Thermocouple and compensation wire Q&A: Errors when connecting thermocouples with terminals, etc.

I will answer questions regarding the errors when connecting thermocouples with terminals, etc.!

In general instrumentation processes, thermocouple terminals are often gathered in a junction box and connected to compensation wires using a general-purpose terminal block. This results in dissimilar metal connections, but what is the error associated with this? A: In typical measurement methods, temperature is measured using thermocouples to reduce costs, and the measurement is extended to a distant instrument using compensation wires. Even with inexpensive base metal thermocouples (K, E, J, T), there is a price difference when comparing thermocouple wires and compensation wires, which is why compensation wires are used. At that time, the thermocouple and compensation wires are connected in a terminal box, often using commercially available standard terminal boards. Compensation wires have thermal electromotive force characteristics almost equivalent to those of thermocouples, but the metal plates used in terminal boards are mostly copper alloys, with both the positive and negative sides being of the same metal type. As a result, dissimilar metals may coexist in the thermocouple circuit, raising concerns about the occurrence of errors. *For more details, please refer to the PDF document or feel free to contact us.*

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