The difference between the thermocouple of the wall-hung boiler and the NTC

　　Both NTC thermistors and thermocouples are commonly used temperature measurement and control materials. NTC thermistors and thermocouples have the same function but work differently and the choice between the two should depend on the needs of the user and the application they want to accomplish.

　　The basic principle of thermocouple temperature measurement is to weld conductors or semiconductors A and B of two different materials to form a closed loop. When there is a temperature difference between the two sticking points 1 and 2 of conductors A and B, an electromotive force is generated between the two, and a large current is formed in the loop. This phenomenon is called the thermoelectric effect. Thermocouples use this effect to work.

　　Thermocouples have two main wires (each made of a different metal) soldered to a junction. They are used because they can handle extreme temperatures. Versions constructed with precious metal fittings can withstand high temperatures up to 3272°F / 1800°C.

　　NTC refers to the thermistor phenomenon and material whose resistance decreases exponentially with increasing temperature and has a negative temperature coefficient. The material is a semiconductor ceramic made of two or more metal oxides, such as manganese, copper, silicon, cobalt, iron, nickel, and zinc, which are fully mixed, formed, and sintered. It can be made into a negative temperature coefficient. (NTC) thermistor. Its resistivity and material constant vary with the proportion of material composition, sintering atmosphere, sintering temperature and structural state. Now there are also non-oxide NTC thermistor materials represented by silicon carbide, tin selenide, tantalum nitride, etc.

　　NTC thermistors use metal oxide beads encapsulated in epoxy or glass. Commonly used NTC thermistors (negative temperature coefficient) have a great price advantage. Depending on the construction, the price and performance of the thermistor will vary, but the device does come with standard benefits. Thermistors are very sensitive and can be made small (the same size as the pins) for sensing in tight spaces.

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