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Karman vortex flow meter

A Karman vortex flow meter in which a main passage 1 and a bypass passage 2 are adjacent to each other; a throttle portion 12 is formed at the inlet of the bypass passage to continuously reduce the cross-sectional surface area of the passage, and a flared portion 14 is formed in the bypass passage 2 so that the cross-sectional surface area of the passage is continuously enlarged from an intermediate portion of the passage to the outlet of it. Further, the inlets and the outlets of the main passage and the bypass passage are each arranged in single planes perpendicular to the flow direction of the fluid to be measured, and the boundary portions 16 17 between the main passage and the bypass passage 2 are respectively formed to have a smallest thickness.

Membrane for a fluid flow meter

A fluid flow meter has a housing with a fluid inlet and a fluid outlet and defining therebetween a fluid flow path. The flow meter has a flexible membrane having a inlet end mounted at an inlet region of the fluid flow path and a outlet end mounted at an outlet region of the fluid flow path. The flexible membrane produces undulating motion in response to fluid flow in the fluid flow path. Fluid flow rate is measured by sensing the undulating motion of the membrane. Performance of the meter is enhanced by laminating a layer of material to the membrane.

Flow meter

The flow meter has in a substantially cylindrical inner housing (1) a helically designed diffuser (4), which imparts a swirl to the medium flowing through the inner housing. Downstream of the diffuser there is rotatably mounted a rotor (8), which has blades (13) extending from its rotational spindle (9) as well as a ring (14) which connects the blade ends to one another and is coaxial to the spindle. The rotor (8) is set in rotation by impingement of the blades (13) by the flowing medium. On the outer circumferential surface (15) of the ring (11) there is on a circular line a multiplicity of markings (16) arranged at equal angular intervals from one another. Through a window (18) in the inner housing (1), a light beam strikes the outer circumferential surface (15) of the ring (14), provided with the markings (16). Upon rotation of the rotor (8), the sequence of markings is transmitted by an optical-fibre cable (20) and sensed by a sensor (21), so that from the signals received the flow rate can be determined. The flow meter has the advantage that the medium to be measured does not have to be transparent as in the application of the light barrier and that the multiplicity of markings allows an increase in the measuring accuracy.

Mass flow meter

A mass flow meter for flowing media which works on the Coriolis Principle includes a straight measuring pipe carrying the flow medium, an oscillator acting on the measuring pipe and two transducers detecting Coriolis forces and/or Coriolis oscillations based on Coriolis forces. The meter also has a carrier pipe holding the measuring pipe, the oscillator and the transducers and two temperature sensors that detect the temperature of the measuring pipe and correct the measured value depending on the temperature of the measuring pipe. The measuring pipe and the carrier pipe are connected to one another in a way that excludes relative axial movements, and the axial distance between the connecting points of the measuring pipe carrier pipe represents the oscillation length of the measuring pipe. The mass flow meter is designed so that, in a simple way, the measured value is largely independent from temperature changes and from forces acting from the outside and so that a length-change sensor that detects changes in the oscillation length of the measuring pipe can correct the measured value depending on the oscillation length of and stress on the measuring pipe.


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
251 5398548 Karman vortex flow meter
252 5390542 Membrane for a fluid flow meter
253 5388466 Flow meter
254 5381697 Mass flow meter
255 5381691 Air flow meter
256 5373851 Specialized peak flow meter
257 5370002 Apparatus and method for reducing stress in the brace bar of a Coriolis effect mass flow meter
258 5367906 Hot wire air flow meter
259 5365794 Mass flow meter
260 5363704 Fluidic oscillator and a flow meter including such an oscillator
261 5351561 Coriolis-type flow meter having an improved temperature range of operation
262 5351560 Ultrasonic flow meter
263 5347862 Fluid flow meter
264 5337617 Gas flow meter
265 5337603 Elbow mass flow meter
266 5327787 Electromagnetic flow meter with weir
267 5325728 Electromagnetic flow meter
268 5325712 Air flow meter
269 5324111 Steam flow meter
270 5315862 Flow meter
271 5313843 Karman vortex flow meter
272 5313833 Milk flow meter
273 5301557 Stability coriolis mass flow meter
274 5295396 Positive displacement piston flow meter for air flow measurement
275 5293866 Oxygen flow meter indicator
276 5291792 Mass flow meter
277 5287754 Mass flow meter
278 5261407 Ultrasonic doppler blood-flow meter
279 5259239 Hydrocarbon mass flow meter
280 5253537 Magnetic flow meter
281 5253533 Mass flow meter
282 RE34403 Hot-wire type air flow meter and an internal combustion engine with the same
283 5251149 Electronic nutating disc flow meter
284 5243859 Thermo-type air flow meter
285 5237281 Ion drag air flow meter
286 5231871 Hot-electrical-resistance type gas flow meter and internal combustion engine with hot-electrical-resistance type gas flow meter
287 5230245 Flow meter and measuring method therefor
288 5226319 Hot wire air flow meter
289 5224487 Portable peak flow meter
290 5220830 Compact gas flow meter using electronic microsensors
291 5209114 Reciprocating piston flow meter
292 5209113 Air flow meter
293 5201581 Method and apparatus for measuring mass flow and energy content using a linear flow meter
294 5201216 Air flow meter for internal combustion engines and a manufacturing method thereof
295 5197336 Karman vortex flow meter
296 5193389 Reciprocating piston positive displacement flow meter
297 5191793 Fluid mass flow meter device with reduced attitude sensitivity
298 5184519 High resolution flow meter
299 5181420 Hot wire air flow meter
300 5179858 Mass air flow meter

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