The difference between Thermocouple and Thermal Resistance (RTD)

Many friends ask whether thermocouple and RTD are the same device, the correct answer is not the same device. Although both thermocouples and RTDS are used as temperature sensing elements, their principles, purposes, and temperature ranges are different.

Distinguish method 1: according to the structure to distinguish between thermocouples or RTDs, thermocouples are generally composed of heat electrodes, insulating tubes, protective sleeves and junction boxes and other parts, RTDs are the output of the sensor load and the power supply is connected in series.

Distinguish method 2: according to the label to determine whether it is thermocouple or RTD, the nameplate will be specific thermocouple or RTD specific products and specifications information, we just need to carefully observe and distinguish between thermocouples or RTDs can be distinguished.

Distinguish method 3: through the terminal block to determine, there is a positive and negative pole distinction is thermocouple, no positive and negative pole distinction is RTD. This distinction method is relatively simple, you can try oh.

Distinguish method 4: through the compensation line to judge, thermocouple need to choose different compensation line according to different models, connect the compensation line to increase the temperature stability of the thermocouple, and RTD does not need compensation wire, but RTD is also divided into different models.

Thermocouple and RTD are two different components, we need to carefully distinguish, do not get it wrong, we need to be clear about what components they need to do in the end, according to their actual needs, choose the RTD or thermocouple in line with their actual situation, more about the thermocouple of fresh information, we will be regularly updated.