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Tinned terminals and cables with tinned conductors are therefore always preferable to bare copper. Although tin is much higher than iron on the electrochemical scale, its reactivity is reduced by surface passivation. A frequently asked question is whether thermocouple wires can be connected to the compensating cable or extended using standard copper or brass terminals. Apart from the corrosion aspect at the point of contact of two dissimilar metals, this is definitely possible. Interposing one or two terminals in one or both legs of a thermocouple or of the compensating cable is quite acceptable, as long as the temperature at both sides of the terminal is the same.

However, the resistance of the compensating cable can easily reach several ohms, especially with thermocouples containing constantan (Fe-Con, Cu-Con, NiCr-Con), because constantan is a poor conductor that is also used for the manufacture of wire-wound resistors. So a loop resistance of several ohms, measured at the terminals of the indicating instrument or the controller, does not always indicate an unusually high contact resistance. 05 Table 14: Resistances of compensating cables and thermocouple cables The easiest way to simulate a thermocouple is with a millivolt calibration unit connected directly to the indicating instrument.

To keep the size of the temperature sensor down, nominal values of 25 or 10Ω are used for such precision instruments in the range above 600°C. Wires with a diameter of less than 30 µm are used in sensors manufactured using normal industrial techniques. (In comparison, the thickness of a human hair is approx. 100 µm). 1 Calculating the temperature from the resistance When used as a thermometer, the sensor resistance is used to determine the corresponding temperature. However, the formulae above only indicate the variation of resistance with temperature, not the determination of the temperature from the measured resistance.

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