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PCE
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DIFF Subgroup
G01L 21/30

by making use of ionisation effects

Introduced: September 1968

Full Title

Vacuum gauges > by making use of ionisation effects

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

Child Classifications

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  • G01L 21/32 using electric discharge tubes with thermionic cathodes IPC+CPC Available in IPC and CPC
  • G01L 21/34 using electric discharge tubes with cold cathodes IPC+CPC Available in IPC and CPC
  • G01L 21/36 using radioactive substances IPC+CPC Available in IPC and CPC