Besides many more patents, three key principles led to a technical and scientific breakthrough in temperature measurement technology. The first is the thermoelectric principle which redefined the way thermoelectric voltage is created. In a nutshell, the highest voltage occurs with the highest temperature gradients. The second principle concerns drift of the thermocouples, which had until then presented a significant problem in heat-treatment processes. Dr. Körtvélyessy changed the diameter of the two thermocouples. Ageing still occurs but now both wires age at the same pace so that the correct thermoelectric voltage is always produced. The third principle is the introduction of very thin and separate ceramic protective tubes into a connecting head in contrast to the thick ceramic protective tubes, which were common then and still are, and the introduction of an empty tube, which is fitted with a test thermocouple for checking purposes.
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