Abstract: Disclosed is a digital pH sensor for measuring the pH, comprising an electronics unit, sensor housing having a first half-cell and a second half-cell adapted to form a potential difference between the first electrode and the second electrode if the digital pH sensor is in contact with a measurement medium, wherein the electronics unit is adapted for converting the potential difference into a digital voltage value or a digital pH value, wherein the first electrolyte, the first electrode, the second electrolyte, and/or the second electrode are selected such that, at a pH value of 7 and a temperature of 25° C. in the measurement medium, the potential difference of the two electrodes is not equal to 0 mV, and wherein the electronics unit converts the potential difference into the digital measured pH value of 7 or a digital measured voltage value of 0 mV.

Abstract: A measuring apparatus for determining at least one measurand of a measuring medium includes a first measuring device including a first measuring sensor structured to contact the measuring medium and configured to detect measured values of the at least one measurand, the first measuring device embodied to determine a first measured value that is dependent on the at least one measurand of the measuring medium, a sampling device structured to remove a sample from the measuring medium, a second measuring device including a second measuring sensor and embodied to determine a second measured value that is dependent on the least one measurand of the sample, and an electronic control apparatus configured to receive and process the first and second measured value and to perform a verification, calibration and/or adjustment of the first measuring device using the second measured value.

Abstract: The present disclosure relates to a sensor element for a potentiometric sensor, comprising a substrate formed from a metal alloy and an ion-selective enamel layer arranged on the substrate, wherein the metal alloy comprises at least one transition metal and wherein the ion-selective enamel layer contains a proportion of an oxide of the transition metal, and wherein an electrically conductive transition zone is arranged between the substrate and the enamel layer and contains the transition metal in a plurality of different oxidation states.

Abstract: An automatic sampling apparatus for taking liquid samples for the qualitative or quantitative determination of at least one analyte contained in the sample liquid includes a sample line that can be fluidically connected to the sampling station, a pump device, at least one sample container that can be fluidically connected to the sample line, and an electronic control system. The electronic control system is configured to fluidically connect the sample line to the sample container such that a fluid flow path extending from the sampling station through the sample line into the sample container is formed. The electronic control system is further configured to transport, using the pump device, a definable volume of the sample liquid, in the form of a liquid sample, along the fluid flow path into the sample container. The sampling apparatus is configured for concentrating or extracting the analyte present in the liquid sample.

Abstract: The present disclosure relates to a potentiometric probe for measuring a measured variable that represents an ion concentration in a measuring medium, including a probe base including a sensor circuit, and two electrochemical half-cells arranged such that one of the half-cells surrounds at least one portion of the other half-cell, wherein at least one of the half-cells is configured as a module which is connected to the probe base via a mechanical and electrical interface. In another embodiment, one of the half-cells is a measuring half-cell including an ion-selective membrane and a terminal lead which electrically contacts the ion-selective membrane. The other half-cell is a reference half-cell, wherein the measuring half-cell and/or the reference half-cell are each configured as a module which is connected to the probe base via a mechanical and electrical interface.

Abstract: The present disclosure relates to an electrochemical sensor for determining a measurand correlating with a concentration of an analyte in a measuring fluid, comprising: a sensor membrane designed to be in contact with the measuring fluid for detecting measured values of the measurand; a probe housing which has at least one immersion region designed for immersion into the measuring fluid, wherein the sensor membrane is arranged in the immersion region of the probe housing; and a measurement circuit which is at least partially contained in the probe housing and is designed to generate and output a measurement signal dependent on the measurand, wherein the sensor membrane contains an optically detectable substance for marking the sensor membrane.

Abstract: According to at least one aspect of the present disclosure, a method includes applying an alternating current having a frequency at a selected voltage to a sensor, wherein the voltage is applied between a reference electrode and a working electrode of the sensor, varying the frequency of the alternating current between a lower frequency and an upper frequency, measuring an impedance of the sensor between the reference electrode and the working electrode as a function of the frequency of the alternating current, analyzing the measured impedance to determine a total impedance of the sensor and the real and imaginary components of the total impedance at each applied frequency of the alternating current, and characterizing the sensor based on the total impedance at the low frequency end of the sensor and on the real and imaginary components of the total impedances.

Abstract: A sensor arrangement includes a storage chamber comprising an interior space, containing a liquid, with an opening, a reference terminal lead which contacts liquid and can be connected to a superordinate unit, and a sensor tube comprising a sensitive region for detecting a measured quantity of the measuring medium and a measuring terminal lead. The sensitive region can be electrically connected to the superordinate unit. The sensor tube can be moved from a first position into a second position. The sensitive region is located in the interior space of the storage chamber in a first position and outside the storage chamber in the second position. The storage chamber, the opening, and the sensor tube, in the first position, are configured such that the reference/storage/calibration liquid is prevented from escaping from the interior space, and, in the second position, configured such a liquid transport is formed.

Abstract: The present disclosure relates to an electrochemical sensor for determining a measurand correlating with a concentration of an analyte in a measuring fluid, comprising: a sensor membrane designed to be in contact with the measuring fluid for detecting measured values of the measurand; a probe housing which has at least one immersion region designed for immersion into the measuring fluid, wherein the sensor membrane is arranged in the immersion region of the probe housing; and a measurement circuit which is at least partially contained in the probe housing and is designed to generate and output a measurement signal dependent on the measurand, wherein the sensor membrane contains an optically detectable substance for marking the sensor membrane.

