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Flow meter

A fluid flow meter is disclosed which can generate both an electrical and a mechanical representation of flow rate. A first magnet, mounted within a flow tube, is displaced in response to fluid flow in the flow tube. A second magnet, mounted outside the flow tube, moves in response to changes in the magnetic coupling between the first magnet and the second magnet caused by displacement of the first magnet within the flow tube. A pointer is coupled to the second magnet and moves with the second magnet to produce a visual representation of flow rate. A sensor, mounted in proximity to the second magnet, and responsive to movement of the second magnet, produces an electrical signal representative of the flow rate.

Vortex flow meter

A vortex flow meter comprises a first diaphragm which divides first and second pressure chambers from each other; a second diaphragm which divides third and fourth pressure chambers from each other and is disposed in such a manner that the direction in which the second diaphragm is movable is coincident with that in which the first diaphragm is movable, and that the direction is not coincident with that of the maximum component of an external force which acts on the diaphragms; first and second bridge circuits which make outputs in response to the action of the first and second diaphragms, respectively; and differential amplifiers which perform the differential amplification of the outputs from the first and second bridge circuits.

Fluidic volumetric fluid flow meter

Fluidic volumetric flow meter method and apparatus wherein undesirable dynamic interaction (ringing) which could appear in an output signal is inhibited. Electrical isolation and shielding also contribute to a high quality output signal in accordance with the invention. Particularly advantageous housing structures adapt the flow measurement device to a variety of applications as a complete flow meter.

Method of measuring flow rate and flow meter for use in said method as well as apparatus for controlling flow rate of liquid using said flow meter

A part of a tube, through which a fluid passes, is cooled by means of an electronic cooling element and a flow rate of the fluid is measured on the basis of a temperature of a surface of the tube cooled. Not only can the flow rate of the liquid flowing through the tube be determined in a noncontacting manner and a very small flow rate of the liquid be determined, but also the tube is cooled so that no bubbles are generated, and thus the measurment of the liquid, which is apt to generate gases, such as low boiling point liquid, is possible. In addition, the measurement is not influenced by the gases dissolved in the liquid and merely the temperature difference resulting from the flow of the fluid, that is, the rise of the temperature of the fluid, is detected to prevent the measurement from being influenced by the installing posture of the flow meter, so that a highly accurate measurement is possible. Consequently, stable and sure controlling flow rate of liquid is possible.


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
351 4949755 Fluidic volumetric fluid flow meter
352 4949583 Method of mass flow measurement by the coriolis principle and mass flow meter operating by the coriolis principle
353 4947889 Method of measuring flow rate and flow meter for use in said method as well as apparatus for controlling flow rate of liquid using said flow meter
354 4944190 Flow meter
355 4938074 Vortex flow meter
356 4938061 Current controlled electronic circuit for a hot wire air flow meter
357 4936151 Paddle-wheel type flow meter
358 4934187 Flow meter for insertion in aquarium filter flow tube
359 4930357 Fluidic volumetric fluid flow meter
360 4926532 Method of manufacturing a flow meter
361 4922759 Vortex frequency flow meter
362 4920794 Fluid flow meter
363 4911018 Flow meter bracket
364 4911009 Thermal air flow meter
365 4907459 Vortex flow meter
366 4906165 Flow meter for a positive displacement pump
367 4905509 Hot wire air flow meter arrangement for monitoring intake air flow rate in internal combustion engine
368 4905206 Ultrasonic doppler flow meter
369 4898525 Motor, pump and flow meter with a planetary system
370 4896542 Portable wastewater flow meter
371 4891989 Vortex flow meter
372 4887577 Hot-wire type air flow meter and an internal combustion engine with the same
373 4872352 Flow meter pulse transmitter
374 RE33076 Air flow meter circuit with temperature compensation circuit
375 4864870 Analog flow meter instrument
376 4856348 Flow meter turbine
377 4854177 Piezoelectric vortex flow meter
378 4851666 Optical flow meter
379 4848164 Liquid flow meter
380 4845984 Temperature compensation for a thermal mass flow meter
381 4843445 Integrated semiconductor circuit and method for producing it, and use of such a circuit for providing a flow meter
382 4840072 Variable orifice flow meter
383 4838127 Ultrasonic flow meter
384 4838092 Vortex flow meter
385 4836021 Fluid flow meter
386 4829814 Hot film type air flow meter
387 4827767 Flow meter
388 4825705 Mass flow meter with equipment for determination of the coriolis force
389 4825703 Electromagnetic flow meter
390 4821557 Method and apparatus for determining the accuracy of a gas flow meter
391 4813280 Thermal pulse flow meter with disposable cell
392 4809703 Ultrasonic doppler blood flow meter
393 4793192 Electromagnetic pulse receiver for a flow meter
394 4793191 Mass flow meter operating by the cariolis principle
395 4790182 Hot wire air flow meter
396 4790181 Thermal mass flow meter and method of making same
397 4790178 Intake structure of internal combustion engine with bypass intake passage for mounting air flow meter
398 4787254 Mass flow meter
399 4787253 Electronic display flow meter
400 4782710 Karman vortex flow meter

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