RTD vs Thermistor: RTD is Resistance Temperature Director, and Thermistor is Thermal Resistor. The comparison between RTD and thermistor is given in the Table given below.
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Comparison between RTD and thermistor
Difference between RTD and Thermistors are given in the table below
| RTD | Thermistor |
|---|---|
| It is made up of metals. | Thermistor is made up of semiconductor materials. |
| Since metals have a positive temperature coefficient (PTC) of resistance, its resistance is directly proportional to temperature | Since semiconductor materials have a negative temperature coefficient (NTC) of resistance, it’s resistance is inversely proportional to temperature. |
| Has linear resistance temperature characteristics | Has non-linear resistance temperature characteristics |
| Less sensitive to temperature | Highly sensitive to temperature. |
| Has wide operating range i.e., –200°C to 650°C | Has a narrow operating range i.e., –100°C to 300°C |
| Larger in size | Smaller in size. |
| Costlier when compared to a thermistor. | Cheaper when compared to RTD |
| Has low self-resistance. | Has high self-resistance. |
| Provides high degree of accuracy and long-term stability. | Provides an accuracy of ± 0.01°C. |
| Used in laboratory and industrial applications | Used in dynamic temperature measurement |
Read Also: Transducer Types, Parts, Working, Applications with Examples
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