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Themocouples - Reference Guide

✔ 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

*Oxidizing, Vacuum or Inert atmosphere only

Thermocouple



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

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 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)


Twisted Shielded Wire Bend Easily



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