G01F

MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL

METERING BY VOLUME

Attention is drawn to the Notes following the title of class G01.

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

G01F1/00

Measuring volume flow

G01F1/00

Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow measuring a proportion of the volume flow G01F5/00

Groups G01F1/704 - G01F1/76 take precedence over groups G01F1/05 - G01F1/68.

G01F1/002

wherein the flow is in an open channel

G01F1/005

using floats

G01F1/007

by measuring the level variations of storage tanks relative to the time

G01F1/05

by using mechanical effects

G01F1/053

using rotating vanes with tangential and axial admission

G01F1/056

Orbital ball flowmeters

G01F1/06

using rotating vanes with tangential admission

G01F1/065

with radiation as transfer means to the indicating device, e.g. light transmission

G01F1/07

with mechanical coupling to the indicating device

G01F1/075

with magnetic or electromagnetic coupling to the indicating device

G01F1/0755

with magnetic coupling only in a mechanical transmission path

G01F1/08

Adjusting, correcting or compensating means therefor

G01F1/10

using rotating vanes with axial admission

G01F1/103

with radiation as transfer means to the indicating device, e.g. light transmission

G01F1/106

with electrostatic coupling to the indicating device

G01F1/11

with mechanical coupling to the indicating device

G01F1/115

with magnetic or electromagnetic coupling to the indicating device

G01F1/1155

with magnetic coupling only in a mechanical transmission path

G01F1/12

Adjusting, correcting, or compensating means therefor

G01F1/125

with electric, electro-mechanical or electronic means

G01F1/20

by detection of dynamic effects of the flow

G01F1/203

Jet stream flowmeters

G01F1/206

Measuring pressure, force or momentum of a fluid flow which is forced to change its direction

G01F1/22

by variable-area meters

, e.g. rotameters

G01F1/24

with magnetic or electric coupling to the indicating device

G01F1/26

of the valve type

G01F1/28

by drag-force, e.g. vane type or impact flowmeter

G01F1/30

for fluent solid material

G01F1/32

using swirl flowmeters

G01F1/3209

using Karman vortices

G01F1/3218

bluff body design

G01F1/3227

using fluidic oscillators fluidic oscillators per se

F15C1/00

G01F1/3236

using guide vanes as swirling means

G01F1/325

Means for detecting quantities used as proxy variables for swirl

G01F1/3259

for detecting fluid pressure oscillations

G01F1/3266

by sensing mechanical vibrations

G01F1/3273

for detecting fluid speed oscillations by thermal sensors

G01F1/3282

for detecting variations in infrasonic, sonic or ultrasonic waves, due to modulation by passing through the swirling fluid

G01F1/3287

circuits therefor

G01F1/34

by measuring pressure or differential pressure

G01F1/36

the pressure or differential pressure being created by the use of flow constriction

G01F1/363

with electrical or electro-mechanical indication G01F1/37 and G01F1/38 take precedence

G01F1/366

with mechanical or fluidic indication G01F1/37 and G01F1/38 take precedence

G01F1/37

the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels, e.g. by U-tubes

G01F1/372

with electrical or electro-mechanical indication

G01F1/375

with mechanical or fluidic indication

G01F1/377

using a ring-balance as indicating element

G01F1/38

the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule

G01F1/383

with electrical or electro-mechanical indication

G01F1/386

with mechanical or fluidic indication

G01F1/40

Details of construction of the flow constriction devices

G01F1/42

Orifices or nozzles

G01F1/44

Venturi tubes

G01F1/46

Pitot tubes

G01F1/48

the pressure or differential pressure being created by a capillary element

G01F1/50

Correcting or compensating means

G01F1/52

by measuring the height of the fluid level due to the lifting power of the fluid flow

G01F1/54

by means of chains, flexible bands or wires introduced into and moved by, the flow

G01F1/56

by using electric or magnetic effects G01F1/66 takes precedence

G01F1/58

by electromagnetic flowmeters

G01F1/582

without electrodes

G01F1/584

constructions of electrodes, accessories therefor

G01F1/586

constructions of coils, magnetic circuits, accessories therefor G01F1/582 takes precedence; magnet; inductances; transformers; selection of materials for their magnetic properties per se

