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Oil, gas and petrochemical process industries


    Instrumentation in general

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    Talib Al_Munawri
    Director-General
    Director-General

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

    Instrumentation in general

    Post by Talib Al_Munawri on Fri Aug 21, 2009 2:58 am



    Instrumentation in general



    Instrumentation is a device or group of related devices used to:

    measure

    monitor

    control a process

    The purpose of process control instrumentation is
    to measure, monitor, and control a process.




    Process instruments fall into five different groups

    primary elements and sensors

    transmitters

    controllers

    transducers

    final control elements


    Transducers


    is a device, usually electrical, electronic,
    or electro-mechanical, that converts one type
    of energy to another for various purposes including
    measurement or information transfer
    Sensors are electrical or electronic,
    although other types exist. There are

    Temperature sensors
    thermometers, thermocouple

    heat sensors
    calorimeter is a device used to measure the heat of
    chemical reactions or physical changes

    Transmitter
    is any device which converts measurements from
    a sensor into a signal to be received, usually
    sent via wires, by some display or control device
    located a distance away.

    Example
    A pressure transmitter might use 4 ma as
    a representation for 50 psig of pressure
    and 20 ma as 1000 psig of pressure and any
    value in between proportionately ranged between 50 and 1000 psig.
    Technology transmitters used pneumatic pressure
    typically ranged between 3 to 15 psig (20 to 100 kPa)
    to represent a process variable


    Process Controllers

    Control and monitor a temperature, pressure,
    level or flow process variable in batch and continuous processes




      Current date/time is Mon Aug 21, 2017 4:06 am