Abstract: An electromagnetic flowmeter includes a board having a preamplifier circuit and a shield case mounted thereon. The preamplifier circuit amplifies an electromotive force generated between first and second electrodes disposed to be perpendicular to a magnetic field generated by an exciting coil on a measurement pipe. The preamplifier circuit includes first and second operational amplifiers, a first wiring connecting the first electrode and a non-inverting input terminal of the first operational amplifier, a second wiring connecting the second electrode and a non-inverting input terminal of the second operational amplifier, a first resistor connecting an output terminal and an inverting input terminal of the first operational amplifier, a second resistor connecting an output terminal and an inverting input terminal of the second operational amplifier, and a third resistor connecting the inverting terminals of the first and second operational amplifiers.

Abstract: An electromagnetic flowmeter for measuring a flow of liquid in a liquid-carrying line has a magnet for producing a magnetic field in the liquid-carrying line, and an electrode pair for discharging an electrical voltage when the liquid flows through the liquid-carrying line. The flowmeter enables the flow of liquid to be determined on the basis of the measured voltage. The magnet can rotate about an axis in order to produce an alternating magnetic field.

Abstract: A conduit sensor device includes first and second pairs of permanent magnets. First and second rotor shunts include first and second rotatable magnets and interposed between the first and second pairs of permanent magnets, respectively. A shunt shaft includes a first helical worm gear and a second helical worm gear mounted thereon. The first rotor shunt includes a first rotatable magnet and a first rotor gear locked together. The first helical worm gear meshing with the first rotor gear driving the first rotor gear and the first rotatable magnet. The second rotor shunt includes a second rotatable magnet and a second rotor gear locked together. The second helical worm gear meshes with the second rotor gear driving the second rotor gear and the second rotatable magnet. The surface areas of the first and second pairs of permanent magnets equals the surface area of the first and second rotatable magnets.

Abstract: A measuring electronics serves for ascertaining a potential difference (??12) between a first measuring electrode and a second measuring electrode. For such purpose, the measuring electronics comprises a reference electrode, an input circuit having two circuit inputs electrically connectable with the first, respectively second, measuring electrodes and two signal voltage outputs, a compensation circuit, a measuring and control circuit having two signal voltage inputs, two signal voltage inputs electrically and a compensation control output. The compensation circuit is adapted to provide on the first compensation voltage output a compensation voltage, namely an adjustable direct voltage referenced to the reference potential, and on the second compensation voltage output a compensation voltage, namely a direct voltage referenced to the reference potential.

Abstract: The present invention relates to a method for inhibiting in a non-aqueous, non-conductive liquid. The present method also relates to a corrosion inhibitor that can be employed in such a liquid. The method can include measuring or detecting the present corrosion inhibitor with a magnetic flow meter.

Abstract: A method for predictive maintenance for a magneto-inductive flow-measuring device and/or to a method for determining electrical conductivity of a medium flowing through a magneto-inductive flow-measuring device, wherein the magneto-inductive flow-measuring device includes a magnet system, which produces a magnetic field passing through the measuring tube essentially transversely to a measuring tube axis; at least two measuring electrodes coupled with the medium, having a defined rest potential and being arranged in a region of the measuring tube lying essentially perpendicularly to the magnetic field; and a control/evaluation unit, which delivers information concerning volume- or mass-flow of the medium on the basis of measurement voltage induced in the measuring electrodes.

Abstract: A method of manufacturing an electromagnetic flow meter assembly is disclosed. The method comprises forming an insert from a deformable material, forming at least one reinforcing component; arranging the reinforcing component around a portion of the insert, and bonding the reinforcing component to the insert to reinforce the insert against deformation under the application of pressure. An electromagnetic flow meter assembly is also disclosed and comprises an insert for insertion into a flow conduit, wherein at least a portion of the insert is formed of a deformable non-ferromagnetic material, wherein the insert comprises an inlet section, a measuring section, and an outlet section. The assembly further comprises at least one reinforcing component surrounding the measuring section of the insert to reinforce the insert against deformation under the application of pressure.

Abstract: The invention relates to a magneto-inductive flow measuring device (1), including: A measuring tube (2), through which a medium (11) flows essentially in a direction of a measuring tube axis (16); a magnet arrangement (6, 7), which produces a magnetic field (H) passing through the measuring tube (2) and extending essentially perpendicularly to the measuring tube axis (16); a first measuring electrode (3) and a second measuring electrode (4); wherein the measuring electrodes (3, 4) are positioned in the measuring tube (2) on a connecting line, which is directed essentially perpendicularly to the measuring tube axis (16) and to the magnetic field (H); and an evaluation/control unit (12), which ascertains, on the basis of a measurement voltage tapped on the measuring electrodes (3, 4), the volume- and/or mass-flow of the medium (11) through the measuring tube (2).

Abstract: A switch includes housing and a magnet that is mounted inside the housing. The magnet generates a magnetic field having magnetic flux. The switch further includes a flux concentration device that is located inside the housing and that selectively moves between first and second positions. An actuator assembly is located inside the housing and selects the first and second positions based on the input. A hall-effect device is located between the magnet and the flux concentration device and conducts a current having a first value when the magnetic flux is less than a predetermined magnetic flux threshold. The hall-effect device conducts current having a second current value when the magnetic flux exceeds the predetermined magnetic flux threshold. The first position communicates a first magnetic flux to the hall-effect device and the second position communicates a second magnetic flux that is different from the first magnetic flux to the hall-effect device.

