exciting changes and developments has been detected from manually operated button systems of the furnace control system to the pc based control system. Programmable logic control technology is an important tool in helping plant managers achieves their goals of reduced furnace operator involvement, consistent product quality, and less furnace down time. Most modern heater controllers are equipped with a plc require only that the operator load/unload the furnace, select the recipe to be run, and push the start button. Troubleshooting has greatly been simplified. Since all inputs and outputs go through the plc, their status can be monitored at all times and changes executed easily without rewiring. Alarm and status messages can be programmed, as well as self diagnostic test routines to aid in troubleshooting. Reliable and accurate in-process temperature surveying for solution heat treating, annealing, brazing, homogenizing, decorating, tempering, forming, frit sealing, normalizing, billet reheating, slab reheating, pressure and vacuum processes and more.