Question

(a) Draw a graph of the output emf from a chromel-alumel thermocouple (type K) and from a copper-constantan thermocouple (type T) over the temperature range from 0 C to 550 C by reading appropriate data from a thermocouple table. Assume that the reference junction of the thermocouple is maintained at 0 C in an ice bath. Draw the graphs for both thermocouples on the same piece of graph paper.

(b) Calculate the measurement sensitivity of each thermocouple over the temperature range from 250 C to 400 C.

Answer 1

(a).

K-Type Thermocouple:

T-type Thermocouple: (range is limited up to 400^o C)

T-V Plot:

(b).

K-Type:

Output voltage at 250^o C = 10.153 mV

Output voltage at 400^o C = 16.397 mV

Sesativity:

T-Type:

Output voltage at 250^o C = 12.013 mV

Output voltage at 400^o C = 20.872 mV

Sesativity:

​​​​​​​