IPC Main Group
G05D 21/00 Control of chemical or physico-chemical variables, e.g. pH-value
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- CONTROLLING; REGULATING
- Subclass:
- SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
Scope Notes
Application references: Controlling density in sedimentation arrangements Controlling separation of gases or vapours by gas-analysis apparatus Control of fluid composition, e.g. gradient, of fluid carrier in chemical analysis
1 direct subcode
Child Classifications
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- G05D 21/02 characterised by the use of electric means