Thermocouples and thermistors are not just a word difference

Although thermocouples and thermal resistors are only one word apart, many people think they are the same thing, but they are not the same thing. Today, Huahai manufacturer will take you to understand the differences between thermocouples and thermal resistors? 1. Materials for thermocouples and thermal resistors:

Thermocouple: Two different materials, such as platinum rhodium alloy and platinum, nickel chromium alloy, and nickel silicon alloy (the diversity of thermocouples is also indicated by the different conductor materials)

Thermistor: a single material, such as platinum resistance, copper resistance, etc

2. Temperature measurement range of thermocouples and thermal resistors:

Thermocouple: Conventional -50 ℃~+1600 ℃, Special -269~2800 ℃

Thermal resistance: PT100-200~420 ℃, CU50-50~150 ℃

PS: In terms of accuracy, thermocouples are more accurate for measuring high temperatures, while thermal resistors are more accurate for measuring low temperatures

3. Lead wires for thermocouples and thermal resistors:

Thermocouple: 2-wire, requires compensating wire

Thermistor: 2-wire, 3-wire, or 4-wire, usually 3-wire, no need for compensating wires

4. Thermocouple and Thermistor Materials Thermoelectric Effect:

Thermocouple: The thermoelectric effect of different materials (which produces changes in induced voltage that vary with temperature)

Thermistor: The resistance thermal effect of the same material (a thermistor itself is a resistor, and changes in temperature cause positive or negative resistance changes in the resistor)

5. Prices of thermocouples and thermal resistors:

Thermocouples: S-type precious metal materials are much more expensive than PT100 (thermocouples come in J, T, N, K, S and other models, some are more expensive than resistors, and some are cheaper than resistors, but including compensation wires, the overall cost of thermocouples is higher)

Thermistor: PT100 is slightly higher than K-type