Abstract: A method for ascertaining at least one pipe wall resonance frequency of a pipeline in the region of a measuring point by means of a field device of process measurements technology having at least a first ultrasonic transducer, which is placed on the pipeline at the measuring point, comprising steps as follows: providing a first transfer function Utransducer(f) at least of the first or a plurality of ultrasonic transducers located in the region of the measuring point; ascertaining a received spectrum Urec(f) from a received signal Urec(t) after transmission of an ultrasonic signal; ascertaining a second transfer function Umeasuring point(f) from the first transfer function Utransducer(f) of the first or the plurality of ultrasonic transducers and from the received spectrum urec(f), wherein the second transfer function Umeasuring point(f) is characteristic for the measuring point; and ascertaining the at least one pipe wall resonance frequency fres, especially a plurality of resonance frequencies, in the region

Abstract: The present disclosure relates to a mass flow meter according to the Coriolis principle, comprising two measuring tube pairs which have different usage mode natural frequencies, an exciter for exciting flexural vibrations and a vibration sensor pair for detecting flexural vibrations; and comprising a circuit for driving the exciters and for detecting signals of the vibration sensors, for determining flow-dependent phase differences between the signals of the inlet-side and outlet-side vibration sensors and for determining mass flow measurement values based on the flow-dependent phase differences, wherein the circuit is configured to perform, when determining the mass flow measurement values based on the flow-dependent phase differences, a zero-point correction for the first measuring tube pair and/or the second measuring tube pair using signal amplitude ratios of the measuring tube pairs.

Abstract: The sensor assembly of the present disclosure comprises a temperature detector and a support element having a middle segment, a first end segment and a second end segment. A coupling body couples the temperature detector thermally conductively with the support element. The temperature detector and coupling body are connected by material bonding and arranged on a first surface of the support element. The coupling body is connected with the support element by material bonding to form a coupling body to support element connection zone. Additionally, a smallest bending stiffness, which the middle segment has in the region of the coupling body to support element connection zone, is greater than a smallest bending stiffness, which the support element has, as a whole, and/or greater than a smallest bending stiffness, which the first end segment has, and/or greater than a smallest bending stiffness, which the second end segment has.

Abstract: The present disclosure relates to an ultrasound transducer having at least one transducer element for sending or receiving ultrasound signals. The ultrasound transducer includes a matching element acoustically coupled to the transducer element that is designed to ensure acoustic matching between the transducer element and a medium that acts on the matching element. In a first subregion of the axial extent, the matching element partially fills each cross section of the matching element, and a filling component in the first subregion along the first longitudinal axis monotonically increases in the direction of the first side. The matching element has a plurality of ring elements in the first subregion arranged concentrically around the first longitudinal axis. Each ring element partially fills each cross section in the first subregion, wherein the first subregion comprises at least 80% of an axial extent of the matching element along the first longitudinal axis.

Abstract: A measuring tube for guiding a fluid for a flow meter device according to the vortex measuring principle, wherein the measuring tube has an inflow-side opening in an inflow-side end face and an outflow-side opening in an outflow-side end face, between which the measuring tube extends in the axial direction includes: a bluff body which is arranged in the measuring tube, wherein the bluff body functions to bring about a Kármán vortex street with a flow-rate-dependent vortex frequency when a fluid flows through the measuring tube; at least one vortex detector for detecting vortexes of the vortex street and for providing vortex-dependent signals; and a control valve between the vortex detector and the outflow-side end face and axially spaced apart from the vortex detector, which annularly constricts the flow cross-section of the measuring tube.

Abstract: The Coriolis flowmeter according to the present disclosure includes: a measuring sensor including a bent measuring tube mirror-symmetrical with respect to a transverse plane, wherein a measuring tube center line runs in a longitudinal plane oriented perpendicular to the transverse plane, wherein an equatorial surface runs perpendicular to the longitudinal plane along the measuring tube center line; an exciter for exciting measuring tube bending vibrations; a first pair of vibration sensors for capturing the bending vibrations of the measuring tube; and an operating and evaluation circuit for driving the exciter, for capturing signals from the vibration sensors, and for determining a mass flow measured value, wherein the measuring sensor has a second pair of vibration sensors, which are arranged in a mirror-symmetrical manner with respect to the transverse plane, wherein the first pair of vibration sensors is separated from the second pair of vibration sensors by the equatorial surface.

