Question

For a thermocouple the neutral temperature is $270^{o} ⥂ C$ when its cold junction is at $20^{o} ⥂ C$. What will be the neutral temperature and the temperature of inversion when the temperature of cold junction is increased to $40^{o} ⥂ C$

• A. $290^{o}C,580^{o}C$
• B. $270^{o}C,580^{o}C$
• C. $270^{o}C,500^{o}C$
• D. $290^{o}C,540^{o}C$

Answer 1

Answer: (C)

$270^{o}C,500^{o}C$

Answer 2

No change in neutral temperature but temperature of inversion is $t_{i} = 2t_{n} - t_{c}$⇒ $t_{i} = 2 \times 270 - 40 = 500^{o}C$