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Non-Insulated Single Conductor Thermocouple Wire
Non-Insulated Thermocouple wire is available in all ASTM thermocouple types, including R, S, B and C type wire from stock. Standard and Special accuracies available as are calibrations upon request.
- Non-Insulated Single Conductor Thermocouple Type
- Thermocouple Limits of Error and Published Range For Bare Wire
- Thermocouple Sheath Material Temperature Limits
- Thermocouple Temperature Limits By Sheath Diameter
- Base Metal TC Wire
- Comparison of Wire Gauges
- High Temperature Thermocouple Wire Information
- Accuracy of JMS Thermocouple Wire
- Thermocouple Type Material & Color Code
- Thermocouple Extension Grade Wire General Information
- Thermocouple Grade Wire General Information
| Thermocouple Type | Material | Magnetic | ASTM Color Coding | IEC Color Coding |
|---|---|---|---|---|
| J |
Iron
Constantan |
Yes
No |
White
Red |
White
Black |
| T |
Copper
Constantan |
No
No |
Blue
Red |
White
Brown |
| K |
Chromel
Alumel |
No
No |
Yellow
Red |
White
Green |
| E | Chromel/Constantan |
No
No |
Purple
Red |
White
Violet |
| P | Platinel | N/A | N/A | N/A |
| S |
Platinum 10% Rhodium
Pure Platinum |
No
No |
Black
Red |
White
Orange |
| R |
Platinum 13% Rhodium
Pure Platinum |
No
No |
Black
Red |
white
Orange |
| B |
Platinum 30% Rhodium
Platinum 6% Rhodium |
No
No |
Grey
Red |
White
Grey |
| N | Nicrosil/Nisil |
No
Slightly |
Orange
Red |
White
Pink |
| C | Tungsten 5% Rhenium/ Tungsten 26% Rhenium |
No
No |
White
Red |
N/A |
| ANSI Thermocouple Type | Temp Range (°C) | Temp Range (°F) | Standard Limits of Error (°C)* | Special Limits of Error (°C) |
|---|---|---|---|---|
| J | 0 to 760 | 32 to 1400 | The greater of ±2.2 or ±0.75% | The greater of ±2.2 or ±0.75% |
| T | 0 to 370 | 32 to 700 | The greater of ±1 or ±0.75% | The greater of ±0.5 or ±0.4% |
| K | 0 to 1260 | 32 to 2300 | The greater of ±2.2 or ±0.75% | The greater of ±1.1 or ±0.4% |
| E | 0 to 870 | 32 to 1600 | The greater of ±1.7 or ±0.5% | The greater of ±1 or ±0.4% |
| S | 0 to 1480 | 32 to 2700 | The greater of ±1.5 or ±0.25% | The greater of ±0.6 or ±0.1% |
| R | 0 to 1480 | 32 to 2700 | The greater of ±1.5 or ±0.25% | The greater of ±0.6 or ±0.1% |
| N | 0 to 1246 | 32 to 2300 | The greater of ±2.2 or ±0.75% | The greater of ±1.1 or ±0.4% |
| B | 870 to 1700 | 1600 to 3100 | ±0.5% | ±0.25% |
| TA | -200 to 0 | -328 to 32 | The greater of ±1 or ±1.5% | B |
| EA | -200 to 0 | -328 to 32 | The greater of ±1.7 or ±1% | B |
| KA | -200 to 0 | -328 to 32 | The greater of ±2.2 or ±2% | B |
A: Thermocouple and thermocouple materials are normally supplied to meet the tolerances specified in the table of temperatures above 0°C. The same materials, however, may not fall within the tolerances given for temperatures below 0°C in the normal section in the table. If materials are required to meet the tolerances stated for temperatures below 0°C the purchase order must specifically state that requirement. Selection of materials will usually be required.
B: Special tolerances for temperatures below 0°C are difficult to justify due to limited available information.
