The time constant of a thermocouple is
A
The time taken to attain the final temperature to be measured
B
The time taken to attain 50% of the value of initial temperature difference
C
The time taken to attain 63.2% of the value of initial temperature difference
D
Determined by the time taken to reach 100°C from 0°C
Correct Answer: The time taken to attain 63.2% of the value of initial temperature difference
The Time Constant of a thermocouple is defined as the time required for the sensor to respond to 63.2% of its total output signal when subjected to a step change in temperature.