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In the figures, both the PI diagram and the block diagram for a control loop regulating the level H in a tank by controlling
In the figures, both the PI diagram and the block diagram for a control loop regulating the level H in a
tank by controlling the outlet fiow Qu can be seen. Variations in the inlet flow Qi occur as disturbances
to the system. The signals shown in the block diagram are deviations from steadystate values."
styrer it is means controls
"The tank is cylindrical with a crosssectional area of and a total height of The level
transmitter has a measurement range of meaning it converts to
"The time constant of the level transmitter is seconds."
"The control valve converts the control signal y into flow The time
constant of the control valve is seconds. The controller is a proportional controller with gain
The bias offset is not shown in the block diagram
A Set up a model for the tanks contents and explain, based on the PI diagram at the top, why the
'Process' block in the bottom block diagram has the signals, units, constants, and transfer functions
it has!
B How much does the level increase after a setpoint SP step?
C If the setpoint SP is increased in a step of what steadystate error offset occurs on the level
D Is the found 'offset' above what you would expect? Explain!
E rite down the transfer function hsqisfor fixed Qu ie qus
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