*: Standard and special limits of error in °F are 1.8 times larger thant the °C tolerance at the equivalent °C temperature.
| Material Symbol |
Sheath Material |
Melting Point(°F) |
Max Temp; In Air(°F) |
Atmosphere* |
|---|---|---|---|---|
| H | 304 SS | 2550 | 1650 | ORNV |
| J | 310 SS | 2550 | 2100 | ORNV |
| L | 316L SS | 2550 | 1650 | ORNV |
| O | 446 SS | 2700 | 2100 | ORNV |
| M | Inconel 600 | 2500 | 2100 | ONV |
| P | Inconel 702 | 2620 | 1500 | ONV |
| Q | Platinum | 3216 | 3000 | ON |
| R | Molybdenum | 4750 | 1000 | VNR |
| T | Titanium | 3300 | 600 | V |
| V | STABALOY | 2552 | 2220 | ORNV |
*KEY
O=Oxidizing, R=Reducing, N=Neutral, V=Vacuum
| Suggested Upper Limit for Outside Diameter (Single Element) °C (°F) | ||||||
|---|---|---|---|---|---|---|
| Sheath | Thermocouple Type | |||||
| In | mm | T | J | E | K | N |
| 1/25" | 1.0 | 260° (500°) | 260° (500°) | 300° (570°) | 700° (1290°) | 2700° (1290°) |
| 1/16" | 1.6 | 260° (500°) | 440° (825°) | 510° (950°) | 920° (1690°) | 920° (1690°) |
| 1/8" | 3.2 | 315° (600°) | 520° (970°) | 650° (1200°) | 1070° (1950°) | 1070° (1950°) |
| 3/16" | 4.8 | 370° (700°) | 620° (1150°) | 730° (1350°) | 1150° (2100°) | 1150° (2100°) |
| 1/4" | 6.3 | 370° (700°) | 720° (1330°) | 820° (1510°) | 1150° (2100°) | 1150° (2100°) |
| 3/8" | 9.5 | 370° (700°) | 720° (1330°) | 820° (1510°) | 1150° (2100°) | 1150° (2100°) |
BASE METAL THERMOCOUPLE WIRE FT. / LB
| ANSI CODE | WIRE TYPE | ELEMENT POLARITY | AWG | WIRE FT. / LB |
|---|---|---|---|---|
| JP | Iron | JP Iron Positive (+) 8 | 8 14 20 24 28 30 |
22.8 91.2 365.0 925.0 2353.0 3767.0 |
| JN | Constantan | Negative (- | 8 14 20 24 28 30 |
20.2 80.9 324.0 821.0 2089.0 3316.0 |
| KP | Chrome | Positive (+) | 8 14 20 24 28 30 |
21 83 331 838 2089 3316 |
| KN | Alumel | Negative (-) | 8 14 20 24 28 30 |
21 83 331 838 2130 3370 |
| EP | ||||
| EN | Chromel | Positive (+) | 20 24 30 |
328 833 3364 |
| TP | Copper | Positive (+) | 20 24 30 |
324 820 3294 |
| TN | Constantan | Negative (-) | 20 24 30 |
324 821 3316 |
COMPARISON OF WIRE GAUGES
Standard Wire Gauges in Approximate Decimals of an Inch and mm.
