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    BASIC DEFINITIONS ON INSTRUMENTATION

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    Talib Al_Munawri
    Director-General
    Director-General

    Posts : 337
    Join date : 2009-07-03
    Age : 30
    Location : Sultanate of Oman

    BASIC DEFINITIONS ON INSTRUMENTATION

    Post by Talib Al_Munawri on Thu Aug 12, 2010 9:32 pm


    BASIC DEFINITIONS ON INSTRUMENTATION




    Instrumentation uses a lot of words which need to be explained.
    Before we can talk about instrumentation and process control you
    need to understand the following words
    .



    • Instrument -

    Any device for measuring, indicating, controlling, recording and
    adjusting a physical or chemical property e.g. flow, pressure,
    acidity, weight, gas concentration, etc.


    • Instrumentation -

    A complete set of instruments used to control a process,
    e.g. refining, oil/gas production, LNG, LPG, etc.


    • Indicator -

    A device which shows a measured value to the operator.


    • Recorder -

    A device which continuously records measurements, either
    electronically or on an ink chart. It is used to show production
    figures, etc.


    • Process Loop -

    A group of instruments used to control a single process variable
    e.g. pressure, flow, level, etc.


    • Process -

    The operator's word for a manufacturing unit e.g., refining, liquefying gas, etc.


    • Measured Variable or Process Variable

    (MV) The value of the property being controlled by a single
    process loop e.g. pressure, flow, level, etc.


    • Desired Value or Set Point (SP)

    The value required by the operator.


    • Error Signal (ES)

    The difference between the measured variable and the set point
    should be zero for good control.


    • Controller -

    A device, either pneumatic or electrical / electronic, which adjusts the error signal to zero.


    • Correcting Unit -

    (Final Control Element) A device which works on the command of
    the controller. It is used to adjust the measured value to obtain
    a zero error signal, e.g. control valve, etc.


    • Transmission -

    A method of standardising signals sent from various parts of the plant.


    • Transmitter -

    A device which takes a measurement and changes it into a standard signal.


    • Transducer -

    A device which changes one form of energy to
    another; particularly from electrical to pneumatic.



    giri
    Member
    Member

    Posts : 1
    Join date : 2013-04-26
    Age : 35

    Re: BASIC DEFINITIONS ON INSTRUMENTATION

    Post by giri on Fri Apr 26, 2013 10:50 am

    dead band

      Current date/time is Mon Jul 24, 2017 3:33 am