Advantages of Thermocouples and RTD over Thermistors
- Because Thermistors are semiconductors, they are more susceptible to permanent de-calibration at high temperatures than are RTD’s or thermocouple.
- The use of thermistors is generally limited to a few hundred degree Celsius and manufacturers warn that extended exposures even well below maximum operating limits will cause the thermistor to drift out of its specified tolerance.
- Thermistors can be made very small which means they will respond quickly to temperature changes. It also means that their small thermal mass makes them especially susceptible to self-heating errors.
- Thermistors are good deal more fragile than RTD’s or thermocouple and they must be carefully mounted to avoid crushing or bond separation.