ABOUT
Thermocouple Alloys
Thermocouples alloys are classified into different types based on the combination of metals or alloys used to construct them. Common thermocouple types include Type K (Nickel-Chromium/Nickel-Aluminum), Type J (Iron/Constantan), and Type T (Copper/Constantan), among others. Each type has a specific temperature range and application suitability, with the choice of alloys dictated by factors such as temperature stability, corrosion resistance, and durability.
About Thermocouple Conductor
| Type | Conductor (*) Chemical Composition % | Conductor (-) Chemical Composition % | Temp range | American Standard ASTM E230/ANSI MC95.2 | European Standard IEC 584 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ni | Cr | Fe | Cu | Others | Cu | Ni | Others | T/c Range | Class 1 (0.4%) | Class 2 (0.75%) | T/c Range | Class 1 (0.4%) | Class 2 (0.75%) | ||
| K | 90 | 10 | – | – | – | – | 94 | Mn+ Si+ Others | -200°C to +1260°C | 0 to 1260°C | ±2.2°C | ±1.1°C | 0°C to 1260°C | ±1.5°C | ±2.5°C |
| N | 84.4 | 14.2 | – | – | Si 1.4 | – | 95.6 | Si4.4 | -200°C to +1260°C | 0°C to 1260°C | ±2.2°C | ±1.1°C | 0°C to 1260°C | ±1.5°C | ±2.5°C |
| J | – | – | 100 | – | – | Bal | 44 | Mn+ | -40°C to +760°C | 0°C to 760°C | ±2.2°C | ±1.1°C | 0°C to 760°C | ±1.5°C | ±2.5°C |
| T | – | – | – | 100 | – | Bal | 44 | Mn+ | -200°C to +370°C | 0°C to 370°C | ±1°C | ±0.5°C | 0°C to 370°C | ±0.5°C | ±1°C |
| E | 90 | 10 | – | – | – | Bal | 44 | Mn+ | -200°C to +870°C | 0°C to 870°C | ±1.7°C | ±1.1°C | 0°C to 870°C | ±1.5°C | ±2.5°C |
In the realm of thermocouples
| Thermocouple Type | Material + & – | Temp range | Application |
|---|---|---|---|
| E | Chromel & Constantan (Ni-Cr & Cu-Ni) | -200 to 900°C | Inert media, Oxidizing media |
| J | Iron & Constantan (Fe & Cu-Ni) | 0 to 750°C | Inert media, Oxidizing media, Reducing media Vacuum |
| K | Chromel & Alumel (Ni-Cr & Ni-Al) | -200 to 1250°C | Inert media, Oxidizing media |
| N | Nicrosil & Nisil (Ni-Cr & Ni-Si) | -270 to 1300°C | Inert media, Oxidizing media |
| T | Copper & Constantan (Cu & Cu-Ni) | -200 to 350°C | Inert media, Oxidizing media, Reducing media Vacuum |
| Type of thermocouple | Diameter | |||||
|---|---|---|---|---|---|---|
| 3.25 mm | 1.63 mm | 0.81 mm | 0.51 mm | 0.33 mm | 0.25 mm | |
| K | 1260°C | 1090°C | 980°C | 870°C | 870°C | 760°C |
| N | 760°C | 590°C | 480°C | 370°C | 370°C | 320°C |
| J | 1260°C | 1090°C | 980°C | 870°C | 870°C | 760°C |
| T | 350°C | 350°C | 260°C | 200°C | 200°C | 150°C |
| E | 870°C | 650°C | 540°C | 430°C | 430°C | 370°C |
Key Properties
- Excellent Mechanical Properties
- Optimized corrosion resistance
- Excellent themo-electrical properties
- High creep resistance
- Wide Temperature Operating Range
- Long-Term Stability
Available form – Wire, Rod and Bar in oxidized, acid wash and luster surface
Available Diameters – 8.0 mm to 0.16 mm
Quality check and Analysis – Each spool and Coils has been pass through all properties testing in Tempsens Instrument private limited, Udaipur – NABL accredited lab. Test certificates has been provided.
