|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G01 |
MEASURING (counting Fulltext... Hierarchy... Expanded...G06M); TESTING

|  | G01F |
MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME

|  | G01F |
Note(s) Attention is drawn to the notes immediately following the class title (Fulltext... Hierarchy... Expanded...G01).

|  | G01F 1/00 - G01F 9/00 |
Measuring volume flow

|  | G01F 1/00 |
Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow (measuring a proportion of the volume flow Fulltext... Hierarchy... Expanded...G01F 5/00; measuring speed of flow Fulltext... Hierarchy... Expanded...G01P 5/00; indicating presence or absence of flow Fulltext... Hierarchy... Expanded...G01P 13/00; regulating quantity or ratio Fulltext... Hierarchy... Expanded...G05D) [2]

|  | G01F 1/00 |
Note(s) Groups Fulltext... Hierarchy... Expanded...G01F 1/72, Fulltext... Hierarchy... Expanded...G01F 1/74, Fulltext... Hierarchy... Expanded...G01F 1/76 take precedence over groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...G01F 1/05-G01F 1/68. [2]

|  | G01F 1/02 - G01F 1/04 |
( transferred to Fulltext... Hierarchy... Expanded...G01F 15/07 )

|  | G01F 1/05 |
· | by using mechanical effects [2]

|  | G01F 1/06 |
· · | using rotating vanes with tangential admission [2]

|  | G01F 1/07 |
· · · | with mechanical coupling to the indicating device [2]

|  | G01F 1/075 |
· · · | with magnetic or electromagnetic coupling to the indicating device [2]

|  | G01F 1/08 |
· · · | Adjusting, correcting, or compensating means therefor [2]

|  | G01F 1/10 |
· · | using rotating vanes with axial admission [2]

|  | G01F 1/11 |
· · · | with mechanical coupling to the indicating device [2]

|  | G01F 1/115 |
· · · | with magnetic or electromagnetic coupling to the indicating device [2]

|  | G01F 1/12 |
· · · | Adjusting, correcting, or compensating means therefor

|  | G01F 1/20 |
· · | by detection of dynamic effects of the fluid flow [2]

|  | G01F 1/22 |
· · · | by variable-area meters, e.g. rotameters [2]

|  | G01F 1/24 |
· · · · | with magnetic or electric coupling to the indicating device [2]

|  | G01F 1/26 |
· · · · | of the valve type [2]

|  | G01F 1/28 |
· · · | by drag-force, e.g. vane type or impact flowmeter [2]

|  | G01F 1/30 |
· · · · | for fluent solid material [2]

|  | G01F 1/32 |
· · · | by swirl flowmeter, e.g. using Karmann vortices [2]

|  | G01F 1/34 |
· · | by measuring pressure or differential pressure [2]

|  | G01F 1/36 |
· · · | the pressure or differential pressure being created by the use of flow constriction [2]

|  | G01F 1/37 |
· · · · | the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels, e.g. by U-tubes [2]

|  | G01F 1/38 |
· · · · | the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule [2]

|  | G01F 1/40 |
· · · · | Details of construction of the flow constriction devices [2]

|  | G01F 1/42 |
· · · · · | Orifices or nozzles [2]

|  | G01F 1/44 |
· · · · · | Venturi tubes [2]

|  | G01F 1/46 |
· · · · · | Pitot tubes [2]

|  | G01F 1/48 |
· · · | the pressure or differential pressure being created by a capillary element [2]

|  | G01F 1/50 |
· · · | Correcting or compensating means [2]

|  | G01F 1/52 |
· · | by measuring the height of the fluid level due to the lifting power of the fluid flow [2]

|  | G01F 1/54 |
· · | by means of chains, flexible bands, or wires introduced into, and moved by, the flow [2]

|  | G01F 1/56 |
· | by using electric or magnetic effects (Fulltext... Hierarchy... Expanded...G01F 1/66 takes precedence) [2]

|  | G01F 1/58 |
· · | by electromagnetic flowmeters [2]

|  | G01F 1/60 |
· · · | Circuits therefor [2]

|  | G01F 1/62 |
· · | by electron paramagnetic resonance (EPR) or nuclear magnetic resonance (NMR) flowmeters [2]

|  | G01F 1/64 |
· · | by measuring electrical currents passing through the fluid flow; by measuring electrical potential generated by the fluid flow, e.g. by electrochemical, contact, or friction effects (Fulltext... Hierarchy... Expanded...G01F 1/58 takes precedence) [2]

|  | G01F 1/66 |
· | by measuring frequency, phase shift, or propagation time of electromagnetic or other waves, e.g. ultrasonic flowmeters [2]

