Question: The liquid level control system, where the liquid level is measured and the level transmitter output is sent to a feedback controller (LC) (level controller),

The liquid level control system, where the liquid level is measured and the level transmitter

output is sent to a feedback controller (LC) (level controller), is shown below. In the steady

state, = 2 m, = 1000 L and 1 = 50 L/min, as well as Gv = 1 and Gm = 1.

a) Draw the flow diagram of the system (process + control).

In case the reference value is increased to 2.5 m;

b) Find the offset for P control with Kc value of 2.

c) Find the offset for PI control with Kc value of 2 and I value of 1.

d) Due to the malfunction in the controller, the P function does not work and therefore the

controller only works as I. In this case, find the offset.

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