| American or Brown and Sharp Wire Gauge | Diameter Inches | Diameter Millimeters | British Standard or Imperial | US Standard |
|---|---|---|---|---|
| 1 | 0.2893 | 7.348 | .300 | .281 |
| 2 | 0.2576 | 6.544 | .276 | .266 |
| 3 | 0.2294 | 5.827 | .252 | .250 |
| 4 | 0.2043 | 5.189 | .232 | .234 |
| 5 | 0.1819 | 4.621 | .212 | .219 |
| 6 | 0.1620 | 4.115 | .192 | .203 |
| 7 | 0.1443 | 3.665 | .176 | .188 |
| 8 | 0.1285 | 3.264 | .160 | .172 |
| 9 | 0.1144 | 2.906 | .144 | .156 |
| 10 | 0.1019 | 2.588 | .128 | .141 |
| 11 | 0.0907 | 2.304 | .116 | .125 |
| 12 | 0.0808 | 2.053 | .104 | .109 |
| 13 | 0.0720 | 1.829 | .092 | .0938 |
| 14 | 0.0641 | 1.628 | .080 | .0781 |
| 15 | 0.0571 | 1.450 | .072 | .0703 |
| 16 | 0.0508 | 1.291 | .064 | .0625 |
| 17 | 0.0453 | 1.150 | .056 | .0563 |
| 18 | 0.0403 | 1.024 | .048 | .0500 |
| 19 | 0.0359 | 0.9116 | .040 | .0438 |
| 20 | 0.0320 | 0.8118 | .036 | .0375 |
| 21 | 0.0285 | 0.7230 | .032 | .0344 |
| 22 | 0.0253 | 0.6438 | .028 | .031 |
| 23 | 0.0226 | 0.5733 | .024 | .0281 |
| 24 | 0.0201 | 0.5106 | .022 | .0250 |
| 25 | 0.0179 | 0.4547 | .020 | .0219 |
| 26 | 0.0159 | 0.4049 | .018 | .0188 |
| 27 | 0.0142 | 0.3606 | .0164 | .0172 |
| 28 | 0.0126 | 0.3211 | .0148 | .0156 |
| 29 | 0.0113 | 0.2859 | .0136 | .0141 |
| 30 | 0.0100 | 0.2546 | .0124 | .0125 |
| 31 | 0.0089 | 0.2268 | .0116 | .0109 |
| 32 | 0.0080 | 0.2019 | .0108 | .0102 |
| 33 | 0.00708 | 0.178 | .010 | .0094 |
| 34 | 0.00630 | 0.152 | .0092 | .0086 |
| 35 | 0.00561 | 0.138 | .0084 | .0078 |
| 36 | 0.00500 | 0.127 | .0076 | .0066 |
| 37 | 0.00445 | 0.1131 | .0068 | .0070 |
| 38 | 0.00397 | 0.1007 | .006 | .0063 |
| 39 | 0.00353 | 0.08969 | .0052 | -- |
| 40 | 0.00314 | 0.07987 | .0048 | -- |
HIGH TEMPERATURE THERMOCOUPLE WIRE
| ANSI CODE | CODE TYPE | ELEMENT POLARITY | AWG | WIRE IN / T. OZ |
|---|---|---|---|---|
| SP | Pt-10% Rh | Positive (+) | 16 20 24 26 28 |
46.4 118.0 302.2 480.0 715.2 |
| SN | ||||
| RP | Pt | Negative (-) | 16 20 24 26 28 |
43.3 110.0 281.6 432.0 666.6 |
| RN | Pt | Negative (-) | 16 20 24 26 28 |
43.3 110.0 281.6 432.0 666.6 |
| BP | Pt-30% Rh | Positive (+) | 16 20 24 28 |
52.7 134.0 343.1 812.3 |
| BN | Pt-6% Rh | Negative (-) | 16 20 24 28 |
45.2 114.8 394.0 695.8 |
| CP | Tungsten 5% Rhenium | Positive (+) | 24 | 308.7 |
| CN | Tungsten 26% Rhenium | Negative (-) | <24> | 304.3 |
Pt = Platinum
Rh = Rhodium
ACCURACY OF JMS THERMOCOUPLE WIRE
