Lämpöparit

Lämpöparit, known in English as thermocouples, are temperature-measuring devices. They operate on the principle of the Seebeck effect, which is a thermoelectric phenomenon. When two dissimilar metals are joined at two points, and these points are kept at different temperatures, a voltage is generated between the two metals. This voltage is proportional to the temperature difference between the junctions.

A typical thermocouple consists of two wires made of different metals, joined at one end to form a measuring junction. The other ends are connected to a measuring instrument, such as a voltmeter or a data acquisition system, forming the reference junction. The voltage produced by the thermocouple is then measured, and using known calibration data or equations, the temperature at the measuring junction can be determined. The choice of metals used for the thermocouple determines its temperature range and sensitivity. Common thermocouple types include Type K (chromel-alumel), Type J (iron-constantan), and Type T (copper-constantan), each suited for different applications and temperature ranges. Lämpöparit are widely used in industrial processes, scientific research, and many everyday applications due to their robustness, wide temperature range, and relatively low cost.