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Electromagnetic flow meter

An electromagnetic flow meter for measuring the flow rate of a fluid by applying to the fluid a magnetic field generated with an exciting current and measuring the resulting signal voltage generated at a pair of electrodes; wherein the exciting current comprises two frequency components which are lower and higher than the usual commercial frequency and the signal voltage comprises two frequencies which are discriminated so that a higher frequency is extracted as a first output and a lower frequency is extracted as a second output, through a low pass filter having a large time constant. A predetermined operation, such as addition, zero correction, response correction, etc, is carried out on the first and second outputs to produce a flow rate output. The invention has quick response, stable zero point and reduced susceptibility to noises.

Flow meter support and retainer

A flow meter includes a flow channel having walls and defining a direction of flow. Stators are provided, having walls, disposed at least partially within the flow channel. A rotor is included for rotating with respect to the stator. A one piece retainer is provided for assisting in limiting axial rotor movement comprising a first pair of spaced apart wall portions for engaging the flow channel walls wherein each wall portion in the first pair of wall portions is located on a side of an axis opposite from the other. A second wall portion is located on the axis for engaging the stator wall wherein compression of each of the first pair of wall portions toward the axis results in a component of force being applied to the second wall portion along the axis.

Mass flow meter operating by the Coriolis principle

A mass flow meter operating by the Coriolis principle comprises a mechanical oscillating system having two straight measuring tubes which are clamped at both ends. The mechanical oscillating system is arranged axially in a support tube. In the center of the measuring tubes an oscillation exciter is disposed which sets the two measuring tubes into oppositely phased flexural oscillations. Oscillation sensors sensing the mechanical oscillations at equal distances on both sides of the oscillation exciter generate electrical oscillation sensor signals which are characteristic of the frequency and phase position of the sensed oscillations. An evaluation circuit receives the oscillation sensor signals and generates from their phase difference a measuring signal indicating the measured value of the mass flow. A first temperature sensor is arranged such that it measures the temperature of the support tube and generates a first temperature sensor signal indicating said temperature. A second temperature sensor is so arranged that it measures the temperature of the mechanical oscillating system and generates a second temperature sensor signal indicating said temperature. A correction circuit receives the two temperature sensor signals and imparts to the measuring signal on the basis of the temperatures measured a correction for eliminating the temperature influence on the measurement result.

Mass flow meter based on the coriolis principle

A mass flow meter based on the Coriolis principle. The meter has two rectilinear measuring tubes juxtaposed in parallel and mechanically connected at adjacent ends thereof. An oscillation generator is connected to the tubes between the ends thereof for driving the tubes in opposite directions. A sensor connected to the tubes on opposite sides of the oscillation generator sense and signal relative oscillations of the tubes which is indicative of the flow through the tubes. The measuring tubes have different bending strengths in two perpendicular axial planes thereof to reduce the amplitudes of vibration in the plane normal to the plane of interest. Individual masses applied to the measuring tubes cause the natural frequency of at least the first mechanical harmonic of the measuring tubes to differ from the natural frequency of the mechanical fundamental counter-oscillation by a factor x which differs from a whole number by at least 0.1.


Retrievable downhole flow meter
Capacitative electromagnetic flow meter
Ultrasonic flow meter with reduced noise
Coriolis mass flow meter having a thick-walled measuring tube
Detector for an ultrasonic flow meter
Karman vortex flow meter
Coriolis mass flow meter employing non-metallic flow conduit structure
Fluidic volumetric fluid flow meter
Electromagnetic flow meter
Fluid flow meter utilizing pressure sensing
Air flow meter
Fluid flow meter
Liquid flow meter construction
Positive displacement flow meter method and apparatus
Magnetic-inductive flow meter with a measuring tube made of plastic


PAT. NO. Title
401 4773274 Electromagnetic flow meter
402 4770048 Flow meter support and retainer
403 4768384 Mass flow meter operating by the Coriolis principle
404 4760744 Mass flow meter based on the coriolis principle
405 4759223 Fluid mass flow meter
406 4753111 Non-obstructive thermodynamic fluid flow meter
407 4747307 Liquid flow meter
408 4735227 Turbine flow meter viscosity control
409 4733569 Mass flow meter
410 4732160 Method of flow measurement and flow meter
411 4722232 Mass flow meter
412 4718285 Bulk flow meter
413 4718284 Bulk flow meter
414 4717159 Method and apparatus for seating and sealing a pitot tube type flow meter in a pipe
415 4716771 Symmetrical mass flow meter
416 4716770 Vortex flow meter
417 4716769 Radial field electromagnetic flow meter
418 4715225 Flow meter for measuring the flow rate of liquid
419 4709583 Electromagnetic flow meter using a pulsed magnetic field
420 4709581 Air flow meter
421 4700579 Digital flow meter for dispensing fluids
422 4686856 Mass flow meter
423 4683760 Vortex flow meter
424 4680974 Mass flow meter on the coriolis principle
425 4680973 Electromagnetic flow meter converter
426 4679442 Electromagnetic flow meter
427 4677859 Flow meter
428 4676112 Electromagnetic flow meter
429 4658657 Mass flow meter
430 4655089 Mass flow meter and signal processing system
431 4653332 Mass flow meter working on the coriolis principle
432 4649734 Apparatus and method for calibrating a flow meter
433 4646568 Flap pump-flow meter
434 4641537 Electromagnetic flow meter
435 4641536 Electromagnetic flow meter
436 4635486 Electromagnetic flow meter
437 4635485 Precession flow meter
438 4631951 Arrangement for testing a flow meter
439 4628197 Electronics for fiber optic vortex shedding flow meter
440 4627295 Vortex flow meter
441 4627294 Pulsed eddy flow meter
442 4625564 Vortex flow meter
443 4624134 Hot-wire air-flow meter
444 4619146 Flow meter
445 4619139 Flow meter with displaceable flow rate indicator
446 4614121 Electromagnetic flow meter
447 4611496 Ultrasonic flow meter
448 4594901 Electrostatic flow meter
449 4593700 Ultrasonic wave blood flow meter
450 RE32157 Flow meter prover apparatus and method

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