JMS insulated and bare thermocouple wire is matched to meet standard or special limits of error for temperatures above 32°F (0°C), as given in ANSI MC 96.1 and shown in tables below
LIMITS OF ERROR FOR THERMOCOUPLE WIRE
| THERMOCOUPLE TYPE | °F | |||||
|---|---|---|---|---|---|---|
| WIRE ALLOY | ANSI TYPE SYMBOL | TEMPERATURE RANGE °F | STANDARD LIMITS | ORDER CODE | SPECIAL LIMITS | ORDER CODE |
| Iron (+) vs. Constantan (-) | J | +32° to +545° +545° to +1400° |
±4° ±.75% |
J | ±2° ±.4% |
JJ |
| Chromel™ (+) vs. Alumel ™ (-) | K | 330° to -165° -165° to +32° +32° to +545° +545° to +2300° |
±2% ±4° ±4° ±.75% |
K | ±2° ±.4% |
KK |
| Copper (+) vs. Constantan™ (- | T | -330° to -85° -85° to +270° +270° to +660° |
±1.5% ±1.8° ±.75% |
T | ±.8% ±.9° ±.4% |
TT |
| Chromel™ (+) vs. Constantan™ (-) | E | -330° to -270° -270° to +480° +480° to +640° +640° to +1600° |
±1% ±3° ±3° ±5% |
E | ±1.8° ±1.8° ±.4% ±.4% |
EE |
| Nicrosil™ (+) vs. Nisil™ (-) | N | +32° to +545° +545° to +2300° |
±4° ±.75% |
N | ±2° ±.4% |
NN |
| THERMOCOUPLE TYPE | °C | |||||
|---|---|---|---|---|---|---|
| WIRE ALLOY | ANSI TYPE SYMBOL | TEMPERATURE RANGE °C | STANDARD LIMITS | ORDER CODE | SPECIAL LIMITS | ORDER CODE |
| Iron (+) vs. Constantan (-) | J | 0° to +285° +285° to +750 |
±2.2° ±.75% |
J | ±1.1° ±.4% |
JJ |
| Chromel™ (+) vs. Alumel ™ (-) | K | -200° to -110° -110° to 0° 0° to +285° +285° to +1250 |
±2% ±2.2° ±2.2° ±.75% |
K | ±1.1° ±.4% |
KK |
| Copper (+) vs. Constantan™ (-) | T | -200° to -65° -65° to +130° +130° to +350° |
±1.5% ±1° ±.75% |
T | ±.8% ±.5° ±.4% |
TT |
| Chromel™ (+) vs. Constantan™ (-) | E | -200° to -170° -170° to +250° +250° to +340° +340° to +900° |
±1% ±1.7° ±1.7° ±5% |
E | ±1° ±1° ±.4% ±.4% |
EE |
| Nicrosil™ (+) vs. Nisil™ (-) | N | 0° to +285° +285° to +1250° |
±2.2° ±.75% |
N | ±1.1° ±.4% |
NN |
| Thermocouple Type | Material | Magnetic | ASTM Color Coding | IEC Color Coding |
| J | Iron Constantan | Yes No |
White Red |
White Black |
| T | Copper Constantan | No No |
Blue Red |
White Brown |
| K | Chromel Alumel | No No |
Yellow Red |
White Green |
| E | Chromel/Constantan | No No |
Purple Red |
White Violet |
| P | Platinel | N/A | N/A | N/A |
| S | Platinum 10% Rhodium Pure Platinum | No No |
Black Red |
White Orange |
| R | Platinum 13% Rhodium Pure Platinum | No No |
Black Red |
white Orange |
| B | Platinum 30% Rhodium Platinum 6% Rhodium | No No |
Grey Red |
White Grey |
| N | Nicrosil/Nisil | No Slightly |
Orange Red |
White Pink |
| C | Tungsten 5% Rhenium/ Tungsten 26% Rhenium | No No |
White Red |
N/A |
