Answer / i.ps tomer

Thermocouple is an active device which produce milli-volt output corresponding to the applied temperature whereas RTD is passive device it dose not produce any type of energy itself. The device convert one type of energy into another type of energy is called transducer. Hence themocouple is a transducer as it is converting the heat energy into electrical energy ie millivolt but rtd is not converting the heat energy into any other type of energy, it is changing the self resistance only according to heat applied

Answer / guest

A therocouple is composed of two unlike metals connected
together. The unlike metals produce a milivolt output
signal, which varies in relation to temperature difference
detected at the junction (heat applied at the junction
increases milivolt output). The therocouple is connected to
a converter (transducer) which takes the milivolt input
signal to a milliamp output signal (usually 4 to 20
milliamps) to a temperature control device.
The standard 100 ohm RTD elements used in probe type
assemblies are made of pure platinum wire wound about a
ceramic or glass core and hermetically sealed within a
ceramic or glass capsule. The sensor varies resistance in
relation to temperature change.
Both devices serve the same purpose of detecting
temperature, the RTD varies resistance, the therocouple
produces voltage.

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