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Determine the manipulated variable, controlled variable,
and the measured variable given a description of various
typical industrial processes.
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Answer Posted / ecxlsync
* Manipulated variable is the one being manipulated by the
final element(usually control valve) to correct the error.
* Controlled variable is the one being controlled or the
desired process value according to the SP.
* Measured Variable is the output of the measuring device.
example water temperature control:
there is a heat exchanger. the are 2 inlets of this exchanger
which is hot and cold water. the hot water must be cool down
when it leaves the exchanger at a certain temperature being
defined by the SP. a control valve installed at the cold
water inlet line to control the flow of cold water. the cold water flow at the control valve downstream is the MANIPULATED VARIABLE. the temp of hot water discharge from exchanger which has attained the setpoint value is the CONTROLLED VARIABLE.
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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