Abstract: Inductive A proximity switch comprising an oscillator 1 and a transmitter coil 2 for generating an alternating magnetic field, a receiving circuit 3 comprising two receiving coils 4 and 5 operating in differential connection for detecting a metallic trigger 6, wherein the receiving coils 4 and 5 are arranged such that they can be influenced differently by the trigger 6 and the induced receiving voltages cancel one another out when the trigger 6 is at a desired switching distance is provided. The coils lie in a common coil former 7 and are completely embedded in the material of the coil former. The receiving coil 4 is arranged in the outer region of the coil former 7. The coil former 7 consists of LTCC ceramic with a coefficient of thermal expansion of less than 10 ppm/K.

Abstract: An admittance meter having an electrical alternating signal source, a diode ring operated as a synchronous rectifier with at least four diodes connected in series and in the same direction in succession, a measuring sensor, and an evaluation unit. The diode ring is subjected to an alternating signal via first second feed points, which are each connected via two series-connected diodes. The measuring sensor is connected to the first feed point, and the evaluation unit is connected to a first or a second measurement point of the diode ring. The first and second measurement points are each connected via one diode to the first and second feed points, respectively.

Abstract: An admittance meter having an electrical alternating signal source, a diode ring operated as a synchronous rectifier with at least four diodes connected in series and in the same direction in succession, a measuring sensor, and an evaluation unit. The diode ring is subjected to an alternating signal via first second feed points, which are each connected via two series-connected diodes. The measuring sensor is connected to the first feed point, and the evaluation unit is connected to a first or a second measurement point of the diode ring. The first and second measurement points are each connected via one diode to the first and second feed points, respectively.

Abstract: A capacitive sensor with at least one reference impedance and at least one measuring condenser (5), with at least one electrical alternating signal source (6), with a current supply network as well as with an analysis unit (7) in which the reference impedance and the measuring condenser (5) are connected via the current supply network to the alternating signal source (6) and the analysis unit (7) in such a way that the charge and discharge currents of the reference impedance and the measuring condenser (5) can be analyzed—at least partially—by the analysis unit (7). The capacitive sensor avoids—at least partially—drawbacks in the known capacitive sensors in that the reference impedance can be tuned.

Abstract: A capacitive sensor with at least one reference impedance (2) and at least one measuring condenser (3), at least one electrical alternating signal source (4), a current supply network (5) and an analysis unit (6) in which the reference impedance (2) and the measuring condenser (3) are connected via the current supply network (5) to the alternating signal source (4) and the analysis unit (6) in such a way that the charge and discharge currents of the reference impedance (2) and the measuring condenser (3) and/or an analysis signal from the analysis unit (6) that characterizes the charge and discharge currents of the reference impedance (2) and the measuring condenser (3) can be analyzed. As a result, the reference impedance (2) can be tuned. The capacitive sensor avoids—at least partially—drawbacks in the capacitive sensors known from the prior art in that the reference impedance can be tuned.

Abstract: A device for measurement and detection of the level of a medium in a container with a sensor element, with a reference element and an electrical circuit which contains at least one AC voltage source and an evaluation unit, the sensor element and the reference element being arranged such that the medium to be measured or detected influences the impedance between them. The capacitive level measurement and detection device has an AC voltage source that supplies a high-frequency voltage or a voltage with high frequency voltage portions. The circuit which has the AC voltage source, the sensor element and the reference element has an impedance which is as low as possible. The electrical circuit can have an amplifier, a timer, a pulse shaper, a first synchronous rectifier, a first I/U converter, a microcontroller, a reference impedance, a second synchronous rectifier and a second I/U converter.

Abstract: A capacitive sensor with at least one reference impedance and at least one measuring condenser (5), with at least one electrical alternating signal source (6), with a current supply network as well as with an analysis unit (7) in which the reference impedance and the measuring condenser (5) are connected via the current supply network to the alternating signal source (6) and the analysis unit (7) in such a way that the charge and discharge currents of the reference impedance and the measuring condenser (5) can be analyzed—at least partially—by the analysis unit (7). The capacitive sensor avoids—at least partially—drawbacks in the known capacitive sensors in that the reference impedance can be tuned.