Abstract: The present disclosure relates to an ion-selective electrode for an electrochemical sensor for determining a measurand representing a concentration of an analyte in a measuring medium, including a probe body made of a first material and a sensor element including a base body made of a second material different from the first material and an ion-selective layer arranged on the base body. The probe body is connected to the base body by way of a liquid-tight joint, where the joint is formed by a receptacle, serving as a first joining partner, and a joining section protruding into the receptacle, serving as a second joining partner.

Abstract: The present disclosure relates to an inline sensor arrangement for the detection of measurement values of a measurand representing an analyte content of a measuring medium, which arrangement comprises: a sensor which is designed to generate and output a measurement signal correlated with the measurand, wherein the sensor has at least one sterile sensor element provided for contact with the measurement medium; and a housing surrounding the at least one sensor element, which housing encloses the sensor element in a chamber sealed tightly against an environment of the housing, and wherein the chamber contains inside it a gas volume that is designed such that an influence of harmful substances—in particular, of reactive nitrogen and/or oxygen species—on the at least one sensor element is largely prevented. The present disclosure further relates to a method for the production of said inline sensor arrangement, and for its commissioning.

Abstract: A sensor system comprises a first mobile sensor unit and a stationary sensor unit. The first mobile sensor unit has a first sensor for acquiring a first measured value and a first wireless communication unit for receiving a calibration value and for transmitting the first measured value. The stationary sensor unit has a second sensor for acquiring a second measured value and a second wireless communication unit for transmitting the calibration value and for receiving the first measured value.

Abstract: The present disclosure relates to an electrode of an electrochemical measuring system and includes a housing having a chamber in which an electrolyte is arranged, and a potential-forming element which is at least partially arranged in the chamber such that the electrolyte at least partially wets the potential-forming element. A discharge line is made of coinage metal or of an alloy comprising a coinage metal and contacts the potential-forming element. A closure element closes the housing and guides discharge line therethrough. An adhesion promoter which comprises a glass and/or a glass-ceramic material and is arranged between the closure element and the discharge line.

Abstract: A potentiometric sensor having a measuring half cell with a conductor element, a reference half cell with a reference element, a measuring circuit connected with the conductor element of the measuring half cell and the reference element of the reference half cell and designed to create a measuring signal that is dependent on a potential difference between the conductor element and the reference element. The measuring half cell further includes a housing having a housing chamber closed off by a first ion-selective membrane and contacted by the conductor element, a first inner electrolyte contained within the housing chamber and contacting the ion-selective membrane. The conductor element includes an inner conductor, especially an inner conductor comprising a metallic conductor, connected with the measuring circuit and a gas-tight barrier separating the inner conductor from the first inner electrolyte.

Abstract: A sensor arrangement for determining at least one measurand of a measuring medium includes at least one first sensor with a first sensing element used to record measured values of a first measurand of the measuring medium, a housing having a housing wall which surrounds a housing interior containing the first sensing element, wherein the housing interior contains a medium in particular, a liquid which has a predetermined value of the first measurand.

Abstract: The disclosure includes an electrochemical half-cell including: a housing; a potential sensing element at least arranged on some segments inside the housing and connected electro-conductively with an electrical contact point outside the housing; and an electrolyte arranged inside the housing, wherein a plurality of hollow bodies is embedded in the electrolyte, especially distributed evenly inside the volume filled by the electrolyte.

Abstract: The present disclosure relates to a device in particular, a sensor for determining a measurand correlated with a concentration of an analyte in a measuring medium, including a housing that has a region provided for contacting the measuring medium, a fluid line arranged in the housing, an interface that is arranged within the region provided for contacting the measuring medium and has a first side which is in contact with the fluid line and a second side which is in contact with an environment of the housing in particular, with the measuring medium in contact with the housing, a first reservoir that is arranged in the housing and fluidically connected to the fluid line and which contains a reagent intended for contacting and/or interacting with the analyte, and a transport mechanism that is designed to transport reagent from the first reservoir into the fluid line.

Abstract: Disclosed is a digital pH sensor for measuring the pH, comprising an electronics unit, sensor housing having a first half-cell and a second half-cell adapted to form a potential difference between the first electrode and the second electrode if the digital pH sensor is in contact with a measurement medium, wherein the electronics unit is adapted for converting the potential difference into a digital voltage value or a digital pH value, wherein the first electrolyte, the first electrode, the second electrolyte, and/or the second electrode are selected such that, at a pH value of 7 and a temperature of 25° C. in the measurement medium, the potential difference of the two electrodes is not equal to 0 mV, and wherein the electronics unit converts the potential difference into the digital measured pH value of 7 or a digital measured voltage value of 0 mV.

Abstract: The present disclosure relates to a sensor system for the mobile acquisition of at least one measured value in a process medium. The sensor system comprises at least one first mobile sensor unit and at least one stationary sensor unit. The first mobile sensor unit has a first sensor for acquiring a first measured value and a first wireless communication unit for receiving a calibration value and for transmitting the first measured value. The stationary sensor unit has a second sensor for acquiring a second measured value and a second wireless communication unit for transmitting the calibration value and for receiving the first measured value.

Abstract: The present disclosure relates to a sensor element for a potentiometric sensor, comprising a substrate formed from a metal alloy and an ion-selective enamel layer arranged on the substrate, wherein the metal alloy comprises at least one transition metal and wherein the ion-selective enamel layer contains a proportion of an oxide of the transition metal, and wherein an electrically conductive transition zone is arranged between the substrate and the enamel layer and contains the transition metal in a plurality of different oxidation states.