H01F

G01F1/588

combined constructions of electrodes, coils or magnetic circuits, accessories therefor

G01F1/60

Circuits therefor

G01F1/64

by measuring electrical currents passing through the fluid flow

measuring electrical potential generated by the fluid flow, e.g. by electrochemical, contact or friction effects G01F1/58 takes precedence

G01F1/66

by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters

G01F1/661

using light

G01F1/662

Constructional details

G01F1/663

by measuring Doppler frequency shift

G01F1/665

of the drag-type

G01F1/666

by detecting noise and sounds generated by the flowing fluid

G01F1/667

Arrangements of transducers for ultrasonic flowmeters

Circuits for operating ultrasonic flowmeters

G01F1/668

Compensating or correcting for variations in velocity of sound

G01F1/68

by using thermal effects

G01F1/684

Structural arrangements

Mounting of elements, e.g. in relation to fluid flow

G01F1/6842

with means for influencing the fluid flow

G01F1/6845

Micromachined devices

G01F1/6847

where sensing or heating elements are not disturbing the fluid flow, e.g. elements mounted outside the flow duct

G01F1/688

using a particular type of heating, cooling or sensing element

G01F1/6847 takes precedence

G01F1/6882

making use of temperature dependence of acoustic properties, e.g. propagation speed of surface acoustic waves

G01F1/6884

making use of temperature dependence of optical properties

G01F1/6886

Pyroelectric elements

G01F1/6888

Thermoelectric elements, e.g. thermocouples, thermopiles

G01F1/69

of resistive type

G01F1/692

Thin-film arrangements

G01F1/696

Circuits therefor, e.g. constant-current flow meters

G01F1/6965

comprising means to store calibration data for flow signal calculation or correction

G01F1/698

Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters

G01F1/6983

adapted for burning-off deposits

G01F1/6986

with pulsed heating, e.g. dynamic methods

G01F1/699

by control of a separate heating or cooling element

G01F1/704

using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter G01F1/76, G01F25/00 take precedence

G01F1/7042

using radioactive tracers

G01F1/7044

using thermal tracers

G01F1/7046

using electrical loaded particles as tracer, e.g. ions or electrons

G01F1/7048

the concentration of electrical loaded particles giving an indication of the flow

G01F1/708

Measuring the time taken to traverse a fixed distance

G01F1/7082

using acoustic detecting arrangements

Group G01F1/7082 is impacted by reclassification into group G01F1/712.
Groups G01F1/7082 and G01F1/712 should be considered in order to perform a complete search.

G01F1/7084

using thermal detecting arrangements

Group G01F1/7084 is impacted by reclassification into group G01F1/712. Groups G01F1/7084 and G01F1/712 should be considered in order to perform a complete search.

G01F1/7086

using optical detecting arrangements

Group G01F1/7086 is impacted by reclassification into group G01F1/712.
Groups G01F1/7086 and G01F1/712 should be considered in order to perform a complete search.

G01F1/7088

using electrically charged particles as tracers

Group G01F1/7088 is impacted by reclassification into group G01F1/712.
Groups G01F1/7088 and G01F1/712 should be considered in order to perform a complete search.

G01F1/712

using auto-correlation or cross-correlation detection means

Group G01F1/712 is incomplete pending reclassification of documents from groups G01F1/7082, G01F1/7084, G01F1/7086 and G01F1/7088.
All groups listed in this Warning should be considered in order to perform a complete search.

G01F1/716

using electron paramagnetic resonance [EPR] or nuclear magnetic resonance [NMR]

G01F1/72

Devices for measuring pulsing fluid flows

G01F1/74

Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid

G01F1/76

Devices for measuring mass flow of a fluid or a fluent solid material

G01F1/78

Direct mass flowmeters

G01F1/785

using fluidic bridge circuits

G01F1/80

operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted

G01F1/82

using a driven wheel as impeller and one or more other wheels or moving elements which are angularly restrained by a resilient member, e.g. spring member as the measuring device

