Abstract:
A method for operating an ion-sensitive sensor with a measurement circuit which includes an ion-sensitive electrolyte-insulator-semiconductor structure (EIS);wherein the measurement circuit is embodied to issue an output signal which is dependent on ion concentration, especially a pH value, of a measured liquid; wherein the method comprises steps of: Introducing the ion-sensitive electrolyte-insulator-semiconductor structure into a measured liquid; accelerating charging processes in the region of an insulator layer of the ion-sensitive electrolyte-insulator-semiconductor structure by operating the sensor over a predetermined time span at least a first working point, dynamically adapting the working point to set a second working point, and registering and processing the output signal of the measurement circuit at the second working point.
Abstract:
A conductivity sensor for measuring conductivity of a medium surrounding the conductivity sensor, including: a first toroidal coil, which surrounds a first traversing opening for accommodating the medium and which serves for inducing an electrical current in the medium, a second toroidal coil, which surrounds a second traversing opening for accommodating the medium and which serves for registering a magnetic field produced by the induced electrical current. At least one of the toroidal coils has a plurality of first conductor sections, which extend in a plane of a multi-ply circuit card, a plurality of second conductor sections, which extend in a second plane of the circuit card, and a plurality of first vias, which connect the first conductor sections with the second conductor sections. The first conductor sections, the second conductor sections and the vias together form the windings of a toroidal coil, wherein at least one toroidal coil is surrounded by a plurality of internally metallized bores, which are arranged in such a manner, that they act as electrical shielding of the toroidal coil.
Abstract:
The invention relates to a device for measuring the concentration of ions, notably of hydrogen ions, in a measuring liquid using at least one ion-sensitive field effect transistor which is integrated into an electric circuit within the device in such a way that said circuit emits an output signal which serves as measure of the ion concentration in the measuring liquid. To provide a circuit which is as simple as possible and in particular comprises as few components as possible, the invention provides for the at least one pH-ISFET to be bridge-connected with at least three resistors.
Abstract:
An ion-sensitive sensor with an EIS structure includes: a semiconductor substrate, on which a layer of a substrate oxide 103 is produced; an adapting or matching layer, which is prepared on the substrate oxide; a chemically stable intermediate insulator, which is deposited on the adapting or matching layer; and a sensor layer, which comprises a tantalum oxide or a tantalum oxynitride, and which is applied on the intermediate insulator; wherein the intermediate insulator comprises hafnium oxide or zirconium oxide or a mixture of zirconium oxide and hafnium oxide, and wherein the adapting or matching layer differs in its chemical composition and/or in its structure from the intermediate insulator and from the substrate oxide.
Abstract:
A cable circuit for connecting a sensor module to a measurement transmitter. The 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 method for monitoring a reference half cell, which forms with a measuring half cell a potentiometric measuring point for determining and/or monitoring an ion concentration of a medium. The ion concentration of the mediums determined on the basis of at least one measurement signal determined in a measuring circuit, between the measuring half cell and the reference half cell. According to the invention, the measuring point is operated intermittently in an operating mode and in a test mode, wherein, in the operating mode, the ion concentration is measured and wherein, in the test mode, the proper functioning of the reference half cell is checked.
Abstract:
A potentiometric sensor for measuring a potentiometric variable of a medium comprises an ISFET whose gate region exhibits an ion-sensitive surface which can be exposed to the medium and which outputs an output signal that depends on the concentration of the ions at the ion-sensitive surface of the gate region. An evaluation circuit with a measuring input to which the output signal of the ISFET is applied is included, whereby the evaluation circuit is designed to output a measured value for the potentiometric variable, depending on the output signal. Also included is a measuring resistor which is arranged between the output of the ISFET and the input of the evaluation circuit, a monitoring circuit to determine the voltage drop over the measuring resistor, and a bridge section that is parallel to the measuring resistor to bridge the measuring resistor whereby the bridge section exhibits a switch with which the bridge section can be opened or closed.
Abstract:
A potentiometric sensor, especially a pH-sensor or redox-sensor, includes: an elementary sensor for registering a potentiometric parameter, especially a pH-value or a redox potential; and an interface for issuing a potentiometric-parameter-dependent signal to a superordinated unit, especially a transmitter; wherein the potentiometric sensor of the invention has a digital data memory, which is permanently connected with elementary sensor.
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:
In a conductive conductivity sensor having a probe, which is immersible in a measured medium and which comprises at least two electrodes made of a first, electrically conductive material and at least one probe body made of a second, electrically non-conductive material, the electrodes are at least partially embedded in the probe body and insulated from one another by the probe body, wherein the electrodes and the probe body are embodied as a composite workpiece. There especially exists between the first material and the second material in at least one section of a material transition between the first and the second material a secure bond, especially a bond based on intermolecular interactions or chemical bonds.