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  2. Sight glass - Wikipedia

    en.wikipedia.org/wiki/Sight_glass

    Water gauge on a steam locomotive. Here the water is at the “top nut”, the maximum working level. Note the patterned backplate to help reading and toughened glass shroud. A sight glass or water gauge is a type of level sensor, a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within.

  3. Float switch - Wikipedia

    en.wikipedia.org/wiki/Float_switch

    A float switch is a type of level sensor, a device used to detect the level of liquid within a tank. The switch may be used to control a pump, as an indicator, an alarm, or to control other devices. One type of float switch uses a mercury switch inside a hinged float. Another common type is a float that raises a rod to actuate a microswitch.

  4. Magnetic level gauge - Wikipedia

    en.wikipedia.org/wiki/Magnetic_level_gauge

    A magnetic level gauge pulled out from inside the valve housing on top of a railway tank car in the United States [1]. A magnetic level gauge is a level gauge based on a float device that can experience floatation in both high and low density fluids.

  5. Fuel gauge - Wikipedia

    en.wikipedia.org/wiki/Fuel_gauge

    When the tank level is high and maximum current is flowing, the needle points to "F" indicating a full tank. When the tank is empty and the least current is flowing, the needle points to "E" indicating an empty tank; some vehicles use the indicators "1" (for full) and "0" (for empty) or "R" (for reserve) instead. [4]

  6. List of sensors - Wikipedia

    en.wikipedia.org/wiki/List_of_sensors

    Oil level sensor; Oil pressure sensor; Omniview technology; Oxygen sensor (O 2) ... Magnetic level gauge; Nuclear density gauge; Piezocapacitive pressure sensor;

  7. A cautionary tale: Oil delivery to Hackensack home without a ...

    www.aol.com/cautionary-tale-oil-delivery...

    An old oil tank had been removed from the home on Maple Hill Drive and the pipes were cut, but the fill port that had led to the tank had been left intact, and an automatic delivery service had ...

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