High-precision platinum-based temperature sensor for industrial chemical heating systems
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Accuracy | ±0.1 °C at 0 °C, ±0.3 °C at 100 °C, Class A per IEC 60751 °C | Class A tolerance for Pt100 sensors; Class B (±0.3 °C at 0 °C) acceptable for less critical loops.IEC 60751 |
| Resistance | 100 Ω at 0 °C (Pt100) or 1000 Ω at 0 °C (Pt1000) Ω | Pt100 is standard; Pt1000 for higher sensitivity and lower lead resistance effects.IEC 60751 |
| Response Time | 0.5–5 s (time constant, τ63) depending on sheath diameter and insertion depth s | Faster response for smaller diameter and thinner sheath; typical for 6 mm sheath in water flow.IEC 60751 |
| Connection Type | 2-wire, 3-wire, or 4-wire; M12 connector, terminal head, or flying leads | 4-wire for highest accuracy; 3-wire compensates lead resistance; 2-wire for cost-sensitive. |
| Sheath Diameter | 3–12 mm (standard 6 mm) mm | Smaller diameter for faster response but less mechanical strength; 6 mm common for chemical processes. |
| Protection Class | IP65 (standard), IP68 (submersible) or IP69K (high-pressure washdown) | IP65 for dry indoor; IP68 for immersion; IP69K for aggressive cleaning.IEC 60529 |
| Temperature Range | -50 to 500 °C (standard), up to 850 °C for high-temp version °C | Extended range requires ceramic insulation and Inconel sheath; above 500 °C, use Pt100 with ceramic element.IEC 60751 |
| Wire Configuration | Single or dual element (2×Pt100); lead wire length 1–10 m | Dual element for redundancy; lead wire length affects response and accuracy. |
| Continuous operation | -50 to 500 °C (standard), up to 850 °C (high-temp) | Outside this window: Above 850 °C, platinum element drifts and insulation degrades; below -50 °C, accuracy degrades. |
| Process pressure | Up to 100 bar (static) for 6 mm sheath; derate above 200 °C | Outside this window: Exceeding pressure rating causes sheath collapse or rupture. |
| Vibration | Up to 20 g at 10–500 Hz (depending on mounting) | Outside this window: Excessive vibration leads to wire breakage or short circuit. |
| Chemical exposure | 316L sheath for general chemicals; Inconel 600 for corrosive or high-temp; PTFE coating for strong acids | Outside this window: Material incompatibility causes corrosion and sensor failure. |
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This component is used in the following industrial products
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2-wire RTDs are simplest but include lead wire resistance in measurement. 3-wire RTDs compensate for lead resistance in balanced bridge circuits. 4-wire RTDs provide highest accuracy by completely eliminating lead resistance effects through separate current and voltage measurement paths.
Annual calibration is recommended for critical processes. More frequent verification (quarterly) may be required for applications with strict temperature control requirements or harsh chemical environments.
Yes, with appropriate intrinsically safe barriers or explosion-proof housings certified for hazardous locations (ATEX, IECEx).
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