Abstract: A method for measuring the flow rate of a multi-phase medium flowing through a measuring tube using a nuclear magnetic resonance flow meter can be used to measure the flow rate of a multi-phase medium in a simplified manner. For this purpose, a measuring device is used which implements, at the end of each pre-magnetization path, 2D tomography in the measurement tube cross-sectional plane with stratification in the z direction; the measurement tube cross-sectional plane is subdivided into layers that are thin compared to the measurement tube diameter; nuclear magnetic resonance measurements are carried out in every layer to determine measurement signals, using pre-magnetization paths of different lengths; the flow rates are measured in every layer based on the measurement signals; and the time is determined from the signal ratios of the amplitudes of the measurement signals in every layer.

Abstract: A measuring device has a flowmeter, an inlet tube and an outlet tube. The flowmeter has a measuring tube that is connected to the inlet tube and to the outlet tube. To provide a measuring device that allows for measurements using a flowmeter, in particular of the liquid components of medium in the measuring tube, independent of whether the medium is made to flow or is stagnant, wherein the measuring tube is completely filled at least with the liquid components of the medium when the medium is stagnant the inlet tube, the measuring tube and the outlet tube form a siphon, wherein the siphon is designed and aligned in respect to the vector of the gravitational field of the earth so that, when a medium initially flows through the siphon and then the flowing of the medium stops, the measuring tube is completely filled with the stagnant medium.

Abstract: A magnetization device with a magnetic field which is generated by permanent magnets for variable magnetization of a medium flowing through a tube over a magnetization distance along the longitudinal axis of the tube. The magnetization device improves the quality of the results relative to known nuclear magnetic resonance measurement and analysis methods in that the magnetic field in the medium has a single direction over the magnetization distance.

Abstract: A nuclear magnetic flowmeter with a measuring tube through which a multiphase medium can flow and which can be connected to an inlet tube which is located in the flow direction of the medium upstream of the measuring tube and to an outlet tube which is located in the flow direction downstream of the measuring tube. The nuclear magnetic flowmeter is, first of all, characterized essentially in that a medium bypass is assigned to the measuring tube, that the medium bypass includes a bypass tube, an inlet valve and/or an outlet valve and that, for a calibration operation, the bypass tube, on the one hand, can be connected to the inlet tube, and on the other hand, to the outlet tube, specifically via the inlet valve, via the outlet valve or via the inlet valve and via the outlet valve.

Abstract: A nuclear magnetic flowmeter (1) for determining the flow of a medium flowing through a measuring tube (2) having a magnetic field generator (4), a measuring unit (5) and an antennae unit (6) with an antenna (7). wherein the antennae unit (6) has at least one further antenna (11, 12), that is designed as a coil and is designed for transmitting the excitation signal to the magnetized medium (3) and for detecting the measuring signal over a further measuring section (13, 14) aligned parallel to the longitudinal axis (8) of the measuring tube and located in the magnetic field path (9), and the measuring section (10) and the further measuring section (13, 14) are different.

Abstract: A method for operating a nuclear magnetic flowmeter for determining the flow of a slug flow medium flowing through a measuring tube, with which “tuning” parameters and “matching” parameters are set for a slug zone a film zone, reflected power is measured over time. If the reflected power in a system set for slug zone is low for the slug zone and high for the film zone and if the reflected power in a system set for film zone is low for the film zone and high for the slug zone, relative dwell time of the slug zone and the film zone in the RF coil and the relative frequency of the slug zones and film zones in the flowing medium are determined using the reflected power with a jump in the value of the reflected power from a high value to a lower value used to trigger measurement initiation.

Abstract: A nuclear magnetic flowmeter (1) for determining the flow of a medium flowing through a measuring tube (2), having a magnetic field generator (3) having permanent magnets for generating a magnetic field interfusing the medium over a magnetic field section LM, having a pre-magnetization section LM located within the magnetic field section LM and having a measuring device also located in the magnetic field section LM including a coil-shaped antenna (4) with the length L1 serving as a measuring antenna. At least one coil-shaped antenna (5) is provided in the pre-magnetization section LVM for generating a pulse or pulse sequence spoiling the magnetization of the medium in the direction of the magnetic field.

Abstract: A method for operating a nuclear magnetic flowmeter having a measuring device for determining the flow of the medium through the measuring tube, the measuring device having a magnetic field generator for generating a magnetic field permeating the medium and the measuring tube and for carrying out nuclear magnetic measurements of measuring volumes that are adjustable in position and size in the magnetic field. The nuclear magnetic measurements involve adjusting the size of the measuring volume, positioning the measuring volume, generating excitation signals for exciting the medium, transmitting excitation signals into the measuring volume and measuring echo signals caused by the excitation signals. Deposits on the inner wall of the measuring tube are determined from echo signals of all nuclear magnetic measurements assigned to the position of the measuring volume of the respective nuclear magnetic measurement and at least one abrupt change in the echo signals detected.

