【Daily Question 20090308】Are the thermoelectric properties of a compensation wire exactly the same as those of the thermocouple it is matched with?
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Are the thermoelectric properties of the compensation wire and the thermocouple it is matched with exactly the same? Answer: Compensation wires are cheaper than thermocouples. Within the range of 0–100 degrees, their thermoelectric properties are identical to those of the thermocouple they are used with. Therefore, compensation wires can be used to extend the cold end of the thermocouple to a control room or another location where it is convenient to take readings, and which is far away from the heat source ； Strictly speaking, however, the compensation wire is identical to the thermocouple potential. This post was last edited by Mobei Yihai on 2009-3-8 19:35.]
I don’t quite understand, but it seems like they’re not exactly the same.
Compensation wires are cheaper than thermocouples. Within the range of 0–100°C, their thermoelectric properties are identical to those of the associated thermocouple; therefore, using a compensation wire is like extending the thermocouple’s cold end to a control room or another location where reading is convenient, and which is far away from the heat source； However, strictly speaking, the compensation wire and the thermocouple potential are not exactly the same. For example: the compensation wire made of copper-constantan has a potential of 4.27 mV at 100°C, while the corresponding K-type thermocouple has a potential of 4.095 mV ； The compensation wire is copper-nickel-copper; its potential at 100°C is 0.643 mV, whereas that of the matching S-type thermocouple is 0.645 mV.
The characteristics are quite different! A compensation wire is a special type of wire used to extend the cold end of a thermocouple. When using it, pay attention to ensuring the correct model match; make sure there are no errors in connections. The temperature at the connection point between the thermocouple and the compensation wire should not exceed 100℃
It’s a bit different! A compensation wire is a special type of wire used to extend the cold end of a thermocouple. When using it, make sure the model matches, the polarity is correct, and the temperature at the connection point between the thermocouple and the compensation wire should not exceed 100°C.
The material of the compensation wire is inexpensive copper, copper-nickel, nickel-chromium, etc. It is similar to the thermoelectric effect of thermocouples.
The thermoelectric properties of the compensation wire and the thermocouple it is matched with are not exactly the same; the compensation wire only has a thermoelectromotive force similar to that of the thermocouple within the 0-100 degree range, while outside this range the difference in thermoelectromotive force is significant
The material of the compensation wire is inexpensive copper, copper-nickel, nickel-chromium, etc. It is similar to the thermoelectric effect of thermocouples. It serves to extend.