Furnace Controllers are used to control temperature, heat delivery and other variables in industrial furnaces. They control the burner flame, air mixture and trim to maintain & optimize furnace performance. Furnace controllers receive inputs from thermocouples & sensors and integrated with other industrial control systems. Specifications for furnace controllers include form factor or mounting style, number of inputs, number of outputs, input types and output types. Furnace controllers send inputs or receive outputs in serial, parallel, ethernet or other digital formats, which indicate a process variable.