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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 |
|
| 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 |
|
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 |
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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) |
|
| 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
|
™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
|
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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