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B-Type Thermocouple Wire for Extreme Heat Environments Accurate Thermal Detection
Product Description
Type B Thermocouple Wire
Product Overview
Type B thermocouple wire is a high-performance precious metal thermocouple consisting of two platinum-rhodium alloys: a positive leg with 30% rhodium and 70% platinum, and a negative leg with 6% rhodium and 94% platinum. Designed for extreme high-temperature environments, it is the most heat-resistant among common precious metal thermocouples, excelling in stability and oxidation resistance at temperatures exceeding 1500°C. Its unique dual-platinum-rhodium composition minimizes drift caused by platinum evaporation, making it ideal for long-term high-temperature measurement.
Standard Designations
- Thermocouple Type: B-type (Platinum-Rhodium 30-Platinum-Rhodium 6)
- IEC Standard: IEC 60584-1
- ASTM Standard: ASTM E230
Key Features
- Extreme Temperature Resistance: Long-term operating temperature up to 1600°C; short-term use up to 1800°C
- Low EMF at Low Temperatures: Minimal thermoelectric output below 50°C, reducing cold junction error impact
- Superior High-Temp Stability: ≤0.1% drift after 1000 hours at 1600°C
- Oxidation Resistance: Excellent performance in oxidizing atmospheres; resistant to platinum evaporation
- Mechanical Strength: Maintains ductility at high temperatures, suitable for harsh industrial environments
Technical Specifications
| Attribute | Value |
|---|---|
| Wire Diameter | 0.5mm, 0.8mm, 1.0mm (tolerance: -0.02mm) |
| Thermoelectric Power (1000°C) | 0.643 mV (vs 0°C reference) |
| Thermoelectric Power (1800°C) | 13.820 mV (vs 0°C reference) |
| Long-Term Operating Temperature | 1600°C |
| Short-Term Operating Temperature | 1800°C (≤10 hours) |
| Tensile Strength (20°C) | ≥150 MPa |
| Elongation | ≥20% |
| Electrical Resistivity (20°C) | Positive leg: 0.31 Ω·mm²/m; Negative leg: 0.19 Ω·mm²/m |
Chemical Composition (Typical, %)
| Conductor | Main Elements | Trace Elements (max, %) |
|---|---|---|
| Positive Leg (Platinum-Rhodium 30) | Pt:70, Rh:30 | Ir:0.02, Ru:0.01, Fe:0.003, Cu:0.001 |
| Negative Leg (Platinum-Rhodium 6) | Pt:94, Rh:6 | Ir:0.02, Ru:0.01, Fe:0.003, Cu:0.001 |
Product Specifications
| Item | Specification |
|---|---|
| Length per Spool | 5m, 10m, 20m (due to high precious metal content) |
| Surface Finish | Annealed, bright (no surface contamination) |
| Packaging | Vacuum-sealed in argon-filled titanium containers to prevent oxidation |
| Calibration | Traceable to international temperature standards with certified EMF curves |
| Custom Options | Precision cutting, surface polishing for high-purity applications |
Typical Applications
- High-temperature sintering furnaces (ceramic and refractory materials)
- Metal smelting (superalloy and special steel production)
- Glass manufacturing (float glass forming furnaces)
- Aerospace propulsion testing (rocket engine nozzles)
- Nuclear industry (high-temperature reactor monitoring)
We provide Type B thermocouple assemblies with ceramic protection tubes and high-temperature connectors. Due to the high material value, sample lengths are limited to 0.5-1m upon request, accompanied by full material certificates and impurity analysis reports. Custom configurations for specific furnace environments are available
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