Abstract: An inductive conductivity sensor and a method for measuring specific electrical conductivity of a medium, comprising a transmitting coil fed by means of an input signal; coupled with the transmitting coil via the medium; a receiving coil, which delivers an output signal, which is a measure for the conductivity of the medium; and surrounding the transmitting coil and the receiving coil a housing, which has, intended for immersion in the medium, at least one housing section, whose housing wall surrounds the transmitting coil and the receiving coil. The housing section includes at least a first electrically conductive contact intended for contact with the medium and a second electrically conductive contact intended for contact with the medium.

Abstract: A two-part sensor composed of a sensor head and a sensor-head counterpart, testing is performed as to whether a correct sensor head is connected with the sensor-head counterpart.

Abstract: A method and a sensor for ascertaining at least one malfunction of a conductive conductivity sensor having at least two electrodes applying a first electrical variable to the electrodes measuring at least a second electrical variable on the electrodes and deciding whether a malfunction is present based on measuring the second electrical variable. The second electrical variable is located in a first range when measuring the medium when no malfunction is present, and the second electrical variable is located in a second range in the case of a first malfunction, especially when the conductivity sensor is located at least partially outside of the medium, and the second electrical variable is located in a third range when a second malfunction is present, especially an electrode break or a break in a line to the electrodes.

Abstract: An electronic circuit for transmitting an ASK signal, wherein the ASK signal transmits data and energy between a first side having a first interface, and a second side having a second interface corresponding to the first interface. The first interface and the second interface are embodied for transmitting data and energy, and the first interface and the second interface are embodied as galvanically separated interfaces, comprising a converting apparatus for transforming data, especially a digital data signal, into an analog wanted signal; a carrier source for producing a carrier signal having a carrier frequency; a resonator circuit for merging the carrier signal with the wanted signal to form the ASK signal with an amplitude. The resonator circuit is so embodied that it is excited by the carrier signal to execute periodic oscillations, wherein the ASK signal includes the wanted signal and the periodic oscillations, and wherein essentially the wanted signal determines the amplitude of the ASK signal.

Abstract: A method for adjusting, calibrating and/or checking a function of a photometric sensor, which is embodied for measuring at least one measured variable in a medium, wherein the sensor works with at least one measuring wavelength and at least one reference wavelength, comprising the steps as follows: mounting a calibration insert in a receptacle provided therefor at the sensor, adjusting, calibrating and/or performing the function check, and removing the calibration insert, characterized in that the transmittance of light of the measuring wavelength and the transmittance of light of the reference wavelength through the calibration insert are different. The invention relates further to a calibration insert.

Abstract: A cable circuit includes a contactless interface for signal transmission between the cable circuit and the sensor module, wherein the sensor module is galvanically isolated from the cable circuit, and wherein signal transmission between the cable circuit and the sensor module occurs on an optical, inductive or capacitive path. Additionally, the cable circuit includes a signal processing unit, as well as a cable interface for connecting a cable, which connects the cable circuit with the measurement transmitter. The signal processing unit is integrated into the signal path. The signal processing unit is embodied to receive, via the cable interface, signals from the measurement transmitter, to condition them and to transmit them via the contactless interface to the sensor module, and to receive, via the contactless interface, signals from the sensor module, to condition them and to transmit them via the cable interface to the measurement transmitter.

Abstract: A measuring arrangement for registering a measured variable representing concentration of an analyte in a measured medium, includes: a first electrode modified with a redox active substance, a second electrode, and a measuring circuit, which comprises a voltage source for applying at least one predetermined voltage between the first electrode and a reference, and an apparatus for registering electrical current flowing, in such case, between the first electrode and the second electrode or for registering a variable correlated with the electrical current flowing between the first electrode and the second electrode, wherein the second electrode is modified with the same redox active substance as the first electrode.

Abstract: A retractable assembly and a sealing system, the sealing system comprising: an essentially hollow, cylindrical housing with an inner space and a peripheral groove open to the inner space in the housing. The peripheral groove defines a plane in the housing and the normal of the plane is parallel to the longitudinal axis of the housing. The groove includes at least one, preferably two, extension spaces expanding the groove. The extension space is arranged on the side of the groove facing away from the inner space. An annular seal corresponding to the groove is arranged in the groove. The annular seal is formed of at least a first section facing the inner space and a second section facing away from the inner space.

Abstract: A probe system, including: a connector apparatus; a treatment chamber part having at least one treatment medium supply line communicating with the treatment chamber; a measuring head seated so as to be axially shiftable, and a treatment position, wherein the immersion tube, on its connector apparatus-side front end, has a front-end closed, protective cylinder, and is arranged in a section of the immersion tube, so that, in the measuring position of the immersion tube, the measuring head is contactable via perforations with the process medium, and in the treatment position of the immersion tube, is contactable with the treatment medium; and a drive system for axial shifting of the immersion tube, arranged on the end region of the probe system facing away from the connector apparatus. The treatment chamber part is surrounded by a support structure connected with the connector apparatus and with the drive system.

