Delta: Analog I/O Modules (DVP04TC-E2)

Thermocouple Temperature Sensor | DVP-ES2 Series

The thermocouple is generated by Seebeck Effect. Generally, a thermocouple is composed of conductors of two different materials. When a temperature difference occurs at the two ends of the thermocouple, the thermocouple will generate a voltage signal in proportional to the temperature difference. The voltage signal ranges from tens of uV to thousands of uV; therefore, we need to magnify the voltage when using it.

The thermocouple temperature sensor indicates temperature by differential voltage, and it has already eliminated external interferences when two pairs of data are performing differential operation. Therefore, it is much more stable than a thermistor, resistive thermometer or thermal resistor and is widely applied in the industry. The thermocouple is a loop constructed by two different metallic wires welded or twisted together. Different metals make two junctions in the loop. One junction is called “measuring junction” or “hot junction”, and the other is “reference junction” or “cold junction”. Placing the two junctions in different temperatures will cause a loop voltage (i.e. Seebeck Effect), and the loop voltage is in proportional to the temperature difference between the two junctions.