Advantages of RTD | disadvantages of RTD

This page covers advantages and disadvantages of RTD. It mentions RTD advantages or benefits and RTD disadvantages or drawbacks.

RTD stands for Resistance Thermometer. It has positive temperature coefficient i.e. its resistance increases with increase in the temperature.

The figure-1 depicts voltage versus temperature curve of RTD. It can be used in the range from -250 to 10000C.

RTD curve

➨Sensitivity order: Thermistor > RTD > Thermocouple
➨Linearity Order: RTD > Thermocouple > Thermistor

Benefits or advantages of RTD

Following are the benefits or advantages of RTD:
➨They are most stable.
➨They are most accurate.
➨Linearity is higher compare to thermocouples.

Drawbacks or disadvantages of RTD

Following are the disadvantages of RTD:
➨They are passive i.e. current source is needed.
➨They are very expensive.
➨Self heating
➨Less rugged compare to thermocouples.
➨Small change in resistance with temperature.

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