Abstract: A mass flow measuring sensor includes: an oscillatable measuring tube bent in a tube plane; an oscillation exciter for exciting bending oscillations in a bending oscillation use-mode; two oscillation sensors for registering oscillations; a support system; and a measuring sensor housing; wherein the support system has support system oscillation modes, including elastic deformations of the support plate; wherein the support plate is cut to form a number of spirally shaped spring securements, via which the support plate is secured to the measuring sensor housing with oscillation degrees of freedom, whose eigenfrequencies are lower than a use-mode eigenfrequency of the bending oscillation use-mode, wherein the use-mode eigenfrequency is lower than the eigenfrequencies of the support system oscillation modes, wherein a calibration factor describes a proportionality between a mass flow through the measuring tube and a phase difference between oscillations of the measuring tube oscillating in the bending oscillation

Abstract: A Coriolis measuring device for measuring volume flow or density of a medium flowing through a measuring tube is disclosed, the device comprising: the measuring tube for conveying the medium; at least one exciter, which is adapted to excite the measuring tube to execute oscillations; at least one sensor, which is adapted to register the oscillations of the measuring tube; an electronic measuring/operating circuit, which is adapted to operate the exciter as well as the sensor and to determine and to output flow and/or density measurement values; wherein the electronic measuring/operating circuit has an electronics board, wherein at least one exciter has a stationary exciter element, and/or wherein at least one sensor has a stationary sensor element, wherein at least one stationary exciter element and/or at least one stationary sensor element is integrated into the electronics board.

Abstract: The present disclosure relates to a method for determining the methane index of a hydrocarbon-containing combustion gas mixture which has natural gas or biogas, having the steps: flowing the gas mixture through a measuring assembly; determining a first value of a first measurement variable related to a viscosity of the gas mixture; determining a second value of a second measurement variable related to a density of the gas mixture; determining a pressure value of the gas mixture, said pressure value belonging to the first value and the second value; determining a temperature value of the gas mixture, said temperature value belonging to the first value and the second value; and determining the methane index as a function of the first value, the second value, the pressure value, and the temperature value.

Abstract: A method for testing a device under test, the device under test being a measuring instrument to measure a physical parameter of a fluid, includes: performing a plurality of valid test runs, wherein a valid test run includes: exposing the device under test and a reference measuring instrument to the fluid under a set of influences, the set of influences being defined by influence parameters; monitoring the influence parameters; obtaining a reference value for the physical parameter from the reference measuring instrument; and obtaining a test value for the physical parameter from the device under test, wherein a test run is invalidated if influence parameters do not meet specified test requirements for the influence parameters; and then evaluating a plurality of test values originating from the plurality of valid test runs with respect to at least one of accuracy, repeatability and reproducibility.

Abstract: The present disclosure relates to a method for producing a coil holder of a magnetic inductive flowmeter by injection molding, wherein the coil holder has two coil cores cast in a plastic casting, which two coil cores each have a first longitudinal axis, the method comprising: providing and positioning of a mold with a cast volume and the two coil cores, wherein each coil core has two end faces and a lateral surface, wherein the lateral surface has a central region and two outer regions bounding the central region, wherein the cast volume completely bounds the central regions in a coil region, wherein the outer regions and the end faces are outside of the cast volume; filling the cast volume with a plastic; allowing the plastic to harden; and removing the mold from the plastic casting, wherein the cast volume is continuous.

Abstract: A transducer apparatus comprises a deformation body as well as, positioned on the deformation body and connected therewith by material bonding, a radio sensor having a surface facing away from the deformation body. The radio sensor is adapted to receive free-space electromagnetic waves and to convert them into acoustic surface waves propagating along the surface facing away from the deformation body, or to convert acoustic surface waves propagating along the surface into free-space electromagnetic waves. Additionally, the deformation body is adapted as a function of a mechanical force acting thereon, and/or as a function of a temperature change, to be at least partially deformed, in such a manner that at least the surface of the radio sensor facing away from the deformation body experiences a shape change influencing a propagation of acoustic surface waves propagating along the surface.

Abstract: A method for determining the viscosity of a medium using a Coriolis mass flow meter comprises exciting bending vibrations in the measuring tube in a symmetrical bending vibration use mode using an exciter arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a central vibration sensor also arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a vibration sensor on the inlet side and of a vibration sensor on the outlet side; determining a phase relation or time delay between the sensor signals of the central vibration sensor and a symmetrical function of the sensor signals on the inlet-side and outlet-side vibration sensors; and determining the viscosity of the medium as a function of the phase relation or time delay.

