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PT100 and PT1000 accuracy at 500 °C
What IEC 60751 allows a platinum resistance thermometer at 500 °C, class by class, and what the rest of the measurement adds.
Tolerance by class
| Class | Tolerance (°C) | PT100 (Ω) | PT1000 (Ω) |
|---|---|---|---|
| AA | not defined at this temperature | ||
| A | not defined at this temperature | ||
| B | ±2.80 | ±0.933 | ±9.33 |
| C | ±5.60 | ±1.865 | ±18.65 |
At 500 °C
- Resistance
- 280.978 Ω · 2809.78 ΩPT100 / PT1000
- Sensitivity
- 0.3331 Ω/K · 3.331 Ω/KPT100 / PT1000
Example: the whole measurement
| Term | Assumption | Error |
|---|---|---|
| Sensor tolerance | PT100, Class B | ±2.800 K |
| Lead wires | 3-wire, 10 m, 0.5 mm² | ±0.052 K |
| Transmitter input | ±0.1 K | ±0.100 K |
| Analog output | ±0.03 % × 600 K | ±0.180 K |
| Ambient effect | ±0.1 % / 10 K × 20 K | ±1.200 K |
| Total probable error | RSS | ±3.05 K |
| Worst case | Σ | ±4.33 K |
An example with typical datasheet figures, not a statement about any product. Enter your own values in the calculator.
How the tolerance is defined
IEC 60751 gives each class as ±(a + b·|t|) °C within its own temperature range: AA 0.1 + 0.0017·|t|, A 0.15 + 0.002·|t|, B 0.3 + 0.005·|t|, C 0.6 + 0.01·|t|. The ranges here are those for wire-wound elements; thin-film elements often have narrower ones, so check the datasheet. The same limits in °C apply to PT100 and PT1000; in ohms the PT1000 figure is ten times larger.
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