|  | G01F 1/68 |
· | by using thermal effects [2]

|  | G01F 1/70 |
· | by tracer flowmeters, e.g. using radioactive tracers [2]

|  | G01F 1/72 |
· | Devices for measuring pulsing fluid flows [2]

|  | G01F 1/74 |
· | Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid [2]

|  | G01F 1/76 |
· | Devices for measuring mass flow of a fluid or a fluent solid material (weighing a continuous stream of material during flow Fulltext... Hierarchy... Expanded...G01G 11/00) [2]

|  | G01F 1/78 |
· · | Direct mass flowmeters [2]

|  | G01F 1/80 |
· · · | operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted [2]

|  | G01F 1/82 |
· · · · | 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 [2]

|  | G01F 1/84 |
· · · · | Gyroscopic mass flowmeters [2]

|  | G01F 1/86 |
· · | Indirect mass flowmeters, e.g. measuring volume flow and density, temperature, or pressure [2]

|  | G01F 1/88 |
· · · | with differential-pressure measurement to determine the volume flow [2]

|  | G01F 1/90 |
· · · | with positive-displacement meter or turbine meter to determine the volume flow [2]

|  | G01F 3/00 |
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 Fulltext... Hierarchy... Expanded...G01F 5/00)

|  | G01F 3/02 |
· | with measuring chambers which expand or contract during measurement

|  | G01F 3/04 |
· · | having rigid movable walls

|  | G01F 3/06 |
· · · | comprising members rotating in a fluid-tight or substantially fluid-tight manner in a housing

|  | G01F 3/08 |
· · · · | Rotary-piston or ring-piston meters

|  | G01F 3/10 |
· · · · | Geared or lobed impeller meters

|  | G01F 3/12 |
· · · · | Meters with nutating members, e.g. discs

|  | G01F 3/14 |
· · · | comprising reciprocating pistons, e.g. reciprocating in a rotating body

|  | G01F 3/16 |
· · · · | in stationary cylinders

|  | G01F 3/18 |
· · · · · | involving two or more cylinders

|  | G01F 3/20 |
· · | having flexible movable walls, e.g. diaphragms, bellows (diaphragms and bellows therefor Fulltext... Hierarchy... Expanded...G01F 15/16)

|  | G01F 3/22 |
· · · | for gases

|  | G01F 3/24 |
· | with measuring chambers moved during operation (wet gas-meters Fulltext... Hierarchy... Expanded...G01F 3/30)

|  | G01F 3/26 |
· · | Tilting-trap meters

|  | G01F 3/28 |
· · | on carriers rotated by the weight of the liquid in the measuring chambers

|  | G01F 3/30 |
· | Wet gas-meters

|  | G01F 3/32 |
· · | comprising partitioned drums rotating or nutating in a liquid

|  | G01F 3/34 |
· · | comprising bells reciprocating in a liquid

|  | G01F 3/36 |
· | with stationary measuring chambers having constant volume during measurement (with measuring chambers which expand or contract during measurement Fulltext... Hierarchy... Expanded...G01F 3/02)

|  | G01F 3/38 |
· · | having only one measuring chamber

|  | G01F 5/00 |
Measuring a proportion of the volume flow

|  | G01F 7/00 |
Volume-flow measuring devices with two or more measuring ranges; Compound meters

|  | G01F 9/00 |
Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine

|  | G01F 9/02 |
· | wherein the other variable is the speed of a vehicle

|  | G01F 11/00 - G01F 13/00 |
Metering by volume

|  | G01F 11/00 |
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

|  | G01F 11/02 |
· | with measuring chambers which expand or contract during measurement

|  | G01F 11/04 |
· · | of the free-piston type

|  | G01F 11/06 |
· · · | with provision for varying the stroke of the piston

|  | G01F 11/08 |
· · | of the diaphragm or bellows type (diaphragms or bellows therefor Fulltext... Hierarchy... Expanded...G01F 15/16)

|  | G01F 11/10 |
· | with measuring chambers moved during operation

|  | G01F 11/12 |
· · | 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 Fulltext... Hierarchy... Expanded...G01F 11/26)

|  | G01F 11/14 |
· · · | wherein the measuring chamber reciprocates

|  | G01F 11/16 |
· · · · | for liquid or semiliquid

|  | G01F 11/18 |
· · · · | for fluent solid material

|  | G01F 11/20 |
· · · | wherein the measuring chamber rotates or oscillates

|  | G01F 11/22 |
· · · · | for liquid or semiliquid

|  | G01F 11/24 |
· · · · | for fluent solid material

|  | G01F 11/26 |
· · | wherein the measuring chamber is filled and emptied by tilting or inverting the supply vessel, e.g. bottle-emptying apparatus

