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why we used for range in pnumatic 3-15 psi and current 4-20
ma?
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Answer Posted / pankaj kumar
because in b/n 3 to 15 psi the responce of actuator & control
valve is linear.before this hunting problem occurs.
we use 4 to 20 ma signal as standard signal because during
confurigation of hart 250ohm resistance or connected that is
easly converted in to voltage signal.(1v to 5v )......
instead of voltage signal current signal use because voltage
is pickup noise more as compare to current.
and in case of voltage signal chance of voltage
droff...............
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What is rang ability?
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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