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

Introduced: September 1968

Of 13 combined children, 7 exist in both systems.

6 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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G01F 23/0007 +1 CPC CPC only CPC only
G01F 23/0023 CPC only CPC only
G01F 23/003 CPC only CPC only
G01F 23/0038 CPC only CPC only
G01F 23/0046 CPC only CPC only
G01F 23/0053 CPC only CPC only
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 IPC+CPC Available in IPC and CPC
G01F 23/04 by dip members, e.g. dip-sticks +1 CPC IPC+CPC Available in IPC and CPC
G01F 23/14 by measurement of pressure IPC+CPC Available in IPC and CPC
G01F 23/20 by measurement of weight, e.g. to determine the level of stored liquefied gas +1 CPC IPC+CPC Available in IPC and CPC
G01F 23/22 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) +2 CPC IPC+CPC Available in IPC and CPC
G01F 23/30 by floats since 1985 +2 CPC IPC+CPC Available in IPC and CPC
G01F 23/80 Arrangements for signal processing since 2022 +2 CPC IPC+CPC Available in IPC and CPC