kylmäliitäntäanturi

A kylmäliitäntäanturi, or cold junction sensor, is a type of temperature sensor used to measure the temperature at the junction of two dissimilar metals, typically in a thermocouple. Thermocouples generate a voltage that is proportional to the temperature difference between their measuring junction and a reference junction. To accurately determine the temperature at the measuring junction, the temperature of the reference junction, known as the cold junction, must also be known. The kylmäliitäntäanturi provides this crucial reference temperature measurement.

Common types of kylmäliitäntäanturi include thermistors, RTDs (resistance temperature detectors), and semiconductor-based temperature sensors. These sensors are placed at the electrical termination point of the thermocouple wires. The signal from the kylmäliitäntäanturi is then used by the measuring instrument to compensate for the cold junction temperature. This compensation allows for a true and accurate reading of the temperature being measured by the thermocouple itself. Without proper cold junction compensation, the temperature readings from a thermocouple would be significantly inaccurate, especially when ambient temperatures fluctuate. The accuracy of the cold junction sensor directly impacts the overall accuracy of the thermocouple system.