A magnetic-inductive flowmeter with a measuring tube for guiding an electrically conductive medium, a magnetic circuit device running outside the measuring tube for generating and guiding a magnetic field through the measuring tube, and two electrodes for tapping a measuring voltage induced in the medium. The magnetic circuit device has at least a first coil for generating the magnetic field and first and second pole piece plates, the magnetic field being formed between the pole piece plates, wherein the measuring tube is arranged between the two pole piece plates and wherein the electrodes are arranged on opposite sides of the measuring tube, an imaginary connecting line between the two electrodes running perpendicular to the direction of flow and perpendicular to the direction of the magnetic field. The magnetic field is fed into the pole piece plates by at least two feed-in regions per pole piece plate.

The present invention relates to magnetic flowmeters. More particularly, the present invention relates to a magnetic flowmeter specifically designed for the hydraulic fracturing industry that is capable of withstanding a variety of corrosive slurries, acids, bases, and solvents including a liner including partially stabilized magnesium zirconia (MgPSZ).

The present invention relates to magnetic flowmeters. More particularly, the present invention relates to a magnetic flowmeter specifically designed for the hydraulic fracturing industry that is capable of withstanding a variety of corrosive slurries, acids, bases, and solvents including a liner including partially stabilized magnesium zirconia (MgPSZ).

A flowmeter for gaseous fluid includes a conduit composed of non-electrically conductive material for passage of an ionized flow of the gaseous fluid therethrough. The flowmeter further includes an electromagnetic sensor arranged to measure a magnetic field generated about the conduit by the passage of the ionized flow and generate a signal proportional to the magnetic field.

A flowmeter for gaseous fluid includes a conduit composed of non-electrically conductive material for passage of an ionized flow of the gaseous fluid therethrough. The flowmeter further includes an electromagnetic sensor arranged to measure a magnetic field generated about the conduit by the passage of the ionized flow and generate a signal proportional to the magnetic field.

A magnetically inductive flowmeter includes a measuring tube having a tube axis and a tube wall; a magnet system for producing a magnetic field that extends perpendicularly to the tube axis; at least one pair of measuring electrodes for sensing an electrical voltage induced in the medium by the magnetic field; and an electronic measuring/operating circuit for operating the magnet system and the measuring electrodes. The magnet system includes a coil system having a coil having a coil core and further includes two pole shoes. The coil system includes a field guide-back, wherein a tangential fraction of the magnetic field in the coil relative to the measuring tube axis amounts to at least 90% of the total magnetic field. The field guide-back has a guide-back part that extends through the coil and forms the coil core of the coil.

A magnetically inductive flowmeter includes a measuring tube having a tube axis and a tube wall; a magnet system for producing a magnetic field that extends perpendicularly to the tube axis; at least one pair of measuring electrodes for sensing an electrical voltage induced in the medium by the magnetic field; and an electronic measuring/operating circuit for operating the magnet system and the measuring electrodes. The magnet system includes a coil system having a coil having a coil core and further includes two pole shoes. The coil system includes a field guide-back, wherein a tangential fraction of the magnetic field in the coil relative to the measuring tube axis amounts to at least 90% of the total magnetic field. The field guide-back has a guide-back part that extends through the coil and forms the coil core of the coil.

Disclosed is a device for measuring fill level of a liquid comprising: a measuring tube having a tube wall extending between first and second terminal openings and which surrounds a volume for guiding the liquid, wherein a tube axis extends between the two tube openings; a first conductor extending at least sectionally around the volume and is electrically insulated from the volume; a second conductor extending at least sectionally around the volume and is electrically insulated from the first conductor and from the volume, wherein the two conductors extend essentially in parallel with one another and form a waveguide for microwaves; an HF circuit for in-coupling a microwave signal into the waveguide and for receiving reflected microwave signals out-coupled from the waveguide; an operating and evaluating circuit for determining fill level of the liquid in the measuring tube based on received microwave signals.

Disclosed is a device for measuring fill level of a liquid comprising: a measuring tube having a tube wall extending between first and second terminal openings and which surrounds a volume for guiding the liquid, wherein a tube axis extends between the two tube openings; a first conductor extending at least sectionally around the volume and is electrically insulated from the volume; a second conductor extending at least sectionally around the volume and is electrically insulated from the first conductor and from the volume, wherein the two conductors extend essentially in parallel with one another and form a waveguide for microwaves; an HF circuit for in-coupling a microwave signal into the waveguide and for receiving reflected microwave signals out-coupled from the waveguide; an operating and evaluating circuit for determining fill level of the liquid in the measuring tube based on received microwave signals.

A magnetic-inductive flowmeter includes a tube, electrodes in contact with a medium in the tube, a magnetic field generator, an impedance signal generator, and a control device. A first signal path interconnects the impedance signal generator and a first electrode, and a second signal path interconnects the impedance signal generator and a second electrode. A first switch and first and third capacitors are connected such that, in a first state, only the first capacitor and, in a second state, only the third capacitor is in the first signal path. A second switch and second and fourth capacitors are connected such that, in a first state, only the second capacitor and, in a second state, only the fourth capacitor is in the second signal path. The control device sets the switches to the first state during a positive magnetic phase and to the second state during a negative magnetic phase.