Thermocouple | Working Principles explain in తెలుగు

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Also I explained Rtd PT-100 Temperature sensor full details in belo llink

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In this video, we’re going to explain through one of the most commonly used temperature sensing devices… the thermocouple. We’ll discuss the basics of how they work.

A thermocouple is an extremely simple device used to measure temperature. Thermocouples tend to be inexpensive, durable, and can be fabricated into a variety of shapes and sizes.

A thermocouple is made up of two dissimilar metal wires. The metal wires are connected together in only one place, typically the tip of the thermocouple.

Thermocouple is where the two dissimilar metals are joined that will measure the temperature it's also called Hot junction.

The wiring terminals on the measuring instruments are most often called the cold junction.

The wires at the opposite end from the sensing junction are then left available to connect to some kind of measuring instrument like a temperature transmitter, a simple electronic display unit, or even directly to a PLC thermocouple input card.

All thermocouples work the same way. They generate a small voltage when they are exposed to heat.

A thermocouple works based on the movement of the electrons in its metal wires due to the heat difference between the hot and cold junctions.

The different metals in those wires, or more accurately the electrons in those different metal wires, react differently to heat.

The more heat you apply to the metal wires, the more the electrons want to move around, and the more they move away from the heat.

With the two different types of metal wire, the difference in the voltage will increase and decrease with changes in heat at the sensing point.
Types of thermocouples are K. T. J. N. E. and B. R. S
K. T. N. E thermocouples are Base metal sensors meterial used such as Copper. Nickel and Aluminum.
B. R. S thermocouples are Nobel metal sensors material used such as Platinum. Rhodium and Rhenium.
A Type-K thermocouple is probably the most commonly used thermocouple in industrial applications because it responds predictably across a very wide range of temperatures.

Type-K thermocouples are made from the metal alloys Chromel and Alumel.
Type-T thermocouples are made from the metal alloys Copper and Constantan.
Type-J thermocouples are made from the metal alloys Iron and Constantan.
Type-N thermocouples are made from the metal alloys Nicrosil and Nisil.
Type-E thermocouples are made from the metal alloys Chromel and Constatan
Type-B thermocouples are made from the metal alloys Platinum and Rhodium.
Type-R and S thermocouples are made from the metal alloys Platinum+rhodium and Platinum.

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