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i want to Measure the Difference pressure of Packed distillation Column of height 3 mtr. h.p. side connected to
bottom & L.P. side connected to the top , so tell me what
will be THE URV & LRV of that D.P. transmitter?
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Answer Posted / sateesh kumar singh
If you want to mesure a differential pressure of Packed
distillation Column and currect out put signal then
instrument mesuring rang should be higher than required
measuring renge.
URV >3000 mmm WC ( Say 4000 mm WC)
LRV= 0 mm WC
calibrate it 0 mm WC to 4000 mm WC .
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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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