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Answer Posted / sahnis
First step is to isolate the trasmitter chamber from tank.
Close HP first and then LP. After that drain the Chamber by
opening drain valve on the bottom of the chamber. Then
connect a trasparent hose and keep it parallel to the
chamber to know the level inside the Transmitter chamber.
Then start filling the Fluid untill the low level. When the
low level reached, the zero adjustment( 4mA output from tx)
can be done by turning the zero adjustment screw. Then fill
the fluid upto highest level and turn the span to get 20mA.
Calibration is done and the instrument is now ready to be on
loop.
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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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