| ANSI: TYPE, J - Iron / Constantan | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| PP161JX | 16 | Solid | .137 | Polyvinyl Chloride | Polyvinyl Chloride | .111 x .188” | 27 lbs. |
| PA161JX | 16 | Solid | .137 | PVC/Alum. Mylar Shield (Twisted) | PVC | .222” | 28 lbs. |
| PA201JX | 20 | Solid | .357 | PVC/Alum. Mylar Shield (Twisted) | PVC | .184” | 20 lbs. |
| PP201JX | 20 | Solid | .357 | Polyvinyl Chloride | Polyvinyl Chloride | .095 x .158” | 14 lbs. |
| PP202JX | 20 | Stranded | .317 | Polyvinyl Chloride | Polyvinyl Chloride | .115 x .190” | 14 lbs. |
| PX201JX | 20 | Solid | .357 | (FEP) Extruded Teflon | Extruded Teflon | .072 x .124” | 11 lbs. |
| ANSI: TYPE, K - Chromel / Alumel | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| PA161KX | 16 | Solid | .233 | PVC/Alum. Mylar Shield (Twisted) | PVC | .222” | 28 lbs. |
| PP161KX | 16 | Solid | .233 | Polyvinyl Chloride | Polyvinyl Chloride | .116 x .188” | 27 lbs. |
| PA201KX | 20 | Solid | .590 | PVC/Alum. Mylar Shield (Twisted) | PVC | .184” | 20 lbs. |
| PP201KX | 20 | Solid | .590 | Polyvinyl Chloride | Polyvinyl Chloride | .195 x .158” | 14 lbs. |
| PP202KX | 20 | Stranded | .538 | Polyvinyl Chloride | Polyvinyl Chloride | .115 x .190” | 14 lbs. |
| ANSI: TYPE, T - Copper / Constantan | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| PP141TX | 14 | Solid | .074 | Polyvinyl Chloride | Polyvinyl Chloride | .130 x .226” | 37 lbs. |
| PA161TX | 16 | Solid | .118 | PVC/Alum. Mylar Shield (Twisted) | PVC | .222” | 20 lbs |
| PP161TX | 16 | Solid | .118 | Polyvinyl Chloride | Polyvinyl Chloride | .111 x .188” | 28 lbs. |
| PA201TX | 20 | Solid | .298 | PVC/Alum. Mylar Shield | PVC | .184” | 20 lbs. |
| PP201TX | 20 | Solid | .298 | Polyvinyl Chloride | Polyvinyl Chloride | .095 x .158” | 15 lbs. |
| ANSI: TYPE, E - Chromel / Constantan | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| PA161EX | 16 | Solid | .278 | PVC/Alum. Mylar Shield (Twisted) | PVC | .222” | 20 lbs. |
| PP201EX | 20 | Solid | .704 | Polyvinyl Chloride | Polyvinyl Chloride | .095 x .158” | 15 lbs. |
| ANSI: TYPE, S and R - Platinum / Rhodium | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| PP161SX | 16 | Solid | .016 | Polyvinyl Chloride | Polyvinyl Chloride | .116 x .250” | 27 lbs. |
| GG201SX | 20 | Solid | .040 | Glass Braid | Glass Braid | .059 x .105” | 8 lbs. |
| PP201SX | 20 | Solid | .040 | Polyvinyl Chloride | Polyvinyl Chloride | .095 x .158 | 14 lbs. |
*ohms per double foot at 20°C (68°F).
