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Examples

Every account includes these two plants. Open one, press Run, then change something and see what happens.

Level control

Level control example after four minutes of simulation: supply, pump P-101, control valve LV-101, tank T-101, level controller LIC-101 and a drain, with a trend of level and controller output.
What you see
A pump feeds a tank through a control valve while a hand valve drains it. The level controller LIC-101 reads the level and moves the control valve, and the trend shows level and controller output side by side.
What you learn
How feedback control holds a level at its setpoint, and how the controller output moves to cancel a disturbance such as opening the drain wider.

Gravity drain

Gravity drain example after four minutes of simulation: supply, hand valve HV-101, tank T-101, level transmitter, level controller LIC-101 and outlet valve LV-102 to a drain, with a trend of level and controller output.
What you see
A tank fills through a hand valve and drains by gravity through a control valve. The level controller opens the outlet as the level rises, and the trend shows the level and the controller output.
What you learn
Why the outlet flow depends on the level itself, and why this controller acts in the opposite direction from the one that controls an inlet.

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