Abstract: Disclosed is an ultrasonic flow tube comprising: a flow chamber for accepting an inflow of a gas, comprising a center pipe and a plurality of outer pipes surrounding the center pipe, connected between an inlet wall and an outlet wall of the flow chamber such that a velocity of the gas within the center pipe and the plurality of outer pipes is numerically same; and a first transducer attached near the inlet wall and a second transducer attached near the outlet wall, wherein a first acoustic wave package generated by the first transducer and a second acoustic wave package generated by the second transducer is transmitted into the flow chamber such that the center pipe receives a majority of the first and the second acoustic wave package, and the plurality of outer pipes receives a minority of the first acoustic wave package and the second acoustic wave package.

Abstract: Embodiments relate to a system including a gas meter, regulator, and head end system. The system can include installing a regulator in a gas supply grid. The system may also include installing a gas meter in a gas supply grid, wherein the gas meter is installed to diagnose a grid pressure over flow rate of the regulator. In addition, the system may include determining, by the gas meter, an initial fingerprint of the regulator, wherein the initial fingerprint indicates an initial pressure and flow rate profile over a time period after the gas meter was installed. Further, the system can include comparing, by the gas meter, continuous pressure readings of the regulator with the initial fingerprint, wherein the gas meter determines if the continuous pressure readings correspond to the initial fingerprint. The system may also include notifying, by the gas meter, a head end system of the continuous pressure readings.

Abstract: A magnetic flowmeter assembly is provided having a tubular body, having opposing open ends and defining a fluid flow path therebetween along a longitudinal axis (Ax). A pair of coil assemblies is coupled to the tubular body in an intermediate region thereof supported by an adjustable brace. A pair of measuring electrodes is attached to the tubular body in electrical communication with the fluid with the flow path and aligned along an axis (Ay) orthogonal to the longitudinal axis (Ax) and orthogonal to the axis (Az). Auxiliary electrodes are disposed upstream and downstream of the pair of measuring electrodes.

Abstract: A venturi flowmeter includes a ring of which the inside is hollow and which prevents inner wall abrasion or fatigue load accumulation at a main orifice and thus can reduce maintenance costs. The venturi flowmeter includes a main orifice of which the inside is hollow and an element of which one side has a hollow inside having the same diameter as that of a through-hole of the main orifice, and which has a tapered shape toward the other side thereof. A diffuser has one side having a hollow inside of the same diameter as that of the through-hole of the main orifice, and which has a tapered shape toward the other side thereof. A ring is connected between the main orifice and one side of the element. The ring includes a stopper formed along an inner wall and having a hollow central portion.

Abstract: An ultrasonic flow amount measuring device includes a pair of tube holding portions respectively connected to a base by a shaft portion so as to be openable and closeable, and ultrasonic transmission and reception units disposed in the tube holding portions so as to face each other in an inclined direction. When the tube holding portions are opened so as to insert a tube between holding concave portions formed in clamping portions and closed so as to clamp the tube, front end surfaces of ultrasonic transmission bodies are in close contact with both sides of a surface of the tube. When measuring a flow amount, an ultrasonic beam is alternatively transmitted and received between the ultrasonic transmission and reception units through the tube. A flow rate is obtained by obtaining a transmission time difference between the travel time and the return time of the ultrasonic beam.

Abstract: A method and corresponding device are provided for determining a flow speed in a fluid conduit. The fluid conduit is provided with first, second and third ultrasonic wet transducers, wherein respective connection lines between transducers extend outside of a direction of average flow of the fluid conduit. First and second measuring signals are applied to the first ultrasonic wet transducer and received at the second and the third ultrasonic wet transducer, respectively. The measuring signals comprise a respective reversed signal portion with respect to time of a response signal. Respective first and second response signals are measured and the flow speed is derived from at least one of the first and second response signals.

Abstract: A magnetic flowmeter for measuring a fluid flow includes a flow tube assembly receiving the flow and having a coil with first and second coil wires for receiving a coil current and responsively producing a magnetic field thereby generating an EMF in the fluid representative of a flow rate. An EMF sensor is arranged to sense the EMF and generate an output indicating the flow rate. Current supply circuitry applies a current supply signal to the coil. A load leveling boost supply provides power to the current supply circuitry. In another aspect, power scavenging circuitry recovers power from the coil.

Abstract: An example system is configured for determining properties of a fluid in a conduit. The system includes a mass flow meter including a hollow conduit having an inlet, an outlet, and a wall. The conduit is for conducting the fluid. The system includes a driver coupled to the conduit. The driver is configured for inducing an oscillation in the conduit. The system includes two or more accelerometers coupled to the conduit. The two or more accelerometers are configured for measuring displacement of the conduit. The system includes an electrical permittivity sensor coupled to the conduit. The electrical permittivity sensor is configured for measuring electrical permittivity of the fluid.

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 flow rate measurement method includes: measuring a first pressure of a gas filled in a first flow path connected to a flow rate controller and a second flow path connected to the first flow path; supplying a gas to the first and second flow paths via the flow rate controller and measuring a second pressure and a temperature of the gas filled in the first and second flow paths; after the gas is exhausted from the second flow path, measuring a third pressure of the gas filled in the second flow path; measuring a fourth pressure of the gas filled in the first and second flow paths; and calculating an amount of the gas supplied to the first and second flow paths via the flow rate controller, based on the first, second, third, and fourth pressures and the temperature.

