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

Introduced: July 1974

Full Title

Full titles differ between systems:

IPC:

Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow > by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters

CPC:

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

Of 6 combined children, 3 exist in both systems.

3 codes are CPC-only extensions.

IPC defines codes here since 2022.

Child Classifications

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G01F 1/661 using light since 2022 IPC+CPC Available in IPC and CPC
G01F 1/662 CPC only CPC only
G01F 1/663 by measuring Doppler frequency shift since 2022 IPC+CPC Available in IPC and CPC
G01F 1/665 CPC only CPC only
G01F 1/666 CPC only CPC only
G01F 1/667 Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters since 2022 +1 CPC IPC+CPC Available in IPC and CPC