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  2. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    The current depends on the number of ions, which depends on the pressure in the gauge. Hot cathode gauges are accurate from 10 −3 Torr to 10 −10 Torr. The principle behind cold cathode version is the same, except that electrons are produced in the discharge of a high voltage. Cold cathode gauges are accurate from 10 −2 Torr to 10 −9 ...

  3. Talk:Propane/Archive 1 - Wikipedia

    en.wikipedia.org/wiki/Talk:Propane/Archive_1

    Perhaps we need an explanation of why weighing the tank is much more accurate than a pressure gauge instead of a detailed "how-to". A pressure gauge does more to measure the temperature (and therefore vapor pressure) of the propane in the tank. At a constant temperature it won't change until the liquid is gone.

  4. Pressure regulator - Wikipedia

    en.wikipedia.org/wiki/Pressure_regulator

    Two-gauge pressure regulator connected to gas cylinder used for breathing gas supply. Pressure regulators are used with diving cylinders for Scuba diving. The tank may contain pressures in excess of 3,000 pounds per square inch (210 bar), which could cause a fatal barotrauma injury to a person breathing it directly. A demand controlled ...

  5. Permanent downhole gauge - Wikipedia

    en.wikipedia.org/wiki/Permanent_Downhole_Gauge

    A permanent downhole gauge (PDG) is a pressure and/or temperature gauge permanently installed in an oil or gas well. [1] These gauges are typically installed in the tubing in the well and can measure the tubing pressure, annulus pressure, or both.

  6. Autogas - Wikipedia

    en.wikipedia.org/wiki/Autogas

    In others, an additional gauge is added to display the level of fuel in the autogas tank separately from the existing petrol gauge. In most modern installations, an electronic device called a tachometric relay or safety switch is used to operate electrical shut-off solenoids. These work by sensing that the engine is running by detecting ...

  7. Level sensor - Wikipedia

    en.wikipedia.org/wiki/Level_sensor

    A variation of magnetic sensing is the "Hall effect" sensor which utilizes the magnetic sensing of a mechanical gauge's indications. In a typical application, a magnetism-sensitive "Hall effect sensor" is affixed to a mechanical tank gauge that has a magnetized indicator needle, so as to detect the indicating position of the gauge's needle.

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