Calibrating (calibration charts) of thermocouple : chromel - kopel (ТCК, Type L). Range of temperatures from - 20 °C to 200 °C
Dependence E.M.F. thermocouple : chromel - kopel from a temperature for a condition, when a free end (shut) of thermocouple is at the zero of degrees celsius.
Chromel - Copel thermocouple (TCC, Type L) have the highest differential sensitivity of all commercially available thermocouples. Chromel-Copel thermocouples are used for more accurate temperature measurements, as well as for measuring small quantities to the temperature difference. Chromel-Copel thermocouples have a very high thermoelectric stability in the range up to 600 ° C. This is explained by the fact that changes in the thermopower hromelevogo and Copel thermoelectrodes cancel each other out, as directed in the same direction. Chromel-Copel thermocouple can operate stably tens of thousands of hours.
The disadvantages include relatively high TCA compared with other thermocouples sensitivity to deformation.