What is the difference between thermistor and thermocouple?

Answer

Thermocouples produce a measurable voltage as the surrounding temperature increases or decreases, where thermistors change their resistance to electrical current as the temperature changes. Also, thermocouples and thermistors are used in different applications, depending upon the precision needed and the temperature ranges involved.

Thermocouples exploit the fact that when two dissimilar metals are joined together and in the presence of changing temperatures, a difference in the electrical potential, or voltage, between the two metals changes. This is known as the Seebeck Effect, named after its discoverer, Thomas Seebeck. Thermocouples are used in high-heat applications, typically where they are the only viable option. However, when compared to thermistors, thermocouples are not as precise or accurate and often need recalibration before and after each use.

Thermistors, on the other hand, are restricted to lower-temperature applications but have much better accuracy and reliably track changes far more precisely than the average thermocouple. Because they are small, lightweight and very accurate, thermistors are more often used in conjunction with microprocessors and data recording units. Thanks to their smaller sizes, thermistors are often arranged with redundant counterparts for data integrity. Since they produce such large, proportional changes in resistance for a given change in temperature, thermistors provide a much more accurate representation of the actual changes in temperature.

Q&A Related to "What is the difference between thermistor and..."
Thermocouples generate a small voltage that is directly proportional to temperature. Thermistor is a resistor with a non-linear resistance vs temperature characteristic.
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Dear Noname: You have to explain the difference between a thermistor and a thermocouple to a group of non-technical people. It would be very helpful to know the purpose of this explanation
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one is called a thermostat and the other is called a thermistor - Ross Henderson.
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The measuring junction is the junction that is placed into the material to measure the temperature. The grounded junction has wires inside a protective metal sheath. The wires are
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1 Additional Answer
Ask.com Answer for: difference between thermistor and thermocouple
The Difference Between a Thermistor & a Thermocouple
Thermistors and thermocouples are both measuring devices that can be used to measure temperature. However, they work based on different principles and are set up differently. Whether you want to use a thermistor or a thermocouple for your purpose depends... More »
Difficulty: Easy
Source: www.ehow.com
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