Standard Resistance Thermometer Data
Temperature sensors are usually supplied with thin-film elements. The resistance elements are rated in accordance with BS EN 60751:2008 as:
| Tolerance Class | Valid Range |
|---|---|
| F 0.3 | -50 to +500 °C |
| F 0.15 | -30 to +300 °C |
| F 0.1 | 0 to +150 °C |
Resistance thermometer elements can be supplied which function up to 1000 °C. The relation between temperature and resistance is given by the Callendar-Van Dusen equation,
Here, is the resistance at temperature T, is the resistance at 0 °C, and the constants (for an alpha=0.00385 platinum RTD) are
Since the B and C coefficients are relatively small, the resistance changes almost linearly with the temperature.
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