Thermocouple Alloys Type J White 0.2mm Thermocouple Wire for Thermocouple Extension Alloy Wires
Thermocouple Alloys Type J White 0.2mm Thermocouple Wire for Thermocouple Extension Alloy Wires
Thermocouple wire allows temperatures to be measured electronically. A typical thermocouple construction consists of a pair of dissimilar metals that are electrically joined together at the sensing point and connected to a voltage measuring instrument at the other end. When one junction is hotter than the other, a thermal “electromotive” force (in millivolts) is produced that is roughly proportional to the difference in temperature between the hot and cold junctions.
Platinum-rhodium thermocouple wire
Non-insulated fine diameter, single wire and pair wire, ultra-high temperature resistant
Types S, R and B
R-type and S-type temperature range 1398 ~ 1482°C (2550 ~ 2700°F)
Type B is suitable for continuous use at temperatures up to 1704°C (3100°F)
To effectively prevent oxidation and corrosion at high temperatures, DLX offers high-quality uninsulated thermometer wires that can be applied to 3 types of "precious metal" thermocouples:
Type S: Platinum (-) and Platinum 10% Rhodium (+)
Type R: Platinum (-) and Platinum 13% Rhodium (+)
Type B: Platinum 6% Rhodium (-) and Platinum 30% Rhodium (+)
Types R and S are recommended for continuous use in oxidizing or inert atmospheres at temperatures up to 1398°C (2550°F), or short-term exposure to high temperatures up to 1482°C (2700°F). Type B is suitable for continuous use in oxidizing or inert atmospheres up to 1704°C (3100°F). When working close to the maximum temperature, it is recommended to use a larger wire diameter.
All 3 types of thermocouples can be used in a vacuum environment for short periods of time. Type B provides the best stability when applied in a vacuum environment. All 3 models are not suitable for use in reducing gases or environments containing metallic or non-metallic vapors unless a non-metallic protective sleeve is used. Never insert thermocouples directly into metal protective sleeves.
Wire diameters range from 0.025 to 0.812 mm (0.001 to 0.032"). If desired, thermocouple wires can be supplied in pairs that meet or exceed standard error limits. Special error limit wires are available on request and must be paired order.
| Material | melting point | Resistivity |
| Pure Rhodium(99.99%) | 1963 | 12.44 |
| Pure Platinum(99.99%) | 1772 | 21.45 |
| Pt-Rh6% | 1830 | 20.7 |
| Pt-Rh10% | 1860 | 19.8 |
| Pt-Rh20% | 1905 | 18.8 |
| Pt-Rh30% | 1927 | 17.6 |
| Specification: 0.015~41.2(mm) in round wire, strip: 60.1~0.5(mm) | ||
| Application: Gas sensor. All kinds of sensors, medical components. Electric level and heating probe, etc. | ||
2. Aluminum industry
3. Food and Pharmaceutical
4. Forgings
5. Glass, Ceramics, Clay Tiles, Bricks
6. Heat Treating
7. Petroleum, Downhole Oil & Gas
8. Sensor Manufacturing
9. Steel industry
10. Utilities Power Generation
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Thermocouple type and index |
Measurement Range ℃ |
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Type |
Index |
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B | 600~1700 |
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R | 0~1600 |
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S | 0~1600 |
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K | -200~1300 |
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E | -200~900 |
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J | -40~750 |
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T | -200~350 |
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N | -200~1300 |
The allowable grade and Tolerance are obtained at 0℃
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Thermocouple |
Grade |
Temperature range |
Allowable Tolerance /℃ |
| Type B | Ⅱ | 600~1700 | ±0.25% t |
| Ⅲ | 600~800 | ±4 | |
| 800~1700 | ±0.5%t | ||
| Type R(S) | Ⅰ | 0~1100 | ±1 |
| 1100~1600 | ±[1+(t－1100) ×0.3％] | ||
| Ⅱ | 0~600 | ±1.5 | |
| 600~1600 | ±0.25% t | ||
| Type K and Type N | Ⅰ | -40~1100 | ±1.5℃ or ±0.4%t |
| Ⅱ | -40~1300 | ±2.5℃ or ±0.75%t | |
| Ⅲ | -200~40 | ±2.5℃ or ±1.5%t | |
| Type E | Ⅰ | -40~1100 | ±1.5℃ or ±0.4%t |
| Ⅱ | -40~1300 | ±2.5℃ or ±0.75%t | |
| Ⅲ | -200~40 | ±2.5℃ or ±1.5%t | |
| Type J | Ⅰ | -40~750 | ±1.5℃ or ±0.4%t |
| Ⅱ | -40~750 | ±2.5℃ or ±0.75%t | |
| Type T | Ⅰ | -40~350 | ±0.5℃ or ±0.4%t |
| Ⅱ | -40~350 | ±1.0℃ or ±0.75%t | |
| Ⅲ | -200~40 | ±1.0℃ or ±1.5%t |
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