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If the temperature of the fluid in Problem 1.1 is to be regulated together with its level, modify the analog control system to achieve the additional control. (Hint: An additional actuator and sensor are needed.) Obtain a block diagram for the two-input-two-output control system with digital control.
Problem 1.1
A fluid level control system includes a tank, a level sensor, a fluid source, and an actuator to control fluid inflow. Consult any classical control text1 to obtain a block diagram of an analog fluid control system. Modify the block diagram to show how the fluid level could be digitally controlled.
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