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: A sensor device is provided for fitting to an object through which a medium flows, in particular to a pipeline. The sensor device comprises at least one converter device having at least one flexible converter element which comprises at least one electrically conductive conductor element and, for the sectional coverage of the object, is transposable to an operating position, in which it is at least partially arranged about a longitudinal axis. The converter device comprises a resetting device having at least one transmission element which is arranged on the converter element. The resetting device is provided for the setting and/or resetting of the converter element in the operating position.

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 flow system includes a flow sensor, a first pipe configured to transport fluid from an upstream fluid source to the flow sensor, and a second pipe configured to transport fluid from the flow sensor to a downstream fluid distributor. Proximate the flow sensor, the first pipe has a first interior diameter and the second pipe has a second interior diameter. The flow system further includes at least one of the following: a flow diversion or flow obstruction positioned between the flow sensor and the upstream fluid source a distance or length from the flow sensor that is less than ten times the first interior diameter of the first pipe and/or a flow diversion or flow obstruction positioned between the flow sensor and the downstream fluid distributor a distance or length from the flow sensor that is less than five times the second interior diameter of the second pipe.

Abstract: The invention provides a gas flow metering gas chamber and a gas flow meter. The gas flow meter includes the gas flow metering gas chamber, a display device and a housing. The gas flow meter gas cell includes a cavity, a gas inlet, a gas outlet, two ultrasonic transducer mounting holes and a reflection device. The signal emitted by the first ultrasonic transducer installed in the first ultrasonic transducer mounting hole and the signal emitted by the second ultrasonic transducer installed in the second ultrasonic transducer mounting hole intersects with each other to form an L-shaped reflection passage. Compared with V-shaped, W-shaped, and N-shaped reflection structures, the effective distance between the two ultrasonic transducers of the present invention more is increased, the cross section of the cavity is reduced, and the rate of the gas flow is increased, which avoids contamination contained in the measured gas to contaminate the ultrasonic transducers and thereby improves the measurement accuracy.

Abstract: A flowmeter body assembly includes a flowmeter body, a fluid passage, and multiple angled connectors. The fluid passage extends through the flowmeter body. The angled connectors extend from a sidewall of the flowmeter body. The flowmeter body and the angled connectors form a one-piece structure formed by an additive manufacturing process. Each of the angled connectors is configured to support a respective sensor to enable measurement of a flow rate of a fluid across at least one chordal plane of the flowmeter body.

Abstract: The subject matter of this specification can be embodied in, among other things, a fluid flow measurement apparatus includes an inlet configured to flow a dynamic fluid flow, an outlet configured to flow the dynamic fluid flow, a first fluid conduit fluidically connected between the inlet and the outlet, configured with a first predetermined geometry, and configured to flow a first portion of the dynamic fluid flow, a second fluid conduit fluidically connected between the inlet and the outlet, configured with a second predetermined geometry, and configured to flow a second portion of the dynamic fluid flow, and a first flow meter configured to measure the second portion of the dynamic fluid flow.

Abstract: A wearable device collects a plurality of photoplethysmography (PPG) waveforms from a PPG sensor in the wearable device and collects inertial data associated with subject motion from an inertial sensor in the wearable device. The wearable device processes the inertial data in an assessment processor of the wearable device to determine a data integrity of the plurality of PPG waveforms and, responsive to the determined data integrity, processes the plurality of PPG waveforms in the assessment processor using a neural network comprising thousands of coefficients to generate an assessment of the subject blood pressure.

Abstract: A flow measurement system includes two or more flow sensors that may operate simultaneously and a plurality of connected flow paths for flow of fluids. Each flow sensor is positioned along a different flow path of the plurality of connected flow paths and includes at least one flow tube and a support that clamps the flow tube. The flow tube of each flow sensor has a different resonant frequency so that cross-talk between the flow sensors can be reduced or eliminated. In some embodiments, the flow tube of each flow sensor has a different tube length, wall thickness, material, and/or weight. The flow measurement system can also include one or more pumps for pumping fluid into the flow sensors and a dampener arranged between a pump and a corresponding flow sensor for mitigating interference on the flow sensor from operation of the pump.

Abstract: An industrial process field device includes a piezoelectric transducer, a sensor circuit, a test circuit, a controller and a communications circuit. The sensor circuit generates a sensor signal indicating a process variable based on a voltage across the piezoelectric transducer. The test circuit is configured to apply a voltage pulse having a pulse voltage to the piezoelectric transducer that induces a response signal, and capture peak positive and negative voltages of the response signal. The controller calculates a current condition value of the piezoelectric transducer based on the peak positive voltage, the peak negative voltage and the pulse voltage, and generates a diagnostic test result based on a comparison of the current condition value to a reference condition value corresponding to a properly operating piezoelectric transducer. The communications circuit communicates the process variable and the diagnostic test result to an external control unit over a process control loop.