This is a question often asked by many guests. Let me ask you and answer it: as we all know, thermocouple wire plays the same role as thermocouple and is used to measure temperature. The compensation wire alloy wire is only used to extend the thermocouple signal to the instrument reading the signal, which is divided into two types: compensation wire alloy wire (KC) and extension wire (KX). The wire of compensation wire alloy wire is generally made of alloy materials with the same or similar thermoelectric potential as the thermocouple body in low temperature environment (generally 0 ~ 150 ℃), For example, the alloy material of K-type thermocouple (+ nichrome nickel aluminum), KX material is also + nichrome nickel aluminum, while the alloy material of KC compensation wire is (+ copper constantan). Within the temperature range within 100 degrees, the alloy wire of compensation wire and K-type thermocouple have similar thermoelectric potential, and the price is much cheaper than that of KX extension wire, which has achieved the balance of performance and price. However, when the temperature exceeds 100 ℃, the thermoelectric potential of KC will conflict with that of K-type thermocouple, affecting the accuracy.
Therefore, we can generally see that the alloy wire of KC compensation conductor uses PVC insulating material, because the high service temperature of PVC insulating material is only 105 ℃. The alloy material used for KX conductor is the same as that of K-type thermocouple. It can be used at high temperature and has little impact on the accuracy, but the price is more expensive than KC conductor. It should be emphasized that thermocouple wires can be used as thermocouple extension wires, but thermocouple extension wires cannot be used as thermocouple wires.
Therefore, we can generally see that the alloy wire of KC compensation conductor uses PVC insulating material, because the high service temperature of PVC insulating material is only 105 ℃. The alloy material used for KX conductor is the same as that of K-type thermocouple. It can be used at high temperature and has little impact on the accuracy, but the price is more expensive than KC conductor. It should be emphasized that thermocouple wires can be used as thermocouple extension wires, but thermocouple extension wires cannot be used as thermocouple wires.
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