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(a) With the aid of a sketch explain how proportional action is produced in a pneumatic...

(a) With the aid of a sketch explain how proportional action is produced in a pneumatic controller whose output is 0.2 to 1.0 bar. Assume that the controller is direct acting.

(b) Show, mathematically, that the output is dependent on the difference between the measured and desired values.

(c) With the aid of a well annotated sketch describe the construction and operation of a P + I + D controller having a pneumatic output.

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