G01F1/84

Coriolis or gyroscopic mass flowmeters

G01F1/8404

details of flowmeter manufacturing methods

G01F1/8409

constructional details

G01F1/8413

means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments

G01F1/8418

motion or vibration balancing means

G01F1/8422

exciters

G01F1/8427

detectors

G01F1/8431

electronic circuits

G01F1/8436

signal processing

G01F1/844

microfluidic or miniaturised flowmeters

G01F1/8445

micromachined flowmeters

G01F1/845

arrangements of measuring means, e.g., of measuring conduits

G01F1/8454

rotating or rotatingly suspended measuring conduits

G01F1/8459

vibrating means being located inside the measuring conduits

G01F1/8463

the measuring conduits' cross-section being deformed during measurement, e.g. by periodically deflecting a portion of the conduits' surface

G01F1/8468

vibrating measuring conduits

G01F1/8472

having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane G01F1/8481 takes precedence

G01F1/8477

with multiple measuring conduits

G01F1/8481

having loop-shaped measuring conduits, e.g. the measuring conduits form a loop with a crossing point

G01F1/8486

with multiple measuring conduits

G01F1/849

having straight measuring conduits

G01F1/8495

with multiple measuring conduits

G01F1/86

Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure

G01F1/88

with differential-pressure measurement to determine the volume flow

G01F1/90

with positive-displacement meter or turbine meter to determine the volume flow

G01F3/00

Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow measuring a proportion of the volume flow G01F5/00

G01F3/02

with measuring chambers which expand or contract during measurement

G01F3/04

having rigid movable walls

G01F3/06

comprising members rotating in a fluid-tight or substantially fluid-tight manner in a housing

G01F3/065

sliding-vane meters

G01F3/08

Rotary-piston or ring-piston meters

G01F3/10

Geared or lobed impeller meters

G01F3/12

Meters with nutating members, e.g. discs

G01F3/14

comprising reciprocating pistons, e.g. reciprocating in a rotating body

G01F3/16

in stationary cylinders

G01F3/18

involving two or more cylinders

G01F3/20

having flexible movable walls, e.g. diaphragms, bellows

G01F3/22

for gases

G01F3/221

Valves therefor valves for flowmeters in general G01F15/005

G01F3/222

characterised by drive mechanism for valves or membrane index mechanism

G01F3/223

with adjustment of stroke or timing; Calibration thereof; Testing

G01F3/224

with means for pressure or temperature compensation

G01F3/225

characterised by constructional features of membranes or by means for improving proper functioning of membranes diaphragms for flowmeters in general G01F15/16

G01F3/226

characterised by features of meter body or housing

G01F3/227

characterised by the means for transfer of membrane movement information to indicating means

G01F3/228

using mechanical transmission means

G01F3/24

with measuring chambers moved during operation wet gas-meters G01F3/30

G01F3/26

Tilting-trap meters

G01F3/28

on carriers rotated by the weight of the liquid in the measuring chambers

G01F3/30

Wet gas-meters

G01F3/32

comprising partitioned drums rotating or nutating in a liquid

G01F3/34

comprising bells reciprocating in a liquid

G01F3/36

with stationary measuring chambers having constant volume during measurement with measuring chambers which expand or contract during measurement G01F3/02

G01F3/38

having only one measuring chamber

G01F5/00

Measuring a proportion of the volume flow

G01F5/005

by measuring pressure or differential pressure, created by the use of flow constriction

G01F7/00

Volume-flow measuring devices with two or more measuring ranges

Compound meters

G01F7/005

by measuring pressure or differential pressure, created by the use of flow constriction

G01F9/00

Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine

G01F9/001

with electric, electro-mechanic or electronic means G01F9/008 and G01F9/02 take precedence

G01F9/003

by measuring the weight

G01F9/005

by using calibrated reservoirs

G01F9/006

with mechanic means G01F9/008 and G01F9/02 take precedence

G01F9/008

where the other variable is the flight or running time

G01F9/02

wherein the other variable is the speed of a vehicle

G01F9/023

with electric, electro-mechanic or electronic means

G01F9/026

with mechanic means

G01F11/00

Metering by volume

G01F11/00

Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it

G01F11/003

for fluent solid material

G01F11/006

Details or accessories general details G01F15/00

G01F11/02

with measuring chambers which expand or contract during measurement

G01F11/021

of the piston type G01F11/04 takes precedence

G01F11/022

of the gun type and actuated by fluid pressure or by a motor air-operated grease guns F16N5/02; devices to fill holes or cracks B05C17/002