Abstract: A retractable assembly for immersion-, flow- or add-on measuring systems in analytical process technology for measuring at least one measured variable of a medium in a containment, comprising: an essentially cylindrical housing; an immersion tube, which is movable axially in the housing between a service position out of the medium and a process position in the medium; and a sensor for measuring the measured variable. The sensor is arranged in the immersion tube, wherein the sensor protrudes at least sectionally out of the immersion tube at the end of the immersion tube remote from the medium; and an openable and closable cover, which surrounds at least the section of the sensor protruding out of the immersion tube. The sensor in the opened state of the cover is mountable and demountable, respectively, in and from the immersion tube.

Abstract: A potentiometric sensor includes a housing, in which a reference half cell space and a separated, measuring half cell space are formed. The reference half cell space contains a reference electrolyte and at least one part of a first potential sensing electrode for sensing a reference potential, and the measuring half cell space is liquid-tightly sealed by a measuring membrane, and contains an inner electrolyte and at least one part of a second potential sensing electrode for sensing a measuring half cell potential. A passageway extends through a wall of the housing, and opens into the reference half cell space, and is sealed relative to a medium surrounding the housing. The potentiometric sensor has a way for producing through the passageway an electrolytic contact between the reference electrolyte and the medium surrounding the housing.

Abstract: In a method and apparatus for determining information concerning the presence of ingredients with oxygen demand in a liquid sample, especially for determining the chemical oxygen demand of a liquid sample, especially a water, or wastewater, sample, by means of electrochemical oxidation of ingredients of the liquid sample, oxidation of ingredients of the liquid sample occurs on a boron doped, diamond electrode.

Abstract: A measuring transducer, which is embodied to produce and output a measurement signal dependent on the content of H+ and/or OH? ions present in a measured medium, wherein the measuring transducer has, in a region provided for contact with the measured medium, at least one polymer membrane selectively conducting H+ and/or OH? ions. The polymer membrane can comprise an H+ ion conducting polymer and/or an OH? ion conducting polymer.

Abstract: A retractable assembly for immersion-, flow- and annex-measuring systems in analytical process technology for measuring at least one measured variable of a medium in a process containment, comprising an essentially cylindrical housing having a housing interior; an immersion tube, which is axially movable between a retracted service position in the housing and a process position extended from the housing. In the service position, the immersion tube is positioned in the housing interior; a closure element on an end region of the immersion tube facing the medium for sealing off the housing interior from the process containment when the immersion tube is located in the service position, and a proximity detector in or on the end region of the housing facing the medium for detecting the closure element in the service position.

Abstract: A turbidity sensor or an arrangement for optically measuring one or more physical, chemical and/or biological, process variables of a medium. The medium is located in a pipe. The arrangement includes a housing and the housing is embodied for securement in the pipe. The housing is embodied for accommodating at least one light source for sending light through a window region into the medium and at least one light receiver for receiving light through the window region from the medium. The light is scattered by the medium and the light intensity received by the light receiver is a measure for the physical, chemical and/or biological, process variable, characterized in that the light source is so arranged that the light propagates in the medium in the longitudinal direction of the pipe.

Abstract: A probe arrangement, in the case of which a probe is arranged within a tubular housing, wherein the tubular housing has at least one process window open to the process medium, and at least one functional element is secured on the probe and surrounded by the process medium. In order to suppress a taking along of the process medium during transfer of the functional element from the measured medium into a rinsing chamber, the tubular housing includes at least one treatment window open opposite the probe (3), preferably for washing, rinsing and/or calibrating the functional element, wherein the functional element is movable between the process window and the treatment window, and, during the measuring in the process medium, the at least one functional element is arranged approximately coincident with the at least one process window of the housing.

Abstract: A method for operating a sensor in a multisensor system, especially in a field device in the form of a measuring device for process automation technology, wherein data output from the sensor are evaluated by the measuring device connected with the sensor and the measuring device supplies the sensor with energy. In order reliably to limit production of lost heat in a measuring device to a certain value and, in spite of this, to be able to connect a number of sensors with different energy requirements to a measuring device, before a startup of the sensor, it is checked whether, with startup of the sensor, a maximum consumption of electrical energy of the measuring device would be exceeded.

Abstract: A sensor for registering analyte concentration includes: a housing; arranged within the housing, a sensor element, which has a front surface pressed toward a housing wall of the housing, and the sensor element has at least one contact element for electrical contacting accommodated within the housing, an inner electrolyte, which is in contact with a medium surrounding the housing via an electrochemical, liquid junction arranged in a housing wall, and a reference electrode extending into the inner electrolyte, wherein there is arranged within the housing a flexible circuit card, which includes at least a first conductive trace, which is connected with the at least one contact element of the sensor element, and at least a second conductive trace, which serves as potential sensing element of the reference electrode.

Abstract: A gradiometer for determining electrical conductivity of a medium contained in a containment, comprising: at least a first electrical coil, a second electrical coil and a third electrical coil, wherein the first coil is embodied as a transmitting coil, wherein the second and third coil are embodied as receiving coils; and a holding apparatus. The first, second and third coils are wound on the holding apparatus. The holding apparatus is arranged through a containment opening in a containment wall in such a manner that the first coil is positioned centrally with respect to the containment wall. The second and third coils are arranged mirror symmetrically to the first coil and are inductively coupled with the first coil.