The s-domain transfer function of the electric furnace system, Gp(s), was formulated (Paulusov and Dbravsk, 2012) as stated in (1). The time-delay (or transport lag) in (1) is approximated by (2). Then, the s-domain transfer function of the electric furnace system in (1) can be rewritten as expressed in (3). The model Gp(s) in (3) will be used as the plant in the control loop shown in Fig. 1.