- Properties of the sheath material
- Diameter and construction of thermocouple assembly
Temperature Range
OMEGACLAD® is a three-part system composed of compacted MgO insulation, thermocouple wire and metal sheath. Four factors determine the useful service temperature for OMEGACLAD® assemblies.
- Range for the thermocouple wire (see table of error)
- Maximum service temperature of insulation. In the case of MgO, this is in excess of 1650°C (3000°F)
Sheath Material Specifications
| Material | Melting Point (°C/°F) |
Continuous Maximum Temp. (°C/°F) |
Tensile (PSI) Strength | |
| @93°C (200°F) | @ 537°C (1000°F) | |||
| 304 SS | 1405/2560 | 900/1650 | 68,000 | 15,000 |
| 310 SS | 1405/2560 | 1150/2100 | 75,000 | 27,500 |
| 316 SS | 1370/2500 | 925/1700 | 75,000 | 23,000 |
| 321 SS | 1400/2550 | 870/1600 | 70,000 | 17,000 |
| Hastelloy X | 1260/2300 | 1200/2200 | 55,100 | 35,500 |
| Inconel* | 1400/2550 | 1150/2100 | 39,000 | 5,000 |
| SUPER XL | 1400/2550 | 1204/2200 | 70,000 | 17,000 |
Upper Temperature Limit in °C (°F) of Protected Bare Wire Thermocouples Vs. Wire Diameter
| T/C Type |
Wire Size | ||||||
| 8 AWG 0.128" |
14 AWG 0.064" |
20 AWG 0.032" |
24 AWG 0.020" |
28 AWG 0.013" |
30 AWG 0.010" |
36 AWG 0.005" |
|
| J | 760 (1400) | 590 (1100) | 480 (900) | 370 (700) | 370 (700) | 320 (600) | 315 (590) |
| K | 1260 (2300) | 1090 (2000) | 980 (1800) | 870 (1600) | 870 (1600) | 760 (1400) | 590 (1100) |
| E | 870 (1600) | 650 (1200) | 540 (1000) | 430 (800) | 430 (800) | 370 (700) | 320 (600) |
| T | 370 (700) | 370 (700) | 260 (500) | 200 (400) | 200 (400) | 150 (300) | |
| RS/SX | 200 (400) | 200 (400) | 200 (400) | 200 (400) | 200 (400) | 150 (300) | |
| N | 1260 (2300) | 1090 (2000) | 980 (1800) | 980 (1800) | 980 (1800) | 870 (1600) | |
| CX | 472 (800) | 472 (800) | 472 (800) | 472 (800) | 472 (800) | 400 (752) | |
Common Thermocouple Junctions
Conductor Size Equivalents
| Gage No. |
AWG | SWG | Gage No. |
AWG | SWG | ||||
| inches | mm | inches | mm | inches | mm | inches | mm | ||
| 0 | 0.3249 | 8.25 | 0.324 | 8.23 | 23 | 0.0226 | 0.574 | 0.0240 | 0.610 |
| 1 | 0.2893 | 7.35 | 0.300 | 7.62 | 24 | 0.0201 | 0.511 | 0.0220 | 0.559 | 2 | 0.2576 | 6.54 | 0.276 | 7.01 | 25 | 0.0179 | 0.455 | 0.0200 | 0.508 |
| 3 | 0.2294 | 5.83 | 0.252 | 6.40 | 26 | 0.0159 | 0.404 | 0.0180 | 0.457 |
| 4 | 0.2043 | 5.19 | 0.232 | 5.89 | 27 | 0.0142 | 0.361 | 0.0164 | 0.417 |