Abstract: A capacitive sensor with at least one reference impedance (2) and at least one measuring condenser (3), at least one electrical alternating signal source (4), a current supply network (5) and an analysis unit (6) in which the reference impedance (2) and the measuring condenser (3) are connected via the current supply network (5) to the alternating signal source (4) and the analysis unit (6) in such a way that the charge and discharge currents of the reference impedance (2) and the measuring condenser (3) and/or an analysis signal from the analysis unit (6) that characterizes the charge and discharge currents of the reference impedance (2) and the measuring condenser (3) can be analyzed. As a result, the reference impedance (2) can be tuned. The capacitive sensor avoids—at least partially—drawbacks in the capacitive sensors known from the prior art in that the reference impedance can be tuned.

Abstract: A device for measurement and detection of the level of a medium in a container with a sensor element, with a reference element and an electrical circuit which contains at least one AC voltage source and an evaluation unit, the sensor element and the reference element being arranged such that the medium to be measured or detected influences the impedance between them. The capacitive level measurement and detection device has an AC voltage source that supplies a high-frequency voltage or a voltage with high frequency voltage portions. The circuit which has the AC voltage source, the sensor element and the reference element has an impedance which is as low as possible. The electrical circuit can have an amplifier, a timer, a pulse shaper, a first synchronous rectifier, a first I/U converter, a microcontroller, a reference impedance, a second synchronous rectifier and a second I/U converter.

Abstract: A capacitive fill level measurement device with a fill level sensor having a plurality of sensor fields, electrical wires for electrically connecting the plurality of sensor fields to a multipole side of a selector switch, and a power supply and evaluation circuit electrically connected to a monopole side of the selector switch. The capacitive fill level measurement device can be made with simple production technology and thus economically for a host of different applications using a matrix of printed conductors which extend vertically and horizontally such that each horizontally extending printed conductor on one side is connected to one sensor field and on the other side connected to a vertically extending printed conductor. Each horizontally extending printed conductor is connected with a respective vertically extending printed conductor to form an electrical line or a part of an electrical line.

Abstract: A capacitive fill level measuring instrument includes a fill level sensor having several sensor arrays (1), electrical lines (2) connected to the sensor arrays (1), select switches (4) with multi-pole sides (3) connected to the lines (2), and a power supply and evaluation circuit (8) having a power supply circuit (6) and an evaluation circuit (7) connected to the mono-pole sides of the select switches (4). A measured value is determined for a state in which no sensor array (1) is connected via the evaluation circuits (7) and (8), the sensor arrays (1) are alternately connected to the multi-pole side (3) of the first select switch (4) and the multi-pole side (3) of the second select switch (4), and after a first fill level determination, the sensor arrays (1), adjacent to a boundary layer, are triggered or interrogated, advantageously, solving various problems with background art devices.

Abstract: A capacitive fill level measuring instrument includes a fill level sensor having several sensor arrays (1), electrical lines (2) connected to the sensor arrays (1), select switches (4) with multi-pole sides (3) connected to the lines (2), and a power supply and evaluation circuit (8) having a power supply circuit (6) and an evaluation circuit (7) connected to the mono-pole sides of the select switches (4). A measured value is determined for a state in which no sensor array (1) is connected via the evaluation circuits (7) and (8), the sensor arrays (1) are alternately connected to the multi-pole side (3) of the first select switch (4) and the multi-pole side (3) of the second select switch (4), and after a first fill level determination, the sensor arrays (1), adjacent to a boundary layer, are triggered or interrogated, advantageously, solving various problems with background art devices.

Abstract: A capacitive fill level measurement device with a fill level sensor having a plurality of sensor fields, electrical wires for electrically connecting the plurality of sensor fields to a multipole side of a selector switch, and a power supply and evaluation circuit electrically connected to a monopole side of the selector switch. The capacitive fill level measurement device can be made with simple production technology and thus economically for a host of different applications using a matrix of printed conductors which extend vertically and horizontally such that each horizontally extending printed conductor on one side is connected to one sensor field and on the other side connected to a vertically extending printed conductor. Each horizontally extending printed conductor is connected with a respective vertically extending printed conductor to form an electrical line or a part of an electrical line.