Abstract: The invention relates to an inductively operating sensor (1) for measuring the electrical conductivity of a fluid medium (2), having an excitation coil (3) to which an input signal is fed and a receiver coil (4) coupled to the excitation coil (3) via the fluid medium (2), the receiver coil (4) providing an output signal (IInd) which is a measurement of the conductivity of the fluid medium (2). The sensor (1) has means (5) for measuring a variable signal at the input of the excitation coil (3) for timely detection of damage to the windings of the excitation coil (3), the receiver coil (4), and/or to a power cable network for the sensor (1). The excitation coil (3) of the sensor is preferably fed by an input voltage (UErr) and the means (5) for measuring the variable signal preferably measure the input current (IErr) at the input of the excitation coil (3).

Abstract: An apparatus for holding a sensor for sensing the contents of a vessel is provided. The apparatus has an extended position where the sensor is exposed to the contents and a retracted position for cleaning the sensor. The apparatus includes a process connection configured to connect the apparatus to the wall of the vessel. The process connection defines an aperture including a first rim, a second rim angularly displaced from the first rim, and a sidewall extending between the first rim and the second rim. The sidewall is angularly displaced from the first rim by no less than 135 degrees.

Abstract: The invention relates to a connector comprising a plug element and a socket element which can be detachably connected to the plug element for connection of a transmission line to at least one sensor. This connection prevents moisture, dust or dirt particles and corrosive substances penetrating between the plug element and the socket element from adversely affecting the signal transmission between the plug element and the socket element. The connector utilizes an inductive, optical or capacitive contactless signal transmission between the plug element and the socket element.

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: A measuring system for determining physical and chemical properties of gases, liquids and solids includes a computing unit which is coupled with at least one sensor by means of a high capacity communications network. The system eliminates the need for dedicated cabling between the sensor and the computing unit.

Abstract: The invention concerns an opto-electronic sensor, in particular for the measurement of opaqueness in a medium, having a transmitter channel (6) irradiating light waves along a first axis (20) and with at least one receiver channel (8, 10) which detects light waves interacting with the medium and which cooperates within an evaluation unit. In order to optically isolate the transmitter and receiver channels from each other, the sensor is configured in such a fashion that a common window (12) made from an optically transparent material is provided for sealing the transmitter channel (6) and the receiver channel (8, 10) with respect to the medium to be measured and for coupling in and coupling out the light waves.

Abstract: Present invention relates to a process for determining the electrical conductivity of fluids by means of conductively operable conductivity measuring cells using analysis and processing measurement technology, wherein the conductivity of the fluid is determined from a measured resistance value and the geometric measuring cell constants (k); in order to reduce error in the determination of the electrical conductivity, this is determined in the following manner: by using a measurement converter, the impedance of the measuring cell immersed in the fluid is determined for at least two frequency values of an alternating voltage, the frequency-independent parameters (n, Q) and the desired resistance (Rf1) are determined based on the determined impedance values and based on an equivalent circuit diagram comprised of a parallel connection of a capacitor (Ccell) representing the measuring cell capacitance, an ohmic resistance (Rf1) representing the desired resistance of the fluid inside the conductivity measuring ce

Abstract: A measuring device for determining the physical and/or chemical properties of gases, liquids and/or solids is provided with a computing unit. The computing unit is connected with a sensor circuit for a sensor. The computing unit furthermore is provided with program commands for processing the measured data measured by the sensor and processed by the sensor circuit. An exchangeable program module is associated with the sensor circuit in the computing unit. A modular structure of the measuring device is achieved in this way.