Abstract: A Coriolis mass flow measuring device and/or density measuring device, comprising: at least two measuring tubes which extend mirror symmetrically to a first mirror plane; at least one exciter mechanism and at least one sensor arrangement for exciting and registering measuring tube oscillations; two terminally located collectors for joining the measuring tubes; a support body for connecting the collectors; and a number of plate-shaped couplers for pairwise connecting of the measuring tubes for forming an oscillator. The measuring tube centerlines of the measuring tubes have two oppositely bent sections and an intermediately lying straight section. The second bent section is arranged on the side of the straight section away from the second mirror plane.

Abstract: A method for providing an access key for a field device of automation technology, wherein the access key controls accessing of the field device, includes: producing an individual key; storing the individual key in a database together with an identification feature of the field device; storing the individual key in the field device which is to be unlocked based on an input access key; ascertaining at least the identification feature of the field device for which the access key is to be provided; and forming/producing/generating the access key, such that it includes at least one hash value, wherein the hash value is formed at least from the individual key read-out from the database with the assistance of the ascertained identification feature.

Abstract: A sensor assembly has a deformation body having two oppositely lying surfaces and an outer edge segment as well as a sensor blade extending from the surface to a distal end and having a left side, first lateral surface and a right side, second lateral surface. An overload protection apparatus protects the deformation body against plastic deformation and has a support stirrup led with lateral separation around the sensor blade and a first stop and a second stop located on opposite sides of the sensor blade. The stops are so arranged that an intermediate space formed therebetween receives only a portion of the sensor blade. The deformation body and the sensor blade are excitable to oscillate about a shared static resting position and to be moved in such a manner that the sensor blade executes pendulum-like movements elastically deforming the deformation body.

Abstract: A method for determining compressibility of a flowing fluid includes: using a pump, driving a volume flow of the fluid through a measuring tube of a vibronic densimeter at a first pressure maintained using a throttle; determining a first density measured value of the fluid at the first pressure; determining a first pressure measured value at the first pressure; driving a volume flow of the fluid through the densimeter at a second pressure; determining a second density measured value at the second pressure different from the first pressure; determining a second pressure measured value at the second pressure; determining compressibility of the fluid based on the first density measured value, the second density measured value, the first pressure measured value and the second pressure measured value assuming the composition of the fluid is unchanged between the registering of the first density measured value and the second density measured value.

Abstract: A magneto-inductive flow measuring device is disclosed that includes a measuring tube with a measuring tube axis and two measuring electrodes arranged diametrally opposite one another on the measuring tube and from which a signal is tapped for ascertaining a flow. The flow measuring device includes four other electrodes in pairs arranged diametrally opposite one another on the measuring tube, forming second and third electrode axes that intersect the measuring tube axis, where the two electrode axes are arranged offset from a parallel projection of the first electrode axis onto the second cross-sectional plane by a clockwise or counterclockwise angular measure. The flow measuring device further includes an evaluation unit for detecting a flow profile based on measurement signals tapped from the electrodes of the two electrode axes. A further aspect of the disclosure includes a method for compensating a flow profile related measurement error in a flow measurement.

Abstract: A fluid line system comprises fluid lines (100, 200, 300, 400). Each of the two fluid lines (100, 400) has in each case one lumen (100*; 400*) which is enclosed by a wall, and extends from a flow opening (100a; 400a), located in a respective first line end (100+; 400+), of the respective fluid line both to a flow opening (100b; 400b) which is located in a line end (100#; 400#) of said fluid line (100; 400) and also as far as a flow opening (100c; 400c) which, spaced apart from said flow opening (100b; 400b), is likewise located in each case in the line end (100#; 400#) of said fluid line (100; 400).

Abstract: A mass flow sensor includes: a vibratory measurement tube bent in a tube plane; a vibration exciter for exciting bending vibrations in a bending vibration use-mode; two vibration sensors for sensing vibrations; a support system having a support plate, bearing bodies on the inlet and sides; and a sensor housing, wherein: the support system has support system vibration modes which include elastic deformations of the support plate; the measurement tube is connected fixedly to the support plate by the bearing body on the inlet side and by the bearing body on the outlet side; and the support plate has a number of spring-loaded bearings exposed through cut-outs in the support plate by which the support plate is mounted on the sensor housing with degrees of vibrational freedom, the natural frequencies of which are lower than a use-mode natural frequency of the bending vibration use-mode.

