Calculate the SCFM.
Temperature Sensors
Thermocouple Wire Specifications
Insulation Characteristics
| Insulation Code |
Wire Insulation Type |
Shield | Abrasion Resistance |
Moisture Resistance |
Insulation Temperature Rating |
|---|---|---|---|---|---|
| GG | Fiberglass Braid | Poor | Good | 950°F (510°C) | |
| HTG | Ceramic Braid, HighTemperature | Fair | Fair | 2200°F (1204°C) | |
| KK | Kapton (Polyimide fused tape) | Excellent | Excellent | 500°F (260°C) | |
| NN | Nylon | Excellent | Excellent | 250°F (121°C) | |
| PM | Polyvinyl Chloride (PVC) | Mylar, Drain Line | Very Good | Excellent | 221°F (105°C) |
| PV | Polyvinyl Chloride (PVC) | Very Good | Excellent | 221°F (105°C) | |
| TF | Teflon, TFE (fused tape) | Good | Excellent | 500°F (260°C) | |
| PFA | Teflon, Extruded PFA | Excellent | Excellent | 500°F (260°C) | |
| TT | Teflon, Extruded FEP | Excellent | Excellent | 400°F (200°C) | |
| VS | Vitreous Silica Fibre | Poor | Poor | 1800°F (982°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) |
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| 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 |
Gauge / Diameter
| 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 |
