Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow

GPHYSICS G01Measuring instruments G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL METERING BY VOLUME

G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow

G01F1/002specially adapted to be used in open channels G01F1/005using floats G01F1/007by measuring the level variations of storage tanks relative to the time G01F1/05by using mechanical effects G01F1/053using rotating vanes with tangential and axial admission G01F1/056Orbital ball flowmeters G01F1/06using rotating vanes with tangential admission G01F1/065with radiation as transfer means to the indicating device G01F1/07with mechanical coupling to the indicating device G01F1/075with magnetic or electromagnetic coupling to the indicating device G01F1/0755with magnetic coupling only in a mechanical transmission path G01F1/08Adjusting, correcting or compensating means therefor G01F1/10using rotating vanes with axial admission G01F1/103with radiation as transfer means to the indicating device G01F1/106with electrostatic coupling to the indicating device G01F1/11with mechanical coupling to the indicating device G01F1/115with magnetic or electromagnetic coupling to the indicating device G01F1/1155with magnetic coupling only in a mechanical transmission path G01F1/12Adjusting, correcting, or compensating means therefor G01F1/125with electric, electro-mechanical or electronic means G01F1/20by detection of dynamic effects of the fluid flow G01F1/203Jet stream flowmeters G01F1/206Measuring pressure, force or momentum of a fluid flow which is forced to change its direction G01F1/22by variable-area meters G01F1/24with magnetic or electric coupling to the indicating device G01F1/26of the valve type G01F1/28by drag-force G01F1/30for fluent solid material G01F1/32by swirl flowmeter G01F1/3209using Karmann vortices G01F1/3218bluff body design G01F1/3227using fluidic oscillators G01F1/3236using guide vanes as swirling means G01F1/3245detection means for swirl flowmeters G01F1/3254for detecting fluid pressure oscillations G01F1/3263by sensing mechanical vibrations G01F1/3272for detecting fluid speed oscillations by thermal sensors G01F1/3281for detecting variations in infrasonic, sonic or ultrasonic waves, due to modulation by passing through the swirling fluid G01F1/329circuits therefore G01F1/34by measuring pressure or differential pressure G01F1/36the pressure or differential pressure being created by the use of flow constriction G01F1/363with electrical or electro-mechanical indication G01F1/366with mechanical or fluidic indication G01F1/37the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels G01F1/372with electrical or electro-mechanical indication G01F1/375with mechanical or fluidic indication G01F1/377using a ring-balance as indicating element G01F1/38the pressure or differential pressure being measured by means of a movable element G01F1/383with electrical or electro-mechanical indication G01F1/386with mechanical or fluidic indication G01F1/40Details or construction of the flow constriction devices G01F1/42Orifices or nozzles G01F1/44Venturi tubes G01F1/46Pitot tubes G01F1/48the pressure of differential pressure being created by a capillary element G01F1/50Correcting or compensating means G01F1/52by measuring the height of the fluid level due to the lifting powder of the fluid flow G01F1/54by means of chains, flexible bands or wires introduced into and moved by the flow G01F1/56by using electric or magnetic effects G01F1/58by electro-magnetic flowmeters G01F1/582without electrodes G01F1/584constructions of electrodes, accessories therefor G01F1/586constructions of coils, magnetic circuits, accessories therefor G01F1/588combined constructions of electrodes, coils or magnetic circuits, accessories therefor G01F1/60Circuits therefor G01F1/64by measuring electrical current passing through the fluid flow measuring electrical potential generated by the fluid flow G01F1/66by measuring frequency, phaseshift, or propagation time of electro-magnetic or other waves G01F1/661using light G01F1/662Constructional details G01F1/663by measuring Doppler frequency shift G01F1/665of the drag-type G01F1/666by detecting noise and sounds generated by the flowing fluid G01F1/667Schematic arrangements of transducers of ultrasonic flowmeters; Circuits therefor G01F1/668Compensating or correcting for variations in velocity of sound G01F1/68by using thermal effects G01F1/684Structural arrangements Mounting of elements G01F1/6842with means for influencing the fluid flow G01F1/6845Micro-machined devices G01F1/6847where sensing or heating elements are not disturbing the fluid flow G01F1/688using a particular type of heating, cooling or sensing element G01F1/6882making use of temperature dependence of acoustic properties G01F1/6884making use of temperature dependence of optical properties G01F1/6886Pyroelectric elements G01F1/6888Thermoelectric elements G01F1/69of resistive type G01F1/692Thin-film arrangements G01F1/696Circuits therefor G01F1/6965comprising means to store calibration data for flow signal calculation or correction G01F1/698Feedback or rebalancing circuits G01F1/6983adapted for burning-off deposits G01F1/6986with pulsed heating G01F1/699by control of a separate heating or cooling element G01F1/704using marked regions or existing inhomogeneities within the fluid stream G01F1/7042using radioactive tracers G01F1/7044using thermal tracers G01F1/7046using electrical loaded particles as tracer G01F1/7048the concentration of electrical loaded particles giving an indication of the flow G01F1/708Measuring the time taken to traverse a fixed distance G01F1/7082using acoustic detecting arrangements G01F1/7084using thermal detecting arrangements G01F1/7086using optical detecting arrangements G01F1/7088using electrical loaded particles as tracers G01F1/712using auto-correlation or cross-correlation detection means G01F1/716using electron paramagnetic resonance [EPR] or nuclear magnetic resonance [NMR] G01F1/72Devices for measuring pulsing fluid flows G01F1/74Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid G01F1/76Devices for measuring mass flow of a fluid or a fluent solid material G01F1/78Direct mass flowmeters G01F1/785using fluidic bridge circuits G01F1/80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted G01F1/82using a driven wheel as impeller and one or more other wheels or moving elements which are angularly restrained by a resilient member G01F1/84Gyroscopic mass flowmeters G01F1/8404details of flowmeter manufacturing methods G01F1/8409constructional details G01F1/8413means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments G01F1/8418motion or vibration balancing means G01F1/8422exciters G01F1/8427detectors G01F1/8431electronic circuits G01F1/8436signal processing G01F1/844micro-fluidic or miniaturised flowmeters G01F1/8445micro-machined flowmeters G01F1/845arrangements of measuring means, e.g., of measuring conduits G01F1/8454rotating or rotatingly suspended measuring conduits G01F1/8459vibrating means being located inside the measuring conduits G01F1/8463the measuring conduits' cross-section being deformed during measurement G01F1/8468vibrating measuring conduits G01F1/8472having curved measuring conduits G01F1/8477with multiple measuring conduits G01F1/8481having loop-shaped measuring conduits G01F1/8486with multiple measuring conduits G01F1/849having straight measuring conduits G01F1/8495with multiple measuring conduits G01F1/86Indirect mass flowmeters G01F1/88with differential pressure measurement to determine the volume flow G01F1/90with positive displacement meter or turbine meter to determine the volume flow