G01F11/023

with provision for varying the stroke of the piston

G01F11/024

the pistons reciprocating in rotatable cylinders dough-dividing machines with division boxes in a revolving body with radially-working pistons A21C5/04

G01F11/025

with manually operated pistons G01F19/005 takes precedence

G01F11/026

of the gun type hand operated grease guns F16N3/12

G01F11/027

of the syringe type

G01F11/028

the dosing device being provided with a dip tube and fitted to a container, e.g. to a bottleneck

G01F11/029

provided with electric controlling means G01F11/022 and G01F11/024 take precedence

G01F11/04

of the free-piston type

G01F11/06

with provision for varying the stroke of the piston

G01F11/08

of the diaphragm or bellows type

G01F11/082

of the squeeze container type using squeeze bottles or the like for soap A47K5/122

G01F11/084

using a bulb to pressurise the fluid to be dispersed

G01F11/086

using an auxiliary pressure to cooperate with the diaphragm or bellows

G01F11/088

using a deformable conduit-like element

G01F11/10

with measuring chambers moved during operation

G01F11/12

of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements involving the tilting or inverting of the supply vessel G01F11/26

G01F11/125

of the peristaltic pump type peristaltic pumps per se

F04B43/12

G01F11/14

wherein the measuring chamber reciprocates

G01F11/16

for liquid or semiliquid

G01F11/18

for fluent solid material

G01F11/20

wherein the measuring chamber rotates or oscillates

G01F11/22

for liquid or semiliquid

G01F11/24

for fluent solid material

G01F11/26

wherein the measuring chamber is filled and emptied by tilting or inverting the supply vessel, e.g. bottle-emptying apparatus

G01F11/261

for fluent solid material

G01F11/262

for liquid or semi-liquid

G01F11/263

with valves

G01F11/265

of the ball type

G01F11/266

using the syphonic effect

G01F11/267

with counters for counting the numbers of measures delivered

G01F11/268

with provision for varying the volume to be delivered

G01F11/28

with stationary measuring chambers having constant volume during measurement

G01F11/282

for fluent solid material not provided for in G01F11/34, G01F11/40, G01F11/46

G01F11/284

combined with electric level detecting means G01F11/282, G01F11/30 - G01F11/46 take precedence

G01F11/286

where filling of the measuring chamber is effected by squeezing a supply container that is in fluid connection with the measuring chamber and excess fluid is sucked back from the measuring chamber during relaxation of the supply container

G01F11/288

squeezing of the supply vessel causing filling of the measuring chamber and backflow from the measuring chamber to the supply vessel being prevented by a check valve G01F11/46 take precedence

G01F11/30

with supply and discharge valves of the lift or plug-lift type

G01F11/32

for liquid or semiliquid

G01F11/34

for fluent solid material

G01F11/36

with supply or discharge valves of the rectilinearly-moved slide type

G01F11/38

for liquid or semiliquid

G01F11/40

for fluent solid material

G01F11/42

with supply or discharge valves of the rotary or oscillatory type

G01F11/44

for liquid or semiliquid

G01F11/46

for fluent solid material

G01F13/00

Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups

G01F13/001

for fluent solid material

G01F13/003

comprising a conveyor belt

G01F13/005

comprising a screw conveyor

G01F13/006

measuring volume in function of time

G01F13/008

taps comprising counting- and recording means counting devices, counting of objects in general G06M

G01F15/00

Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus

G01F15/001

Means for regulating or setting the meter for a predetermined quantity

G01F15/002

for gases

G01F15/003

using electromagnetic, electric or electronic means G01F15/002, G01F15/02 take precedence

G01F15/005

Valves valves in general F16K

G01F15/006

characterised by the use of a particular material, e.g. anti-corrosive material G01F15/14 takes precedence

G01F15/007

comprising means to prevent fraud

G01F15/008

comprising lubricating means

G01F15/02

Compensating or correcting for variations in pressure, density or temperature

G01F15/022

using electrical means

G01F15/024

involving digital counting

G01F15/026

using means to maintain zero differential pressure across the motor G01F1/08 and G01F1/12 take precedence

