Temperature Sensors

Thermocouple Wire Specifications

Insulation Characteristics

Insulation
Code
Wire
Insulation
Type
Shield Abrasion
Resistance
Moisture
Resistance
Insulation
Temperature
Rating
GG Fiberglass Braid   Fair Fair 900°F (482°C)
GW Fiberglass Wrap   Fair Fair 900°F (482°C)
HTG Ceramic Braid, HighTemperature   Poor Poor 2200°F (1205°C)
KK Kapton (fused tape)   Excellent Excellent 500°F (260°C)
NN Nylon   Excellent Excellent 350°F (176°C)
PM Polyvinyl Chloride (PVC) Mylar Drain Line Good Excellent 221°F (105°C)
PV Polyvinyl Chloride (PVC)   Good Excellent 221°F (105°C)
TF Teflon, TFE (fused tape)   Very Good Excellent 500°F (260°C)
TT Teflon, FEP   Very Good Excellent 400°F (204°C)
VS Vitreous Silica Fibre   Poor Poor 1400°F (760°C)

Upper Temperature Limits for Thermocouple Wire Gauge

Temperature limits for standard thermocouples that are protected with a closed-end protection tube are shown. These limits are suggested for continuous temperature sensing where thermal limitation of the insulation is not a factor. For unprotected thermocouples these limits should be reduced for equivalent service life.

Thermocouple
Wire Type
ANSI
Type
Symbol
Wire Gauge (AWG)
8 ga. 14 ga. 20 ga. 24 ga. 30 ga.
Copper - Constantan T   370°C
(700°F)
260°C
(500°F)
200°C
(400°F)
150°C
(300°F)
*Iron - Constantan J 760°C
(1400°F)
600°C
(1100°F)
500°C
(900°F)
370°C
(700°F)
320°C
(600°F)
Chromel™ - Constantan E 870°C
(1600°F)
650°C
(1200°F)
550°C
(1000°F)
430°C
(800°F)
430°C
(800°F)
Chromel™ - *Alumel™ K 370°C
(700°F)
1100°C
(2000°F)
1000°C
(1800°F)
870°C
(1600°F)
760°C
(1400°F)
Nicrosil - Nisil N 1260°C
(2300°F)
1100°C
(2000°F)
1000°C
(1800°F)
870°C
(1600°F)
760°C
(1400°F)
Platinum-10% Rhodium S       1480°C
(2700°F)
 
Patinum-13% Rhodium R       1480°C
(2700°F)
 
Platinum-30% vs 6% Rhodium B       1700°C
(3100°F)
 
Tungsten-26% Rhenium WR†       2300°C
(4200°F)
 
Tungsten-3% vs. 25% Rhenium W3†       2300°C
(4200°F)
 
Tungsten-5% vs. 26% Rhenium W5†       2300°C
(4200°F)
 
*Magnetic ™Trademark Hoskins Mfg. Co. †Not ANSI symbol

Nominal Thermocouple Resistance Ohms Double Foot @ 68°F (20°C)

Wire Ga
B & S
Wire Size
DIA.
ANSI Types
J K T E S R B
6 .162 .014 .023 .012 .027 .007 .007 .008
*7 .144 .021            
8 .128 .022 .036 .019 .044 .010 .010 .013
14 .064 .089 .147 .074 .176 .044 .044 .054
16 .050 .141 .232 .117 .277 .069 .069 .086
18 .040 .229 .377 .190 .450 .112 .113 .139
20 .032 .357 .588 .297 .702 .175 .178 .218
24 .020 .905 1.488 .745 1.778 .449 .453 .550
26 .015 1.441 2.45 1.20 2.84 .701 .708 .875
28 .012 2.297 3.59 1.92 4.33 1.062 1.073 1.392
30 .010 3.65 6.02 2.94 7.19 1.794 1.813 2.213
36 .005 14.66 24.08 12.22 28.80 7.150 7.226 8.897
American
Wire
Gauge
(AWG)
Size
DIA.
(Inches)
7/0  
6/0 0.5800
5/0 0.5165
4/0 0.4600
3/0 0.4096
2/0 0.3648
1/0 0.3249
1 0.2893
2 0.2576
3 0.2294
4 0.2043
5 0.1819
6 0.1620
7 0.1443
8 0.1285
9 0.1144
10 0.1019
11 0.0907
12 0.0808
13 0.0720
14 0.0641
15 0.0571
16 0.0508
17 0.0453
18 0.0403
19 0.0359
20 0.0320
21 0.0285
22 0.0253
23 0.0226
24 0.0201
25 0.0179
26 0.0159
27 0.0142
28 0.0126
29 0.0113
30 0.0100
31 0.00893
32 0.00795
33 0.00708
34 0.00630
35 0.00561
36 0.0500
37 0.00445
38 0.00396
39 0.00353
40 0.00314
41 0.00280
42 0.00249
43 0.00222
44 0.00198
45 0.00176
46 0.00157
47 0.00140
48 0.00124
49 0.00111
50 0.00099
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