For the control loop shown, make a drawing similar to Figure $2\mathrm{.}1\mathrm{.}2$ and list all signals on your diagram. Assume that a pneumatic valve positioner and a computer controller are used in this application.

Create a block diagram for problem #$1,$ remembering that each converter has its own block.

a$.$ What converters did you use in #$1,$ and why?

Figure P$2\mathrm{.}1\mathrm{.}4$ Control diagram of a tank with a level controller.

b$.$ What kind of level gauge would you use in this system, and why?

c$.$ Would you use a butterfly valve or a globe valve in this system, and why?

d$.$ Why is a valve positioner appropriate for this system?

e$.$ What would you change about the instrumentation and hardware if the tank were part of a bioprocessing unit?

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