however the system is no longer a purely capacitive one. We also notice that the system has an offset from the original steady-state: this offset will be smaller if the gain of the controller is increased. Normally there is a maximum value of the gain allowable or the process will become unstable.(If the process was truly first order (as it is in this case) the process will never become unstable with proportional only control. In real processes the dynamics of the final control elements and the sensors, while fast, are still there, making the process have an order greater than one)