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| | | General Information | | |
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| | | Application Hints The diameter of the sensor wires determines the upper most operating temperature. The larger the diameter, the higher the temperature rating. | | |
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| | | | | | | | | | | | | | Thermocouple | No. 8 | | No. 20 | No. 24 | No. 28 | | | | Type | Gauge | | Gauge | Gauge | Gauge | | | | | °C (°F) | °C (°F) | °C (°F) | °C (°F) | °C (°F) | | | | B | | | | 3100 (1700) | | | | | E | 870 (1600) | 650(1200) | 540 (1000) | 430 (800) | 430 (800) | | | | J | 760 (1400) | 590(1100) | 480 (900) | 370 (700) | 370 (700) | | | | K and N | 1260 (2300) | 1090(2000) | 980 (1800) | 870 (1600) | 870 (1600) | | | | R and S | | | | 2700 (1480) | | | | | T | | 370 (700) | 260 (500) | 200 (400) | 200 (400) | | | | | | | | | | | | | |
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| | | a This table gives the recommended upper temperature limits for the various thermocouples and wire sizes. These limits apply to protected thermocouples, that is, thermocouples in conventional closed-end protecting tubes. They do not apply to sheathed thermocouples having compacted mineral oxide insulation. b The temperature limits given here are intended only as a guide to the user and should not be taken as absolute values nor as guarantees of satisfactory life or performance. These types and sizes are sometimes used at temperatures above the given limits, but usually at the expense of stability or life or both. In other instances, it may be necessary to reduce the above limits in order to achieve adequate service. ASTM MNL-12 (Manual on the Use of Thermocouples in Temperature measurement, ASTM MNL-12, 1993) and other literature sources should be consulted for additional application information. | | |
| | | Choose alloy 600 over 304 SS or 316 SS when higher temperatures are expected. The environment is another critical factor when determining the best material. Consult the manual on The Use of Thermocouples in Temperature Measurement, published by ASTM for further details. | | |
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| | | Mineral Insulated Sensors by Diameter and Sheath | | |
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| | | | | | | | | | | | | Sheath | | | Maximum Recommended | | | | Diameter | | | Operating Temperature | | | | in. | Calibration | Material | °C | (°F) | | | | 0.032 | K | 304 SS/Alloy 600 | 871 | (1600) | | | | 0.032 | J | 304 SS | 816 | (1500) | | | | 0.040 | K | 304 SS/316 SS/Alloy 600 | 871 | (1600) | | | | 0.040 | J | 304 SS | 816 | (1500) | | | | 0.040 | T | 304 SS | 350 | ( 662) | | | | 0.040 | E | 304 SS | 871 | (1600) | | | | 0.063 | K or N | Alloy 600 | 1093 | (2000) | | | | 0.063 | S | Alloy 600 | 1093 | (2000) | | | | 0.063 | J | 304 SS/316 SS | 816 | (1500) | | | | 0.063 | E | 304 SS | 871 | (1600) | | | | 0.063 | K | 304 SS/316 SS | 871 | (1600) | | | | 0.063 | K | Hastelloy® X | 1204 | (2200) | | | | 0.125 | K or N | Alloy 600 | 1177 | (2150) | | | | 0.125 | T | 304 SS/316 SS/Alloy 600 | 350 | (662) | | | | 0.125 | E | Alloy 600 | 871 | (1600) | | | | 0.125 | S | Alloy 600 | 1177 | (2150) | | | | 0.125 | J | 304 SS/316 SS | 816 | (1500) | | | | 0.125 | K | 304 SS | 871 | (1600) | | | | 0.250 | K or N | Alloy 600 | 1177 | (2150) | | | | 0.250 | J | 304 SS/310 SS/316 SS | 816 | (1500) | | | | 0.250 | K | 304 SS | 871 | (1600) | | | | 0.250 | T | 304 SS | 350 | (662) | | | | 0.250 | E | 304 SS/316 SS | 871 | (1600) | | | | 0.250 | K | 310 SS | 1093 | (2000) | | | | 0.250 | K | 316 SS | 871 | (1600) | | | | 0.250 | T | 316 SS | 350 | (662) | | | | 0.250 | K | 446 SS | 1149 | (2100) | | | | | | | | | | | | |
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| | | Hastelloy* is a registered trademark of Haynes International. | | |
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