Abstract: A thermal, flow measuring device comprising a sensor with a metal sensor housing, which includes a cap with a lateral surface and an end face, wherein the sensor housing has at least first and second pin sleeves, which protrude starting from the end face, wherein the sensor housing has a first heater in a first of the two pin sleeves and a temperature sensor in a second of the two pin sleeves for ascertaining a temperature of the medium; wherein the end face of the cap is divided at least into a base area and at least a first planar area inclined relative to the base area by an angle, wherein a second heater is arranged on an inner surface of the cap in the region of this first area.

Abstract: A method for determining properties of a hydrocarbon containing gas mixture, especially natural gas or biogas, comprising: allowing the gas mixture to flow through a measuring arrangement; determining a pressure- and temperature dependent viscosity measured value, an associated measured value of temperature and an associated pressure measured value of the flowing gas mixture; ascertaining a first value of a first variable, which characterizes the energy content of the flowing gas mixture, based on viscosity measured value, the associated measured value of temperature, and the associated pressure measured value, wherein the first variable characterizing the energy content is the Wobbe index or the calorific value of the flowing gas mixture, wherein the Wobbe index is preferable.

Abstract: The present disclosure relates to a sensor for a thermal flow measuring device, to a thermal flow measuring device, as well as to a method for the manufacture of such a sensor. The sensor includes a sensor thimble, wherein a defined separation of a sensor element from a thimble floor of the sensor thimble is provided by spacers so that a temperature transfer between the sensor and a liquid flowing around the sensor is provided. Thermal contact between the thimble floor and the sensor element is provided by a solder layer.

Abstract: A pressure resistant adapter, for connecting a transmission line to a field device has a shell, insertable into a wall of a housing of the field device. The shell has an interior open to an interior of the housing and closed to the exterior by an end wall of the shell. An insert, installed in the shell, includes a base element and a projection protruding out of the shell through an opening in the end wall of the shell. The base element has a basal area greater than a basal area of the opening. A connection element is provided on an end of the projection protruding out from the shell, to which the transmission line is connectable, and at least one conductor extends through a window that is located in the base element adjoining the bore in the projection and opens to the interior of the housing.

Abstract: The present disclosure relates to a measurement sensor of the vibrational type for measuring the density and/or the mass flow of a medium, including: two oscillators; an exciter for stimulating oscillator vibrations; and two vibration sensors, wherein the first oscillator includes first and second measuring tubes and a first resilient vibration coupler for coupling the measuring tubes, wherein the second oscillator includes third and fourth measuring tubes and a second resilient vibration coupler for coupling the third and fourth measuring tubes, wherein perpendicularly to a measuring tube transverse plane a measurement sensor longitudinal plane extends between the third and the fourth measuring tube, wherein the first and third measuring tube relative to a measurement sensor longitudinal plane are in mirror symmetry relative to one another, and wherein the second and fourth measuring tube relative to the measurement sensor longitudinal plane are in mirror symmetry relative to one another.

Abstract: An apparatus for monitoring at least one physical or chemical process variable, comprising at least one measurement branch and a compensation branch connected in parallel therewith for compensating the influence of at least one environmental parameter on the process variable and/or on the measuring of the process variable. The measurement branch includes at least one primary sensor unit and a primary electronics unit for signal registration, evaluation, and/or feeding. The compensation branch includes at least a secondary sensor unit and a secondary electronics unit. The secondary sensor unit is so embodied that it registers a physical or chemical variable characteristic for the at least one environmental parameter, wherein the secondary electronics unit is so embodied that it draws the required energy from the measurement branch, and that it produces from the characteristic physical or chemical variable a compensation signal, which it transmits to the primary electronics unit of the measuring branch.

Abstract: Disclosed is a field device of automation technology, comprising: a housing having a wall; a data transmission means arranged on an outside of the housing wall; and an electronic operating circuit arranged in a housing chamber and is adapted to operate the data transmission means, wherein the data transmission means and the electronic operating circuit are connected via an electrical signal line having a plurality of electrical conductors, wherein a first electrical conductor is adapted to lead a data signal and wherein at least a second electrical conductor is adapted to shield the first electrical conductor, wherein the signal line has an isolation device adapted to isolate a first signal line section galvanically from a second signal line section, wherein the isolation device includes an electromagnetically transparent plate having a first lateral surface and a second lateral surface parallel to the first lateral surface.

