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  2. Thermocouple - Wikipedia

    en.wikipedia.org/wiki/Thermocouple

    A thermocouple can be used as a vacuum gauge over the range of approximately 0.001 to 1 torr absolute pressure. In this pressure range, the mean free path of the gas is comparable to the dimensions of the vacuum chamber , and the flow regime is neither purely viscous nor purely molecular . [ 35 ]

  3. Pirani gauge - Wikipedia

    en.wikipedia.org/wiki/Pirani_gauge

    An alternative to the Pirani gauge is the thermocouple gauge, which works on the same principle of detecting thermal conductivity of the gas by a change in temperature. In the thermocouple gauge, the temperature is sensed by a thermocouple rather than by the change in resistance of the heated wire.

  4. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. A pressure sensor usually acts as a transducer; it generates a signal as a function of the pressure imposed. Pressure sensors can vary drastically in technology, design, performance, application suitability and ...

  5. Piston-cylinder apparatus - Wikipedia

    en.wikipedia.org/wiki/Piston-cylinder_apparatus

    The accuracy of the temperature is influenced by both random and systematic errors, and is smaller at higher temperature and pressure conditions. Such errors can arise from temperature gradients, differential pressures in the assembly, contamination during the experiment and the effect of pressure on thermocouple electromotive force. These ...

  6. Timeline of temperature and pressure measurement technology

    en.wikipedia.org/wiki/Timeline_of_temperature...

    1738 — Daniel Bernoulli asserted in Hydrodynamica the principle that as the speed of a moving fluid increases, the pressure within the fluid decreases. ( Kinetic theory ) 1742 — Anders Celsius proposed a temperature scale in which 100 represented the temperature of melting ice and 0 represented the boiling point of water at 25 inches and 3 ...

  7. Thermowell - Wikipedia

    en.wikipedia.org/wiki/Thermowell

    A temperature sensor, such as a thermometer, thermocouple, or resistance temperature detector, is inserted in the open end of the tube, which is usually in the open air outside the piping or vessel and any thermal insulation. Thermodynamically, the process fluid transfers heat to the thermowell wall, which in turn transfers heat to the sensor ...

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