Jinan Hydeb Thermal Tech Co., Ltd.
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The primary function of a thermocouple is to measure temperature.
It does this by generating a small electrical voltage (known as the Seebeck voltage or thermoelectric EMF) that is directly proportional to the temperature difference between its two ends. This voltage is then measured and converted into a temperature reading by a connected instrument.
A thermocouple consists of two wires made of dissimilar metals joined together at one end (called the measuring junction or hot junction). The other ends are connected to a measuring instrument (forming the reference junction or cold junction).
1. When the measuring junction is exposed to heat, a voltage is generated due to the Seebeck effect.
2. This millivolt-level voltage is measured at the reference junction.
3. Since the voltage depends on the difference in temperature between the two junctions, the temperature of the reference junction must be known (usually through automatic compensation in the measuring device) to accurately determine the temperature at the measuring junction.