For all the following dynamics models, characteristics can be modified (size, cv, response time, lag, PID parameters of controllers...), and variable trends can be displayed (measure, setpoint and controller output, other process variables). |
A liquid tank (named level tube), a ground tank, a volumetric pump with variable flow, a PID controller measuring the level, acting on a control valve to purge the level tube in the ground tank, a manual leak valve, and various ways to make process perturbations (hysteresis on valve command, unstable pump flow).
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A steel vessel is fed with compressed air through a control valve or its bypass. It is equiped with degazing and purge valves, and a relief valve in case of overpressure. A PID pressure controller can be used to illustrate various aspects of process control: process response, PID tuning, etc…
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