sensor-side and a base-side connection element. An input unit is provided on at least one of the connection elements for inputting sensor-relevant commands.