Thermocouples
Thermocouple types and selection guide
ModelsK · J · T · E · N · R · S · B
A thermocouple is a closed circuit of two dissimilar conductors: a temperature difference between the junctions produces a thermoelectric EMF (Seebeck effect). An RTD relies on the change of a conductor's resistance with temperature. Sheath material: SUS304, SUS316, NCF600; flange or thread mounting.
- First choose the type to match the instrument, the process temperature and the mounting method
- Sheathed thermocouples can be bent — minimum bend radius is 3–5× the sheath diameter
- Do not bend within 10 sheath diameters of the measuring tip
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The price depends on the order configuration and is given in the technical and commercial offer.
Specifications
| Type | Positive electrode | Negative electrode | Measuring range | Short-term | Application |
|---|---|---|---|---|---|
| K | Nickel-chromium | Nickel-silicon | −200…1000°C | 1200°C | Linear characteristic, the most widely used in industry |
| J | Iron | Constantan | 0…600°C | 750°C | Medium temperature range; sensitivity second only to type E |
| T | Copper | Constantan | −200…300°C | 350°C | For low temperatures and precise measurements |
| E | Nickel-chromium | Constantan | −200…700°C | 800°C | Medium and low temperatures, highest thermo-EMF |
| N | Nickel-chromium-silicon | Nickel-silicon | −200…1200°C | 1250°C | Wide range, stable thermo-EMF |
| R | Platinum-rhodium 13% | Platinum | 0…1400°C | 1600°C | High temperature, inert and oxidising atmospheres, high accuracy |
| S | Platinum-rhodium 10% | Platinum | 0…1400°C | 1600°C | High accuracy; often used as a reference standard |
| B | Platinum-rhodium 30% | Platinum-rhodium 6% | 0…1500°C | 1700°C | Highest temperature tolerance, accurate measurement |
Specifications are for information only and are confirmed for each specific order.
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