|  | G01F 11/28 |
· | with stationary measuring chambers having constant volume during measurement (with measuring chambers which expand or contract during measurement Fulltext... Hierarchy... Expanded...G01F 11/02)

|  | G01F 11/30 |
· · | with supply and discharge valves of the lift or plug-lift type

|  | G01F 11/32 |
· · · | for liquid or semiliquid

|  | G01F 11/34 |
· · · | for fluent solid material

|  | G01F 11/36 |
· · | with supply and discharge valves of the rectilinearly-moved slide type

|  | G01F 11/38 |
· · · | for liquid or semiliquid

|  | G01F 11/40 |
· · · | for fluent or solid material

|  | G01F 11/42 |
· · | with supply and discharge valves of the rotary or oscillatory type

|  | G01F 11/44 |
· · · | for liquid or semiliquid

|  | G01F 11/46 |
· · · | for fluent solid material

|  | G01F 13/00 |
Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups

|  | G01F 15/00 |
Details of, or accessories for, apparatus of the preceding groups insofar as such details or appliances are not adapted to particular types of such apparatus

|  | G01F 15/02 |
· | Compensating or correcting for variations in pressure, density, or temperature

|  | G01F 15/04 |
· · | of gases to be measured

|  | G01F 15/06 |
· | Indicating or recording devices, e.g. for remote indication (indicating or recording in general Fulltext... Hierarchy... Expanded...G01D)

|  | G01F 15/07 |
· | Integration to give total flow, e.g. using mechanically-operated integrating mechanism [2]

|  | G01F 15/075 |
· · | using electrically-operated integrating means [2]

|  | G01F 15/08 |
· | Air or gas separators in combination with liquid meters; Liquid separators in combination with gas-meters

|  | G01F 15/10 |
· | Preventing damage by freezing or excess pressure or insufficient pressure

|  | G01F 15/12 |
· | Cleaning arrangements; Filters (filters in general Fulltext... Hierarchy... Expanded...B01D)

|  | G01F 15/14 |
· | Casings, e.g. of special material

|  | G01F 15/16 |
· | Diaphragms; Bellows; Mountings therefor

|  | G01F 15/18 |
· | Supports or connecting means for meters

|  | G01F 17/00 - G01F 19/00 |
Measuring volume

|  | G01F 17/00 |
Determining the capacity of containers or cavities; Determining the volume of solid bodies (measuring linear dimensions to determine volume Fulltext... Hierarchy... Expanded...G01B)

|  | G01F 19/00 |
Measures of capacity, e.g. measuring-cups (in German "Messbecher")

|  | G01F 23/00 |
Level indicators

|  | G01F 23/00 |
Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm (in wells Fulltext... Hierarchy... Expanded...E21B 47/04; adaptation to, or mounting on, steam boilers Fulltext... Hierarchy... Expanded...F22B 37/78; indicating and recording in general Fulltext... Hierarchy... Expanded...G01D; level regulation Fulltext... Hierarchy... Expanded...G05D; alarm devices Fulltext... Hierarchy... Expanded...G08B)

|  | G01F 23/02 |
· | 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

|  | G01F 23/04 |
· | by dip members, e.g. dip-sticks

|  | G01F 23/06 |
· | by floats

|  | G01F 23/08 |
· · | actuating indicating, recording, or alarm devices by mechanical means

|  | G01F 23/10 |
· · | actuating indicating, recording, or alarm devices electrically

|  | G01F 23/12 |
· · | actuating indicating, recording, or alarm devices by magnetic means

|  | G01F 23/14 |
· | by measurement of pressure (measuring pressure in general Fulltext... Hierarchy... Expanded...G01L)

|  | G01F 23/16 |
· · | 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 [2]

|  | G01F 23/18 |
· · | Indicating, recording, or alarm devices actuated electrically

|  | G01F 23/20 |
· | by measurement of weight, e.g. to determine the level of stored liquefied gas (weighing in general Fulltext... Hierarchy... Expanded...G01G)

|  | G01F 23/22 |
· | by measurement of 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 Fulltext... Hierarchy... Expanded...G01F 23/06)

|  | G01F 23/24 |
· · | by measuring variations of resistance of resistors due to contact with conductor fluid

|  | G01F 23/26 |
· · | 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

|  | G01F 23/28 |
· · | by measuring the variations of parameters of electromagnetic, sonic, or ultrasonic waves applied directly to the liquid or fluent solid material

|  | G01F 25/00 |
Testing or calibrating apparatus for measuring volume, volume flow, or liquid level, or for metering by volume