TREA

Vacuum gauges

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Industry

  • CPC
  • G01L21/00
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Parent Industries

GPHYSICS G01Measuring instruments G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE

Current Industry

G01L21/00Vacuum gauges

Sub Industries

G01L21/02having a compression chamber in which gas, whose pressure is to be measured, is compressed G01L21/04wherein the chamber is closed by liquid vacuum gauges of the McLeod type G01L21/06actuated by rotating or inverting the measuring device G01L21/08by measuring variations in the transmission of acoustic waves through the medium, the pressure of which is to be measured G01L21/10by measuring variations in the heat conductivity of the medium, the pressure of which is to be measured G01L21/12measuring changes in electric resistance of measuring members G01L21/14using thermo-couples G01L21/16by measuring variation of frictional resistance of gases G01L21/18using a pendulum G01L21/20using members oscillating about a vertical axis G01L21/22using resonance effects of a vibrating body Vacuum gauges of the Klumb type G01L21/24using rotating members Vacuum gauges of the Langmuir type G01L21/26by making use of radiometer action G01L21/28using torsional rotary measuring members G01L21/30by making use of ionisation effects G01L21/32using electric discharge tubes with thermionic cathodes G01L21/34using electric discharge tubes with cold cathodes G01L21/36using radioactive substances
Industries