3. The experimental process reaction curve of the concentration control of the effluent with a PID controller is shown in the figure. The step change of the manipulated input was increased from 50% to 60%. a) Using the data from the graph, approximate the open-loop response of a first order plus dead time system. (i.e. find the values of K= output (at the steady)input(at the steady), "output (at the steady)slope at the point of inflection and t time elapsed until the system responded). b) Select the controller settings using the Cohen-Coon technique. (Ke=K1td(34+4td);l=td13+8td32+6td;D=td11+2td4)