Abstract: A flowmeter for determining the flow of a multi-phase medium through a measuring tube has a first and a second measuring device, one of which operates on a tomographic measuring principle and one of uses a measuring principle based on nuclear magnetic resonance. The first measuring device operates in a different manner from the second measuring device, e.g., using a measuring device operating on the measuring principle of pre-magnetization contrast measurement and having a pre-magnetization section with a constant magnetic field. The magnetic field has at least one component perpendicular to the direction of flow of the multi-phase medium and is generated by using magnetic field generating elements, which are arranged around the measuring tube. Additionally, an assembly for exciting nuclear spin by a RF excitation pulse or a RF excitation pulse sequence is part of the measuring device.

Abstract: A magnetization device with a magnetic field which is generated by permanent magnets for variable magnetization of a medium flowing through a tube over a magnetization distance along the longitudinal axis of the tube. The magnetization device improves the quality of the results relative to known nuclear magnetic resonance measurement and analysis methods in that the magnetic field in the medium has a single direction over the magnetization distance.

Abstract: A nuclear magnetic flowmeter with a measuring tube through which a multiphase medium can flow and which can be connected to an inlet tube which is located in the flow direction of the medium upstream of the measuring tube and to an outlet tube which is located in the flow direction downstream of the measuring tube. The nuclear magnetic flowmeter is, first of all, characterized essentially in that a medium bypass is assigned to the measuring tube, that the medium bypass includes a bypass tube, an inlet valve and/or an outlet valve and that, for a calibration operation, the bypass tube, on the one hand, can be connected to the inlet tube, and on the other hand, to the outlet tube, specifically via the inlet valve, via the outlet valve or via the inlet valve and via the outlet valve.

Abstract: An ultrasonic flowmeter with a measuring tube through which flows a medium and which, viewed in cross section, has a split circumference forming two halves with two ultrasonic converter pairs, each with an associated ultrasound reflector. The converters of each pair are mounted on a common circumferential half in a mutually offset position as viewed in the longitudinal direction of the tube, while the reflector for each pair is positioned on the other, opposite circumferential half in the longitudinal direction of the measuring tube between the two converters, so that an ultrasound signal emitted by one converter of a pair travels along a V-shaped signal path via the reflector of the associated pair to the other converter of that pair. The first pair and the second reflector are positioned on one circumferential half of the tube while the second pair and the first reflector are positioned on the other, opposite circumferential half of the tube.

Abstract: A process and device for mounting a clamp-on flow rate measurement device on a measurement pipe using a mounting device having a holding strap with catches. The holding strap can be fastened on the measurement pipe by the holding strap being guided into and through the catch and tightened. A holder is attached to the holding strap to which the clamp-on flow rate measurement device can be fastened. First the mounting device is mounted on the measurement pipe, afterwards the clamp-on flow rate measurement device is attached to the holder without the holding strap being completely tensioned, so that the clamp-on flow rate measurement device is loosely held on the measurement pipe. Then, after aligning the clamp-on flow rate measurement device is, the clamp-on flow rate measurement device is completely attached to the holding means by further tensioning of the holding strap by lifting the catch off the measurement pipe.

Abstract: A clamp-on measurement device, for attachment to a support, with at least one instrument transformer, a retaining device for holding the instrument transformer and a fastening device (4) for attachment of the retaining means to the support. The retaining device can be attached to the fastening device (4) such that the retaining device can be moved in at least one predetermined direction away from or toward the support and can be pivoted along a pivot axis which runs preferably perpendicular to the predetermined direction. This results in the clamp-on measurement device, after attachment to a support, being easily disengaged from the support for maintenance and repair purposes and then can be reengaged with the support without losing its original alignment.

Abstract: An ultrasonic flowmeter with a measuring tube through which flows a medium and which, viewed in its cross section, has a split circumference forming two halves and with two ultrasonic converter pairs, each with an associated ultrasound reflector. The converters of each converter pair are mounted on a common circumferential half in a mutually offset position as viewed in the longitudinal direction of the tube, while the reflector for each converter pair is positioned on the other, opposite circumferential half in the longitudinal direction of the measuring tube between the two converters, so that an ultrasound signal emitted by one converter of a converter pair travels along a V-shaped signal path via the reflector of the associated converter pair to the other converter of that converter pair.

Abstract: A transmitting and/or receiving head for a sonic flowmeter measuring moving fluids by the runtime method, with an enclosure, an ultrasonic transducer transmitting ultrasound signals into and/or receiving ultrasound signals from the moving fluid and with an ultrasound waveguide by way of which the ultrasound signals are injected into and/or extracted from the moving fluid. The transmitting and/or receiving head is particularly well suited to utilization in a sonic flowmeter for very hot fluids, especially hot gases, by virtue of the fact that it employs an ultrasound waveguide in the form of an elongated sonic funnel offering high thermal conduction resistance.

Abstract: A transmitting and/or receiving head for a sonic flowmeter measuring moving fluids by the runtime method, with an enclosure, an ultrasonic transducer transmitting ultrasound signals into and/or receiving ultrasound signals from the moving fluid and with an ultrasound waveguide by way of which the ultrasound signals are injected into and/or extracted from the moving fluid. The transmitting and/or receiving head is particularly well suited to utilization in a sonic flowmeter for very hot fluids, especially hot gases, by virtue of the fact that it employs an ultrasound waveguide in the form of an elongated sonic funnel offering high thermal conduction resistance.