I am currently building a 3Kw electric heat treat oven. The only item I am concerned about is the K type thermocouple for the Watlow controller. This is encased in a 5mm diameter rod which will enter the chamber from the rear to expose about 25mm. My feeling is that I should cover the tip with a steel cap of similar thickness to the item that I am heat treating, that way the sensed temperature will be relative to that seen by the part. Any comments? and how is the thermocouple handled in a professional oven? My controller does have a "ramp at n deg/min" capability.