🔧 What is a Thermocouple ?
A thermocouple is a temperature sensor used to measure temperature in industrial and commercial applications.
It works on the Seebeck effect: when two dissimilar metal wires are joined and exposed to temperature, they generate a small voltage that corresponds to temperature.
📌 Types of Thermocouples (Most Common)
1️⃣ Type K (Chromel–Alumel)
Range: −200°C to +1260°C
Use: General purpose, furnaces, boilers, motors
2️⃣ Type J (Iron–Constantan)
Range: −40°C to +750°C
Use: Plastics, heating equipment
3️⃣ Type T (Copper–Constantan)
Range: −200°C to +350°C
Use: Low-temperature and laboratory applications
4️⃣ Type E (Chromel–Constantan)
Range: −200°C to +900°C
Use: High sensitivity, cryogenic use
5️⃣ Type N (Nicrosil–Nisil)
Range: −200°C to +1300°C
Use: High-temperature, more stable than Type K
6️⃣ Type R / S (Platinum-based)
Range: 0°C to +1600°C
Use: High-accuracy, furnaces, glass & metal industries
⚙️ Uses of Thermocouples
✔ Temperature measurement in PLC & DCS systems
✔ Boilers, furnaces, ovens
✔ Power plants & oil & gas industries
✔ HVAC systems
✔ Manufacturing & process industries
✅ Advantages
Wide temperature range
Fast response time
Rugged and reliable
Cost-effective