Abstract: The present disclosure relates to a Coriolis mass flow meter including two measuring tube pairs each having two measuring tubes mounted as to oscillate relative to one another and have a bending vibration excitation mode of different excitation mode natural frequencies, each pair having an electrodynamic exciter and a vibration sensor pair including a first inlet-side vibration sensor and a first outlet-side vibration sensor, and further includes a circuit configured to determine phase difference-dependent mass flow measurement values, wherein a difference deviation between a first relative signal amplitude difference of sensor signals having the first excitation mode natural frequency and a second relative signal amplitude difference of sensor signals having the second excitation mode natural frequency is not more than a tolerance value.

Abstract: The present disclosure recites a method for time controlled carrying out of a filling process including steps of beginning a first flow measurement before or during the start of a filling of a first container, starting the filling of the first container at a first point in time, and ending the filling of the first container at a second point in time, wherein the second point in time is predetermined by a set, first time interval. The starting and ending steps are repeated for filling a second container. The method also includes ending the first flow measurement and ascertaining a total flow of the preceding fillings, comparing an actual value ascertained from the total flow a predetermined, desired value, and-adapting the first time interval based on the comparing step. An apparatus according to the present disclosure includes a control setup for time controlled fill amount control and a flowmeter.

Abstract: The present disclosure relates to a method for operating a magnetoinductive flowmeter in which, during a constant phase having a constant magnetic field, a plurality of raw measured values of the raw measurement voltage are determined, the raw measurement voltage including a flow-dependent component, an interference component and a noise component, wherein each raw measured value assigned a flow measured value and an interference voltage value, wherein a raw measured value from a preceding first constant phase and a raw measured value from a second constant phase following the first constant phase are used to calculate a second flow measured value and a second interference voltage value of the interference component, wherein first flow measured values from the first constant phase and/or second constant phase are corrected using the knowledge of the second flow measured value and the calculated second interference voltage value.

Abstract: A measuring device for the determination of at least one thermal property of a fluid, for example, the volumetric heat capacity and the thermal conductivity, wherein the measuring device includes a thermal property sensor and an evaluation unit, wherein the evaluation unit is adapted to determine the thermal property from a measurement signal determined by the thermal property sensor, wherein the thermal property sensor includes a heater, a first temperature sensor and a second temperature sensor, wherein the thermal property sensor includes a mounting plate with an opening, wherein the heater, the first temperature sensor and the second temperature sensor are arranged above or inside the opening.

Abstract: Disclosed is a magnetically inductive flowmeter comprising: a measuring tube; a magnet system having a coil system comprising a coil and a coil core within the coil, wherein the magnet system produces a magnetic field perpendicular to the measuring tube; at least two measuring electrodes for sensing an electrical voltage induced in the medium; and a field guide to guide the magnetic field between a side of the coil far from the measuring tube and a side of the measuring tube far from the coil, wherein the magnet system has a pole shoe to lead the magnetic field between the measuring tube and the field guide, wherein the pole shoe has a folded sheet metal piece, the field guide has a folded sheet metal piece, and the pole shoe and the field guide are magnetically and mechanically in contact in an interior of the first coil.

Abstract: Disclosed is a thermal flowmeter for measuring mass flow of a medium in a measuring tube, comprising: a measuring tube having a tube wall and a tube axis; a sensor with four probes, extending from a sensor base into the measuring tube, wherein the probes are adapted to heat medium, to determine its temperature or to influence a flow of the medium; and an electronic circuit, adapted to operate the probes and to create and to provide flow measured values. Each probe has a probe base and a probe active portion, wherein the probe active portion is adapted to heat the medium, to determine the temperature of the medium, and/or to influence a flow of the medium. The probe bases define a rhombus on a surface of the sensor base, wherein the rhombus is defined by geometric centers of cross sections of the probe bases.

Abstract: An intrinsically safe circuit arrangement for supply of electrical power to a consumer having a maximum power requirement, comprising: a voltage source; a voltage monitor for limiting an output voltage to a maximum value; an electrical current limiting resistor for limiting an output electrical current to a maximum value; and an actively controlled electrical current limiting circuit for limiting output electrical current to an electrical current limit value, wherein the electrical current limiting circuit is embodied such that it controls at least the output current to the electrical current limit value as a function of a voltage drop across a part of the electrical current limiting circuit, when a loading of the circuit arrangement above the nominal load is present, such that an adapting of the electrical current limit value occurs, preferably based on a predetermined characteristic curve.