the basic of a DP flow transmitter are the following
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Answer Posted / bunny
DP stands for differential pressure.i.e,we will have a high
pressure and a low pressure.DP=HP-LP.The idea is we will
create a differential pressure in the flow line(by using a
orifice plate,for example) were which the flow has to be
measured and will measure this DP which is proportional to
flow.For that,2 pressure taping will be taken(for HP &
LP)and it is connected to the the HP & LP connection slot of
the DP transmitter through a manifold valve.The DP
transmitter will convert these DP signal to (4-20)mA range
and send to the controller.
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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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