Abstract: A magneto-inductive flow measuring device, including: A measuring tube, through which a medium flows essentially in a direction of a measuring tube axis; a magnet arrangement, which produces a magnetic field passing through the measuring tube and extending essentially perpendicularly to the measuring tube axis; a first measuring electrode and a second measuring electrode; wherein the measuring electrodes are positioned in the measuring tube on a connecting line, which is directed essentially perpendicularly to the measuring tube axis and to the magnetic field; and an evaluation/control unit, which ascertains, on the basis of a measurement voltage tapped on the measuring electrodes, the volume- and/or mass-flow of the medium through the measuring tube. In order to increase the measuring accuracy of the multi-parameter flow measuring device, the first measuring electrode is made of a first material and the second measuring electrode is made of a second material different from the first material.

Abstract: The present invention relates to a method for inhibiting in a non-aqueous, non-conductive liquid. The present method also relates to a corrosion inhibitor that can be employed in such a liquid. The method can include measuring or detecting the present corrosion inhibitor with a magnetic flow meter.

Abstract: An open circuit gravity-assisted uroflowmeter has a urine collector having a generally open inlet in fluid communication with a sensing passage located at a lower elevation than the inlet, the sensing passage intersecting a magnetic field and having electrodes for detecting a flow-dependent voltage induced by the passage of urine through the magnetic field. Preferred embodiments of the uroflowmeter may have low pressure drop, rapid response and simple construction.

Abstract: The process measuring device includes a flow sensor having a measuring tube, a sensor arrangement for producing a measurement signal, and an evaluation and operating circuit. The method serves to compensate for the effects of interfering potentials which are caused especially by foreign particles or air bubbles in the liquid to be measured. For this purpose, an anomaly in the waveform of the measurement signal caused at least in part by an electrical, especially pulse-shaped, interfering potential is detected by determining within a stored first data set a data group which digitally represents the anomaly. To generate an interference-free data set, the data belonging to the data group are removed from the stored first data set.

Abstract: A magnetic field coupler has a plurality of magnetic poles with respective first ends located immediately adjacent a circular path of a rotating magnet in a meter. The magnetic poles have respective opposite ends located immediately adjacent a magnetic sensor in a meter reading device. A nonmagnetic material separates each of the plurality of poles from all others of the plurality of the poles, and the nonmagnetic material is joined with the poles to form a unitary structure.

Abstract: In a two-wire electromagnetic flowmeter, an exciting coil generates a magnetic field in a direction perpendicular to the flowing direction of a fluid that flows through a measurement tube. A flow measuring output circuit adjusts an output current that flows to a pair of power supply lines to which an external power is supplied, in accordance with a flow measurement value obtained on the basis of a signal electromotive force which is generated in a direction perpendicular to the flowing direction of the fluid that flows through the measurement tube and the direction of the magnetic field generated from the exciting coil. An exciting circuit is connected in series with the flow measuring output circuit between the pair of power supply lines and supplies part of the output current to the exciting coil as an exciting current. In the exciting circuit, an exciting voltage circuit generates an exciting voltage between first and second lines.

Abstract: In a preferred embodiment, a sensor (10) for measuring magnitude and polarity of static charge on particles in a liquid, including: an electrically nonconductive conduit (26) through which the particles and the liquid can flow; a magnet (20) having first and second legs (22,24) with a gap therebetween, the gap being disposed in the conduit; and three electrodes (40, 42, 44) insulatedly disposed in the first leg and having distal ends protruding into the gap. A method of measuring magnitude and polarity of static charge on particles in a liquid is also provided.

Abstract: A magnetic flow meter includes a cylindrical vessel within which electrodes are placed directly opposite each other about a magnetically permeable core. In that way, two flow channels are obtained in the vessel. A common magnetic field is applied across both flow channels. The magnetic flow meter is used in conjunction with a controller which monitors amplitude modulated signals representative of applied magnetic field and induced electric field. These amplitude modulated signals are passed to Sigma-Delta modulators, which directly digitise the amplitude modulated AC signals into digital pulses. The controller is capable of monitoring reverse flow through the meter, and to store results until forward flow resumes. Moreover, the controller generates a driving signal for coils which generates a magnetic field, the coil being placed in conjunction with a capacitor which causes resonance. This reduces power consumption by the coil in driving the meter.

Abstract: An apparatus for measuring a fluid flow velocity vector including a signal generator for generating an oscillating electrical signal, an acoustic transmitter for generating an acoustic signal proportional to the oscillating electrical signal; and at least three acoustic receivers for receiving the acoustic signal and generating electrical signals which are phase shifted by the influence of the fluid flow, and a signal processor for receiving and processing the oscillating electrical signal and the electrical signals generated by the at least three acoustic receivers to determine time delays for each acoustical receiver caused by the influence of the fluid flow which are processed to determine the fluid flow velocity vector components.

Abstract: A system and method for measuring volumes and areas using electromagnetic induction techniques. A current is generated and fed into one of two coil assemblies to induce voltage into another coil assembly to provide accurate values for volume or area.