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Thread: manometer with photocell

  1. #1

    manometer with photocell

    Dear all,
    i have some question regarding control system.
    I'm working in a gas plant, and in this plant there is a u-manometer with 2 kind of photocell,
    the first one is photocell for safety level, and the second is photocell for reaction control.
    I'm sorry i can not share the P&ID because i do not have it.
    But could anyone tell me how this configuration work?
    Here i attach the simple P&ID (it's all i have)

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  3. Re: manometer with photocell

    Pressure measuring devices using liquid columns in vertical or inclined tubes are called manometers. One of the most common is the water filled u-tube manometer used to measure pressure difference in pitot or orifices located in the airflow in air handling or ventilation system.

    Vertical U-Tube Manometer
    The pressure difference in a vertical U-Tube manometer can be expressed as

    pd = γ h

    = ρ g h (1)


    pd = pressure

    γ = specific weight of the fluid in the tube (kN/m3, lb/ft3 )

    ρ = density (kg/m3, lb/ft3)

    g = acceleration of gravity (9.81 m/s2, 32.174 ft/s2)

    h = liquid height (m, ft)

    The specific weight of water, which is the most commonly used fluid in u-tube manometers, is 9.81 kN/m3 or 62.4 lb/ft3

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    1. Article: manometer with photocell
      By leon_aurel in forum Home Articles
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      Last Post: 02-19-2012, 10:43 PM

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