TREA

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

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Industry

  • CPC
  • G01L23/00
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Parent Industries

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

Current Industry

G01L23/00Devices 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

Sub Industries

G01L23/02mechanically indicating or recording and involving loaded or return springs G01L23/04involving means subjected to known counter-acting pressure G01L23/06Indicating or recording by optical means G01L23/08operated electrically G01L23/085by measuring fluctuations of starter motor current or of battery voltage G01L23/10by pressure-sensitive members of the piezo-electric type G01L23/12by changing capacitance or inductance G01L23/125by changing capacitance G01L23/14by electromagnetic elements G01L23/145by magnetostrictive elements G01L23/16by photoelectric means G01L23/18by resistance strain gauges G01L23/20combined with planimeters or integrators G01L23/22for detecting or indicating knocks in internal-combustion engines Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines G01L23/221for detecting or indicating knocks in internal combustion engines G01L23/222using piezoelectric devices G01L23/223using magnetic or magnetostrictive means G01L23/225circuit arrangements therefor G01L23/226using specific filtering G01L23/227using numerical analyses G01L23/24specially adapted for measuring pressure in inlet or exhaust ducts of internal-combustion engines G01L23/26Details or accessories G01L23/28Cooling means G01L23/30Means for indicating consecutively positions of pistons or cranks of internal-combustion engines in combination with pressure indicators G01L23/32Apparatus specially adapted for recording pressure changes measured by indicators
Industries