This is the most frequently used thermocouple, and it consists of positive (Iron) and negative (Constantan) legs. The applications of this thermocouple include reducing, vacuum, oxidizing and inert environments. The temperature range of this thermocouple is low and lifespan is lesser at high-temperature compare with K-type. It is equal to the K-Type in conditions of reliability and expense.

Technical Specification:

• Composition:  Iron (+) and Constantan (-) legs
• Temperature Range: –210 to +1200 °C
• Accuracy: +/- 2.2C (or) +/- .75% particular error limits: +/- 1.1C (or) 0.4%
• Sensitivity: 50-60 µV/°C

Features:                      

• To measure temperature it provide good linearity of emf
• Highly stable output
• Comparatively cost effective than other thermocouple

Applications:

• Appropriate for use in vacuum, air, reducing, or oxidizing atmospheres to 760°C (1400°F) in the heavier gage sizes