Abstract: The invention relates to a method for ascertaining a physical parameter of a gas using a measuring transducer having a measuring tube for conveying the gas, wherein the measuring tube is excitable to execute bending oscillations of different modes and eigenfrequencies, the method includes: ascertaining the eigenfrequency of the f1-mode and f3-mode; ascertaining preliminary density values for the gas based on the eigenfrequencies of the f1-mode and f3-mode; ascertaining a value for the velocity of sound of the gas, and/or, dependent on the velocity of sound and the eigenfrequency of a mode, at least one correcting term and/or density error for the preliminary density value; and/or a correcting term for a preliminary mass flow value for determining a corrected mass flow measured value based on the first preliminary density value, the second preliminary density value, the eigenfrequencies of the f1-mode and f3-mode.

Abstract: A flow measuring device operating on the vortex counter principle, comprises: a measuring tube; a blockage in the form of a bluff body in the measuring tube for bringing about a Karman vortex street with flow dependent vortex frequency; a first pressure fluctuation measuring arrangement for registering vortex related pressure fluctuations and for providing signals dependent on pressure fluctuations; a second pressure fluctuation measuring arrangement for registering vortex related pressure fluctuations and for providing signals dependent on pressure fluctuations. The first pressure fluctuation measuring arrangement is spaced in the longitudinal direction of the measuring tube from the second pressure fluctuation measuring arrangement.

Abstract: A method for determining density and/or mass flow of a compressible medium with a measuring transducer of vibration-type having at least two oscillators, each including a pair of measuring tubes, wherein the pairs of measuring tubes are arranged for parallel flow, wherein the two oscillators have mutually independent oscillator oscillations with mutually differing eigenfrequencies for corresponding oscillation modes. The method includes steps of determining the values of the eigenfrequencies of at least two different oscillator oscillations, determining at least two preliminary density measured values based on the values of the eigenfrequencies, and determining a correction term for one of the preliminary density measured values and/or for a preliminary measured value of flow based on the preliminary density measured values and the values of the eigenfrequencies.

Abstract: A method serves for operating a measuring transducer of vibration-type having at least two oscillators, each of which is formed by a pair of measuring tubes, wherein the pairs of measuring tubes are arranged for parallel flow, wherein the two oscillators have mutually independent oscillator oscillations with mutually differing eigenfrequencies for corresponding oscillation modes. The method includes steps of determining a first value of a primary measurement variable, or of a variable derived therefrom, using the first oscillator, determining a second value of the primary measurement variable, or of a variable derived therefrom, using the second oscillator, checking an actual ratio between the first value and the second value by comparison with an expected ratio between the first value and the second value, and outputting a signal when the actual ratio does not correspond to the expected ratio.

Abstract: The present disclosure relates to a Coriolis mass flow meter including: a measuring tube; an one exciter for generating vibrations in the measuring tube; two sensors for detecting the vibrations in the measuring tube and for outputting associated sensor signals; and an operating and evaluating unit for determining a mass flow value of a medium in the measuring tube based on a phase difference or time difference between the sensor signals, wherein for Reynolds numbers below a Reynolds number threshold a cross-sensitivity to a viscosity of the medium correlates with a Stokes number, wherein the operating and evaluating unit is configured to determine a current value of the Stokes number for Reynolds numbers below the lower Reynolds number threshold and to compensate for the influence of the cross-sensitivity in the determining of the mass flow.

Abstract: A measuring transducer comprises two flow dividers having, in each case, two tubular chambers separated from one another and adapted for guiding in- and out flowing fluid, of which each has a chamber floor, in which are formed, in each case, two mutually spaced flow openings communicating with a lumen of the chamber, and as well as a tube arrangement having at least four measuring tubes connected to the flow dividers for guiding flowing fluid with parallel flow. Moreover, the measuring transducer comprises an electromechanical exciter mechanism for exciting mechanical oscillations of the measuring tubes as well as a sensor arrangement for registering oscillatory movements of the measuring tubes and for generating at least two oscillation measurement signals representing oscillations of at least one of the measuring tubes.