Comparison Chart
| Basis for Comparison | RTD | Thermocouple |
|---|---|---|
| Operating Principle | Temperature changes with a change in resistance. | Temperature changes with change in emf generated. |
| Response time | 1 – 50s | 0.1 – 10s |
| Cost | High | Low |
| Operating range | -200 to 600°C | -200 to 2000°C |
| Physical size | Large | Comparatively small |
| Sensitivity | Low | Quite high |
| Accuracy | More | Less |
| Self-heating | Exist | Not Exist |
| Stability | More | Comparatively less |
| Output | Linear | Non-linear |
| Applications | Used to measure engine temperature along with the temperature of amplifier and oil temperature sensor, etc. | Measures the temperature of chemical and petroleum plants and detects the temperature of metals and aluminum for industrial purposes. |
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