3j-Consult has more than 25 years' experience with the “embedded probe” technique, the only reliable means of obtaining temperature measurements in an industrial furnace and within the thickness of the heated product.
At high temperatures, the magnesia traditionally used to insulate thermocouple sheaths becomes partially conductive, creating multiple "hot junctions" along the thermocouple. This phenomenon increases exponentially at temperatures above 950-1000°C. This reason alone warrants use of "short" large-diameter thermocouples for which measurements can be made using a probe that accompanies the product in the furnace.
Our inverse conduction software makes it possible to establish, through simulation calculations:
Surface skin temperatures,
Temperature at every point of the product's thickness.