 | Properties of the sheath material
|
| | Diameter and construction of thermocouple assembly
|
Temperature Range
OMEGACLADŽ is a three-part system composed
of compacted MgO insulation, thermocouple wire
and metal sheath. Four factors determine the useful
service temperature for OMEGACLADŽ 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 |
*Oxidizing, Vacuum or Inert atmosphere only
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 |
AWG = American Wire Gage
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 OMEGACLADŽ 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) |
|
