Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid

Introduced: September 1968

IPC and CPC are identically structured here. All 8 subcodes exist in both systems.

Child Classifications

Navigate with arrow keys, Enter to open

G01L 23/02 mechanically indicating or recording and involving loaded or return springs IPC+CPC Available in IPC and CPC
G01L 23/04 involving means subjected to known counteracting pressure IPC+CPC Available in IPC and CPC
G01L 23/06 Indicating or recording by optical means IPC+CPC Available in IPC and CPC
G01L 23/08 operated electrically +1 CPC IPC+CPC Available in IPC and CPC
G01L 23/20 combined with planimeters or integrators IPC+CPC Available in IPC and CPC
G01L 23/22 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines +2 CPC IPC+CPC Available in IPC and CPC
G01L 23/24 for measuring pressure in inlet or exhaust ducts of internal-combustion engines IPC+CPC Available in IPC and CPC
G01L 23/26 Details or accessories IPC+CPC Available in IPC and CPC