G01F15/028

for low flow rates

G01F15/04

of gases to be measured

G01F15/043

using electrical means

G01F15/046

involving digital counting

G01F15/06

Indicating or recording devices

G01F15/061

for remote indication

G01F15/063

using electrical means

G01F15/065

with transmission devices, e.g. mechanical

G01F15/066

involving magnetic transmission devices

G01F15/068

with electrical means G01F15/063 takes precedence

G01F15/07

Integration to give total flow, e.g. using mechanically-operated integrating mechanism

G01F15/075

using electrically-operated integrating means

G01F15/0755

involving digital counting

G01F15/08

Air or gas separators in combination with liquid meters

Liquid separators in combination with gas-meters

G01F15/10

Preventing damage by freezing or excess pressure or insufficient pressure

G01F15/105

Preventing damage by hydraulic shocks

G01F15/12

Cleaning arrangements

Filters

G01F15/125

Filters

G01F15/14

Casings, e.g. of special material

G01F15/16

Diaphragms

Bellows

Mountings therefor

G01F15/18

Supports or connecting means for meters

G01F15/185

Connecting means, e.g. bypass conduits

G01F17/00

Measuring volume

G01F17/00

Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies measuring linear dimensions to determine volume G01B

G01F19/00

Calibrated capacity measures for fluids or fluent solid material, e.g. measuring cups

G01F19/002

Measuring spoons or scoops

G01F19/005

for semi-liquid, e.g. fat

G01F19/007

for non fluent solid material, e.g. filamentary

G01F22/00

Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for

G01F22/02

involving measurement of pressure

G01F23/00

Level indicators

G01F23/00

Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm

G01F23/0007

for discrete indicating and measuring G01F23/02 - G01F23/28 take precedence

G01F23/0015

with a whistle or other sonorous signal

G01F23/0023

with a probe suspended by a wire or thread with floats G01F23/40

G01F23/003

with a probe suspended by rotatable arms with floats G01F23/32

G01F23/0038

using buoyant probes with floats G01F23/30 - G01F23/76

G01F23/0046

with a stationary probe, where a liquid specimen is separated from the mean mass and measured by gauge glasses G01F23/02

G01F23/0053

with over-flow pipes

G01F23/02

by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid

G01F23/04

by dip members, e.g. dip-sticks

G01F23/045

cleaning means therefor (e.g. dip-stick wipers)

G01F23/14

by measurement of pressure

G01F23/16

Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid

G01F23/161

for discrete levels G01F23/162 - G01F23/165 take precedence

G01F23/162

by a liquid column

G01F23/164

using a diaphragm, bellow as transmitting element

G01F23/165

of bubbler type

G01F23/167

with mechanic or fluid indicating or recording

G01F23/168

with electric indicating or recording

G01F23/18

Indicating, recording or alarm devices actuated electrically

G01F23/185

for discrete levels

G01F23/20

by measurement of weight, e.g. to determine the level of stored liquefied gas

G01F23/205

for discrete levels

G01F23/22

by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water involving the use of floats G01F23/30

G01F23/223

using a melting or dissolving material as a part of alarm-means

G01F23/226

measuring the braking of a rotatable element

G01F23/24

by measuring variations of resistance of resistors due to contact with conductor fluid

G01F23/241

for discrete levels

G01F23/242

Mounting arrangements for electrodes

G01F23/243

Schematic arrangements of probes combined with measuring circuits

G01F23/244

comprising oscillating circuits

G01F23/245

with a probe moved by an auxiliary power, e.g. meter, to follow automatically the level

G01F23/246

thermal devices

G01F23/247

for discrete levels

G01F23/248

Constructional details; Mounting of probes

G01F23/26

by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields

G01F23/261

for discrete levels

G01F23/263

by measuring variations in capacitance of capacitors

G01F23/265

for discrete levels

G01F23/266

measuring circuits therefor

G01F23/268

mounting arrangements of probes

G01F23/28

by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material

G01F23/282

for discrete levels G01F23/284, G01F23/296 take precedence

G01F23/284

Electromagnetic waves

G01F23/2845

for discrete levels G01F23/288, G01F23/292 take precedence

G01F23/288

X-rays

Gamma rays

or other forms of ionising radiation

G01F23/2885

for discrete levels

G01F23/292

Light

, e.g. infra-red or ultra-violet

G01F23/2921

for discrete levels

G01F23/2922

with light-conducting sensing elements, e.g. prisms

G01F23/2924

for several discrete levels, e.g. with more than one light-conducting sensing element G01F23/2927 takes precedence

