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Thermocouple Compensating-Wire Loop Resistance Calculator
A thermocouple loop has no supply of its own, so its total resistance is a design constraint rather than a detail. This calculator returns the loop resistance of a run and compares it against the maximum external resistance your instrument is specified for. The whole calculation is Ohm’s law on a there-and-back conductor pair; it stays in your browser.
Enter a run length, a cross-section and a resistivity.
The loop is counted as two conductors over the same one-way distance.
What the calculator assumes, stated plainly
The resistivity list is a set of entry points, not a specification. Extension and compensating alloys differ leg by leg and grade by grade, and only the datasheet for the wire you are buying carries the value that belongs in this box. The calculation applies one resistivity to both legs, so for an alloy pair with dissimilar legs the honest reading is a band: run the calculation once per leg and add the two one-way results.
Loop resistance is a wiring constraint. It is separate from tolerance, which IEC 60584-3 expresses in microvolts against the temperature relationship of IEC 60584-1, and this calculator says nothing about the tolerance grade of any cable.
