MATERIAL SPECIFICATIONS
Sheath Materials |
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|---|---|---|---|---|---|---|
| Sheath Type | ARi Symbol | Maximum Temp (°C) | Melting Temp (°C) | Allowable Environment | Standard Sheath Diameter (inches) | Minimum Bend Radius |
| Inconel 600 | B | 1175 | 1345 | Inert, Vacuum, Oxidizing | 0.040, 0.062, 0.125, 0.188, 0.250 | 5X Sheath Diameter |
| Platinum 10% Rhodium | AH | 1550 | 1850 | Inert, Oxidizing | 0.040, 0.062, 0.125 | 5X Sheath Diameter |
| Tantalum | N | 2200 | 2995 | Inert, Vacuum | 0.040, 0.062, 0.125 | 10X Sheath Diameter |
| Niobium 1% Zirconium | AV | 2200 | 2495 | Inert, Vacuum | 0.062, 0.125 | 10X Sheath Diameter |
| Molybdenum | O | 2000 | 2620 | Inert, Vacuum, Reducing | 0.062, 0.125, 0.188, 0.250 | Do Not Bend |
| Coated Molybdenum | OCR | 1600 | 2000 | Inert, Oxidizing | 0.125, 0.250 | Do Not Bend |
Wire Types |
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|---|---|---|---|---|
| Thermocouple Combinations | Calibration Type | ARi Symbol | Standard Limits Of Error | Recommended Temperature Range |
| Platinum 30% Rhodium (+) Vs. Platinum 6% Rhodium (-) | B | B | ± 0.5% | 870 – 1700 °C |
| Tungsten 5% Rhenium (+) Vs. Tungsten 26% Rhenium (-) | C | AE | ± 4.4 °C (0 – 426 °C)* | 0 – 2200 °C |
| ± 1% (426 – 2315 °C)* | ||||
| Tungsten 3% Rhenium (+) Vs. Tungsten 25% Rhenium (-) | D | AO | ± 4.4 °C (0 – 426 °C)* | 0 – 2200 °C |
| ± 1% (426 – 2315 °C)* | ||||
| Platinum 13% Rhodium (+) Vs. Platinum | R | R | ± 1.5 °C or 0.25% ** | 0 – 1450 °C |
| Platinum 10% Rhodium (+) Vs. Platinum | S | S | ± 1.5 °C or 0.25% ** | 0 – 1450 °C |
*Per ASTM E-988
**Per ASTM E-230
Insulation Materials |
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|---|---|---|---|---|
| Insulation Type | ARi Symbol | Maximum Operating Temp (°C) | Approximate Melting Temp (°C) | Comments |
| Magnesia (MgO) | N | 1700 | 2800 | Very hydroscopic. Used mostly in compacted sheaths. |
| Alumina Oxide (Al²O³) | A | 1550 | 2040 | Excellent with Platinum alloys. |
| Hafnium Oxide (HfO²) | H | 2200 | 2790 | Comparable to Beryllium Oxide and safe to handle. |
| Beryllium Oxide (BeO)*** | B | 2200 | 2650 | Excellent High Temperature thermal conductivity and resistivity. |
***Beryllium is considered a toxic material and can cause health problems if particles are inhaled.