G01F23/2925

using electrical detecting means

G01F23/2927

for several discrete levels, e.g. with more than one light-conducting sensing element

G01F23/2928

using light reflected on the material surface

G01F23/296

Acoustic waves

G01F23/2961

for discrete levels G01F23/2962 - G01F23/2968 take precedence

G01F23/2962

Measuring transit time of reflected waves

G01F23/2963

magnetostrictive

G01F23/2965

Measuring attenuation of transmitted waves

G01F23/2966

making use of acoustical resonance or standing waves

G01F23/2967

for discrete levels

G01F23/2968

Transducers specially adapted for acoustic level indicators

G01F23/30

by floats

G01F23/303

characterised by means to prevent fault-level readings due to turbulence of the fluid, e.g. special float housings

G01F23/306

using radioactive radiation

G01F23/32

using rotatable arms or other pivotable transmission elements

G01F23/34

using mechanically actuated indicating means

G01F23/38 takes precedence

G01F23/345

using pneumatically or hydraulically actuated indicating means

G01F23/36

using electrically actuated indicating means

G01F23/38 takes precedence

G01F23/363

using electromechanically actuated indicating means

G01F23/366

using optoelectrically actuated indicating means

G01F23/38

using magnetically actuated indicating means

G01F23/40

using bands or wires as transmission elements

G01F23/42

using mechanically actuated indicating means

G01F23/425

using pneumatically or hydraulically actuated indicating means

G01F23/44

using electrically actuated indicating means

G01F23/443

using electromechanically actuated indicating means

G01F23/446

using opto-electrically actuated indicating means

G01F23/46

using magnetically actuated indicating means

G01F23/48

using twisted spindles as transmission elements

G01F23/50

using mechanically actuated indicating means

G01F23/505

using hydraulically or pneumatically actuated indicating means

G01F23/52

using electrically actuated indicating means

G01F23/523

using electromechanically actuated indicating means

G01F23/526

using opto-electrically actuated indicating means

G01F23/54

using magnetically actuated indicating means

G01F23/543

using magnets only as coupling means in a mechanical transmission path

G01F23/546

using magnets only for directly actuating of switches

G01F23/56

using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements

G01F23/58

using mechanically actuated indicating means

G01F23/585

using pneumatically or hydraulically actuated indicating means

G01F23/60

using electrically actuated indicating means

G01F23/603

using electromechanically actuated indicating means

G01F23/606

using opto-electrically actuated indicating means

G01F23/62

using magnetically actuated indicating means

G01F23/64

of the free float type

without mechanical transmission elements

G01F23/66

using mechanically actuated indicating means

G01F23/665

using pneumatically or hydraulically actuated indicating means

G01F23/68

using electrically actuated indicating means

G01F23/683

using electromechanically actuated indicating means

G01F23/686

using opto-electrically actuated indicating means

G01F23/70

for sensing changes in level only at discrete points

G01F23/703

using electromechanically actuated indicating means

G01F23/706

using opto-electrically actuated indicating means

G01F23/72

using magnetically actuated indicating means

G01F23/74

for sensing changes in level only at discrete points

G01F23/76

characterised by the construction of the float

G01F23/80

Arrangements for signal processing

G01F23/802

Particular electronic circuits for digital processing equipment

G01F23/804

containing circuits handling parameters other than liquid level

G01F23/806

Particular electronic circuits for handling non-digital processing equipment

G01F23/808

containing circuits handling parameters other than liquid level

G01F25/00

Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume

G01F25/0084

for measuring volume

G01F25/0092

for metering by volume

G01F25/10

of flowmeters

G01F25/11

using a seal ball or piston in a test loop

G01F25/12

using tracer

G01F25/13

using a reference counter

G01F25/14

using a weighing apparatus

G01F25/15

specially adapted for gas meters G01F25/11 - G01F25/14, G01F25/17 take precedence

G01F25/17

using calibrated reservoirs

G01F25/20

of apparatus for measuring liquid level

G01F25/22

Checking proper indicating of discrete level by floats

G01F25/24

Testing proper functioning of electronic circuits