| 5 | 0.1819 | 4.62 | 0.212 | 5.38 | 28 | 0.0126 | 0.320 | 0.0148 | 0.376 |
| 6 | 0.1620 | 4.11 | 0.192 | 4.88 | 29 | 0.0113 | 0.287 | 0.0136 | 0.345 |
| 7 | 0.1443 | 3.67 | 0.176 | 4.47 | 30 | 0.0100 | 0.254 | 0.0124 | 0.315 |
| 8 | 0.1285 | 3.26 | 0.160 | 4.06 | 31 | 0.0089 | 0.226 | 0.0116 | 0.295 |
| 9 | 0.1144 | 2.91 | 0.144 | 3.66 | 32 | 0.0080 | 0.203 | 0.0108 | 0.274 |
| 10 | 0.1019 | 2.59 | 0.128 | 3.25 | 33 | 0.0071 | 0.180 | 0.0100 | 0.254 |
| 11 | 0.0907 | 2.30 | 0.116 | 2.95 | 34 | 0.0063 | 0.160 | 0.0092 | 0.234 |
| 12 | 0.0808 | 2.05 | 0.104 | 2.64 | 35 | 0.0056 | 0.142 | 0.0084 | 0.213 |
| 13 | 0.0720 | 1.83 | 0.092 | 2.34 | 36 | 0.0050 | 0.127 | 0.0076 | 0.193 |
| 14 | 0.0641 | 1.63 | 0.080 | 2.03 | 37 | 0.0045 | 0.114 | 0.0068 | 0.173 |
| 15 | 0.0571 | 1.45 | 0.072 | 1.83 | 38 | 0.0040 | 0.102 | 0.0060 | 0.152 |
| 16 | 0.0508 | 1.29 | 0.064 | 1.63 | 39 | 0.0035 | 0.089 | 0.0052 | 0.132 |
| 17 | 0.0453 | 1.15 | 0.056 | 1.42 | 40 | 0.0031 | 0.079 | 0.0048 | 0.122 |
| 18 | 0.0403 | 1.02 | 0.048 | 1.22 | 41 | 0.0028 | 0.071 | 0.0044 | 0.112 |
| 19 | 0.0359 | 0.912 | 0.040 | 1.02 | 42 | 0.0025 | 0.064 | 0.0040 | 0.102 |
| 20 | 0.0320 | 0.813 | 0.036 | 0.914 | 43 | 0.0022 | 0.056 | 0.0036 | 0.091 |
| 21 | 0.0285 | 0.724 | 0.032 | 0.813 | 44 | 0.0020 | 0.051 | 0.0032 | 0.081 |
| 22 | 0.0253 | 0.643 | 0.028 | 0.711 | 45 | 0.0018 | 0.046 | 0.0028 | 0.071 |
SWG = (British) Standard Wire Gage
To convert from AWG to SWG: Determine wire diameter in inches (mm) from appropriate AWG.
To convert 30 AWG to SWG, determine that 30 AWG is 0.0100", which is equivalent to 33 SWG
Upper Temperature Limit in °C (°F) of OMEGACLAD® Vs. Sheath Diameter
| T/C | Sheath Dia. | |||||||
| 0.020" 0.5 mm |
0.032" 0.8 mm |
0.040" 1.0 mm |
0.062" 1.6 mm |
0.093" 2.4 mm |
0.125" 3.2 mm |
0.188" 4.8 mm |
0.250" 6.3 mm |
|
| J | 260 (500) | 260 (500) | 260 (500) | 440 (825) | 480 (900) | 520 (970) | 620 (1150) | 720 (1300) |
| K & N | 700 (1290) | 700 (1290) | 700 (1290) | 920 (1690) | 1000 (1830) | 1070 (1960) | 1150 (2100) | 1150 (2100) |
| E | 300 (570) | 300 (570) | 300 (570) | 510 (950) | 580 (1075) | 650 (1200) | 730 (1350) | 820 (1510) |
| T | 260 (500) | 260 (500) | 260 (500) | 260 (500) | 260 (500) | 315 (600) | 370 (700) | 370 (700) |
Common Thermocouple Junctions
Product Info
What is a Calibrator and why is it an important device? Introduction to Instrument Calibration
Technical Learning
