Question

Find the neutral temperature and inversion temperature of a copper-iron thermocouple if the reference junction is kept at 0°C. Use the data in the table (33.1).

Answer 1

The neutral temperature of copper-iron thermocouple is  328.57°C

Explanation:

θ = 0°C

• aCu,Fe = aCu,Pb – aFe,Pb = 2.76 – 16.6 = -13.8 μv/°C
• BCu,Fe = bCu, Pb – b Fe,Pb = 0.012 + 0.030 = 0.042μv/°C^2
• Neutral temp. on - a/b = 13.8/0.042°C = 328.57°C

Thus the neutral temperature of copper-iron thermocouple is  328.57°C

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Answer 2

Copper-iron thermocouple’s neutral temperature is 330 °C and the inversion temperature is 659°C.

Explanation:

Neutral temperature shown by the equation, $\theta n=-a b$

$a C u F e=2.76-16.6=13.84 \mu V^{\circ} C-1$

$b C u F e=0.012+0.030=0.042 \mu V^{\circ} C-2$

So, the neutral temperature is $\theta n=-\text { aCuFebCuFe }=13.840 .042=330^{\circ} \mathrm{C}.$

It is to be known that the neutral temperature doubles to form the inversion temperature. So, it is 659 degree Celsius.