| ANSI: TYPE, J - Iron / Constantan | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| GG210J | 20 | Solid | .357 | Glass Braid | Glass Braid | .059 x .105” | 8 lbs. |
| GG202J | 20 | Stranded | .317 | Double Glass Braid | Glass Braid | .075 x .137” | 9lbs. |
| KK201J | 20 | Solid | .357 | Fused Kapton Tape | None, Twisted | .087” | 10 lbs. |
| NN201J | 20 | Solid | .357 | Nylon | Nylon | .068 x .120” | 11 lbs. |
| TF201J | 20 | Solid | .357 | (TFE) tape, Teflon | (TFE) tape, Teflon | .065 x .110” | 10 lbs. |
| TX201J | 20 | Solid | .357 | Extruded (FEP) Teflon | Extruded (FEP) Teflon | .072 x .124” | 11 lbs. |
| GG241J | 24 | Solid | .877 | Glass Braid | Glass Braid | .047 x .081” | 4 lbs. |
| KK241J | 24 | Solid | .877 | Fused Kapton Tape | None, Twisted | .063” | 5 lbs. |
| PP241J | 24 | Solid | .877 | Polyvinyl Chloride | None, Rip-Cord | .048 x .096” | 4 lbs. |
| TF241J | 24 | Solid | .877 | (TFE) tape, Teflon | (TFE) tape, Teflon | .047 x .078” | 5 lbs. |
| GG261J | 26 | Solid | 1.394 | Glass Wrap | Glass Braid | .040 x .065” | 3 lbs. |
| GG281J | 28 | Solid | 2.216 | Glass Wrap | Glass Braid | .037 x .059” | 3 lbs. |
| GG301J | 30 | Solid | 3.520 | Glass Wrap (Braid avail.) | Glass Braid | .033 x .053” | 3 lbs. |
| ANSI: TYPE, K - Chromel / Alumel | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| GG201K | 20 | Solid | .590 | Glass Braid | Glass Braid | .059 x .105” | 8 lbs. |
| GG202K | 20 | Stranded | .538 | Double Glass Braid | Glass Braid | .075 x .137” | 9 lbs. |
| KK201K | 20 | Solid | .590 | Fused Kapton Tape | None, Twisted | .087” | 10 lbs. |
| RR201K | 20 | Solid | .590 | Vitreous Silica Braid | Vitreous Silica Braid | .102 x .174” | 16 lbs. |
| TF201K | 20 | Solid | .590 | (TFE) tape, Teflon | (TFE) tape, Teflon | .065 x .110” | 10 lbs. |
| TX201K | 20 | Solid | .590 | Teflon Extruded (FEP) | Teflon Extruded | .072 x .124” | 11 lbs. |
| GG241K | 24 | Solid | 1.490 | Glass Braid (Wrap avail.) | Glass Braid | .047 x .081” | 4 lbs. |
| PP241K | 24 | Solid | 1.490 | Polyvinyl-Rip Cord Const. | None | .048 x .096” | 4 lbs. |
| GG261K | 26 | Solid | 2.370 | Glass Wrap | Glass Braid | .040 x .065” | 3 lbs. |
| GG281K | 28 | Solid | 3.770 | Glass Braid (Wrap avail.) | Glass Braid | .039 x .064” | 3 lbs. |
| GG301K | 30 | Solid | 5.980 | Glass Wrap | Glass Braid | .033 x .053” | 2 lbs. |
| ANSI: TYPE, T - Copper / Constantan | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| GG201T | 20 | Solid | .298 | Glass Braid (Wrap avail.) | Glass Braid | .059 x .105” | 5 lbs |
| TF201T | 20 | Solid | .298 | (TFE) tape, Teflon | (TFE) tape, Teflon | .065 x .110” | 10 lbs. |
| TX201T | |||||||
| GG241T | 20 | Solid | .298 | Extruded Teflon (FEP) | Extruded Teflon | .072 x .124” | 11 lbs. |
| NN241T | |||||||
| PP241T | 24 | Solid | .753 | Nylon | Nylon | .060 x .095” | 6 lbs. |
| TF241T | 24 | Solid | .753 | (TFE) tape, Teflon | (TFE) tape, Teflon | .047 x .078” | 5 lbs. |
| GG281T | 28 | Solid | 1.905 | Glass Braid (Wrap avail.) | Glass Braid | .039 x .064” | 3 lbs. |
| GG301T | 30 | Solid | 3.025 | Glass Wrap | Glass Braid | .033 x .053” | 2 lbs. |
| ANSI: TYPE, E - Chromel / Constantan | |||||||
|---|---|---|---|---|---|---|---|
| Catalog Number | Guage Size | Conductors | *Ohms | Primary Insulation | Outer Jacket | Min-Max. O.D. | Est. Shpg. Wt. per M |
| GG201E | 20 | Solid | .704 | Glass Braid | Glass Braid | .059 x .105” | 8 lbs. |
| GG241E | 24 | Solid | 1.780 | Glass Braid | Glass Braid | .047 x .081” | 4 lbs. |
*ohms per double foot at 20°C (68°F).
Resources
JMS Southeast, Inc.