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Fluid flow meter

A fluid flow meter is provided and comprises a tubular and cylindrical housing constructed of a transparent material and having an upper axial end, a lower axial end and defining an interior fluid chamber therebetween. A fluid inlet is fluidly connected to the lower end of the chamber while a fluid outlet is fluidly connected to the upper end of the chamber. At least one and preferably several flow responsive members are disposed and freely moveable within the interior of the fluid chamber. The members have a density greater than the density of the fluid flowing through the flow meter but are vertically displaceable within the interior chamber in an amount proportional to the fluid flow rate through the flow meter. The density and surface area of the members can be varied as desired in order to provide for different flow rates and flow ranges. In addition, in the preferred form of the invention, a magnetically operated switch is adjustably connected to the housing and is actuated by the presence of a flow responsive member at a predetermined vertical level within the fluid chamber and is thus representative of a predetermined flow rate.

Flow meter

This invention relates to a flow meter of a fluidistor oscillator type, which has its principal use when measuring the ventilation of a moving human being or animal. Thanks to the special design of the flow meter it can be made small, light and portable at the same time as the pressure drop in it is minimal.

Electrodes for an electromagnetic flow meter

Electrodes for an electromagnetic flow meter are mounted through a pipe wall using pairs of concentric electrodes electrically insulated from each other and from the mounting pipeline while electrically contacting a fluid in the pipeline being measured for flow rate. The electrode pairs are held on the pipeline wall on a line intersecting the fluid flow at a right angle and are electrically connected to supply signals induced by the fluid flow to a measuring circuit. The concentric electrode structure provides two electrode pairs at each electrode site on the pipeline wall.

Flow meter

A flow-meter having a sliding lamina interposed between two chambers and movable to vary the flow therethrough in response to deviations in the pressure difference between the chambers to maintain a constant preset pressure difference for accurate measurement of instantaneous flow rates over a wide range. A cam surface relates linear variation in flow rates to non-linear variation in the area of the opening for fluid passage.


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
551 4281554 Fluid flow meter
552 4279168 Mass rate of flow meter with electromagnetic interference compensation
553 4272995 Ionization flow meter
554 4272982 Fluid flow meter for mixed liquid and gas
555 4269071 Electrodes for an electromagnetic flow meter
556 4262287 Automatic scan flow meter means
557 4248100 Mass rate of flow meter with improved magnetic circuit
558 4248099 Mass rate of flow meter with improved fluid drive
559 4244364 Combination intra-veinous flow-meter and low level fluid mechanism
560 4241613 Mass rate flow meter
561 4240294 Flow meter
562 4240292 Method for triggering ultrasonic flow meter and ultrasonic flow meter adapted for same
563 4240291 Flow meter
564 4237729 Doppler flow meter
565 4232548 Liquid flow meter
566 4228768 Air induction apparatus for use with karman vortex shedding flow meter
567 4224015 Positive displacement flow meter with helical-toothed rotors
568 4216674 Liquid flow meter
569 4212200 Instantaneous flow meter for automobile vehicles
570 4206641 Electromagnetic flow meter
571 4203820 Electrolytic cell brine flow meter
572 4201084 Vortex flow meter
573 4194394 Flow meter
574 4193301 Flow meter
575 4182172 Flow meter
576 4181013 Electrodes for an electromagnetic flow meter
577 4167873 Flow meter
578 4159645 Electromagnetic fluid flow meter with tolerance to spurious signals
579 4158360 Expiratory flow meter
580 4157035 Inductive flow meter
581 4144754 Multiphase fluid flow meter
582 4142414 Ultrasonic flow meter
583 4142412 Doppler flow meter and method
584 4140013 Flow meter
585 4137767 Electromagnetic flow meter
586 4136692 Flow meter administration device
587 4134296 Flow meter
588 4125019 Probe type electromagnetic flow meter with debris shedding capability
589 4111045 Air flow meter
590 4109523 Method of determining acoustic flow meter correction factor
591 4106337 Magnetic flow meter nulling system
592 4102187 Fluid flow meter
593 4100798 Flow meter with piezo-ceramic resistance element
594 4096747 Digital output, positive displacement flow meter
595 4089220 Fluid flow meter
596 4079626 Electromagnetic flow meter
597 4063455 Flow meter
598 4061032 Liquid flow meter or the like for corrosive liquids under pressure
599 4061031 Combination of flow meter and bubble trap
600 4056717 Temperature correction systems for a fluid flow meter

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