Differences between RTDs and Thermocouples:

1. Different Materials:

RTDs are made of metal materials sensitive to temperature (such as Cu50, Pt100, Pt1000, etc.), and the resistance value of these materials changes with temperature; thermocouples are made of two different bimetallic materials (such as platinum-rhodium/platinum, nickel-chromium/nickel-silicon, etc.), which generate a potential difference when the temperature changes, enabling temperature measurement.

2. Different Electrical Signals:

RTDs output resistance signals, while thermocouples output voltage signals.

3. Different Working Principles:

The working principle of RTDs is based on the characteristic that the resistance value of a conductor or semiconductor changes with temperature. When the temperature of the conductor increases, its resistance value changes. The working principle of thermocouples is based on the thermoelectric effect, where a thermocouple consists of two different conductors connected at both ends to form a circuit.

4. Different Measurement Ranges:

RTDs have a relatively narrow measurement range, while thermocouples have a very wide measurement range.

5. Different Application Scenarios:

Due to their high measurement accuracy and good stability, RTDs are widely used in low-temperature measurement scenarios. Due to their excellent high-temperature resistance and wide measurement range, thermocouples are widely used in high-temperature measurement scenarios.

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