Pt100 vs Pt1000
Side by side comparison: how they work, where each fits, and which to choose.
Quick answer: Both follow the same IEC 60751 curve. Pt1000 has ten times the resistance, so lead wires cause ten times less error; Pt100 remains the industrial standard.
Pt100 vs Pt1000: Comparison Table
| Aspect | Pt100 | Pt1000 |
|---|---|---|
| Resistance at 0 °C | 100 Ω | 1000 Ω |
| Sensitivity | about 0.385 Ω/°C | about 3.85 Ω/°C |
| Lead wire effect | Needs 3 or 4 wire | Often fine with 2 wire on short runs |
| Self heating | Lower at the same current | Higher, so smaller currents are used |
| Common use | Process industry transmitters | HVAC, building automation, battery devices |
| Tolerance classes | IEC 60751 AA, A, B, C | Same classes |
Choose Pt100 when
- Process plants with standard transmitters
- When spares and interchangeability matter
Choose Pt1000 when
- 2 wire connections to controllers
- Low power electronics and HVAC
Key Differences Explained
The ratio R/R₀ is identical, so the same temperature tables apply after multiplying by ten. The input device must be set to the right element, or the reading will be far off.
Pt1000 is not more accurate in itself; it only makes wiring errors smaller.
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Frequently Asked Questions
What is the difference between Pt100 and Pt1000?
Both follow the same IEC 60751 curve. Pt1000 has ten times the resistance, so lead wires cause ten times less error; Pt100 remains the industrial standard.
Can I replace a Pt100 with a Pt1000?
Only if the input is reconfigured for Pt1000.
Is Pt1000 more accurate?
The element accuracy class is the same; the system error is often lower because lead resistance matters less.
What does Pt100 read at 25 °C?
About 109.73 Ω; a Pt1000 reads about 1097.3 Ω.
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