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Temperature Sensors
Thermocouple Wire Specifications |
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Insulation Characteristics |
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American
Wire
Gauge
(AWG) |
Size
DIA.
(Inches) |
7/0 |
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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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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 |
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Fair |
Fair |
900°F (482°C) |
HTG |
Ceramic Braid, HighTemperature |
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Poor |
Poor |
2200°F (1205°C) |
KK |
Kapton (fused tape) |
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Excellent |
Excellent |
500°F (260°C) |
NN |
Nylon |
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Excellent |
Excellent |
350°F (176°C) |
PM |
Polyvinyl Chloride (PVC) |
Mylar Drain Line
|
Good |
Excellent |
221°F (105°C) |
PV |
Polyvinyl Chloride (PVC) |
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Good |
Excellent |
221°F (105°C) |
TF |
Teflon, TFE (fused tape) |
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Very Good |
Excellent |
500°F (260°C) |
TT |
Teflon, FEP |
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Very Good |
Excellent |
400°F (204°C) |
VS |
Vitreous Silica Fibre |
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Poor |
Poor |
1400°F (760°C) |
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Upper Temperature Limits for Thermocouple Wire Gauge |
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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. |
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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 |
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1480°C
(2700°F) |
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Patinum-13% Rhodium |
R |
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1480°C
(2700°F) |
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Platinum-30% vs 6% Rhodium |
B |
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1700°C
(3100°F) |
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Tungsten-26% Rhenium |
WR† |
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2300°C
(4200°F) |
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Tungsten-3% vs. 25% Rhenium |
W3† |
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2300°C
(4200°F) |
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Tungsten-5% vs. 26% Rhenium |
W5† |
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2300°C
(4200°F) |
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*Magnetic
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™Trademark Hoskins Mfg. Co. |
†Not ANSI symbol |
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Nominal Thermocouple Resistance Ohms Double Foot @ 68°F (20°C) |
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Wire Ga
B & S
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Wire Size
DIA. |
ANSI Types |
J |
K |
T |
E |
S |
R |
B |
6 |
.162 |
.014 |
.023 |
.012 |
.027 |
.007 |
.007 |
.008 |
*7 |
.144 |
.021 |
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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 |
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