Determine the manipulated variable, controlled variable,
and the measured variable given a description of various
typical industrial processes.
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PROCESS VARIABLE - Sensor O/P value in the form of 4-20ma
corresponds to Actual value after conditioning.(say level)
Example: Radar Lvl TX
SET VALUE - Required Process value to make the system
stable.
Example: Actual Tank lvl 100%
Required Lvl (to be maintain) 70%
MANIPULATED VARIABLE - Output Signal(4-20ma) required to
maintain the process variable near to setpoint.
Example: Control valve action to fill the tank.
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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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