Which is more accurate, a thermistor or a thermocouple?
June 26, 2025
Thermistor
| Sensor type | Thermistor | RTD | Thermocouple |
|---|---|---|---|
| Temperature Range (typical) | -100 to 325°C | -200 to 650°C | 200 to 1750°C |
| Accuracy (typical) | 0.05 to 1.5°C | 0.1 to 1°C | 0.5 to 5°C |
| Long-term stability @ 100°C | 0.2°C/year | 0.05°C/year | Variable |
| Linearity | Exponential | Fairly linear | Non-linear |
| Power required | Constant voltage or current | Constant voltage or current | Self-powered |
| Response time | Fast 0.12 to 10s |
Generally slow 1 to 50s |
Fast 0.10 to 10s |
| Susceptibility to electrical noise | Rarely susceptible High resistance only |
Rarely susceptible | Susceptible / Cold junction compensation |
| Cost | Low to moderate | High | Low |