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 ±2.2 or ±0.75% ±2.2 or ±0.75%
T 0 to 370 32 to 700 ±1 or ±0.75% ±0.5 or ±0.4%
K 0 to 1260 32 to 2300 ±2.2 or ±0.75% ±1.1 or ±0.4%
E 0 to 870 32 to 1600 ±1.7 or ±0.5% ±1 or ±0.4%
S 0 to 1480 32 to 2700 ±1.5 or ±0.25% ±0.6 or ±0.1%
R 0 to 1480 32 to 2700 ±1.5 or ±0.25% ±0.6 or ±0.1%
N 0 to 1246 32 to 2300 ±2.2 or ±0.75% ±1.1 or ±0.4%
B 870 to 1700 1600 to 3100 ±0.5% ±0.25%
TA -200 to 0 -328 to 32 ±1 or ±1.5% B
EA -200 to 0 -328 t0 32 ±1.7 or ±1% B
KA -200 to 0 -328 tp 32 ±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 state so. 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/td> 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 INFORMATION

JMS offers thermocouples and wire in the following types. Listed below are suggested criteria to consider in selecting the desired type for your application. Contact JMS Southeast if additional information is required.

(J)–Iron vs Constantan (Most Common)
May be used in vacuum, oxidizing, reducing, and inert atmospheres. Heavier gauge wire is recommended for long term life above 1000°F since the iron element oxidizes rapidly at these temperatures.

(T)–Copper vs Constantan (Most Common Cold)
May be used in vacuum, oxidizing, reducing, and inert atmospheres. It is resistant to corrosion in most atmospheres. High stability at sub-zero temperatures and its limits of error are guaranteed at cryogenic temperatures.

(K)–Chromel vs Alumel (Most Common Real Hot)
Recommended for continuous use in oxidizing or inert atmospheres up to 2300°F (1260°C), especially above 1000°F. Cycling above and below 1800°F (1000°C), is not recommended due to EMF alteration from hysteresis effects. Should not be used in sulfurous or alternating reducing and oxidizing atmospheres unless protected with protection tubes. Fairly reliable and accurate at high temperatures.

(E)–Chromel vs Constantan
May be used in oxidizing or inert atmospheres, but not recommended for alternating oxidizing or inert atmospheres. Not subject to corrosion under most atmospheric conditions. Has the highest EMF produced per degree than any other standard thermocouple and must be protected from sulfurous atmospheres.

(S,R)–Platinum vs Platinum Rhodium (Most Common Real, Real Hot)
Recommended for use in oxidizing or inert atmospheres. Reducing atmospheres may cause excessive grain growth and drifts in calibration.

(N)–Nicrosil vs Nisil (New ... Better Than “K”)
May be used in oxidizing, dry reducing, or inert atmospheres. Must be protected in sulfurous atmospheres. Very reliable and accurate at high temperatures. Can replace Type K thermocouples in many application.

(C)–Tungsten 5% Rhenium vs Tungsten 26% Rhenium
Recommended for use in vacuum, high purity hydrogen, or pure inert atmospheres. May be used at very high temperatures (2316°C), however, is inherently brittle.


Thermocouple Type Information

ANSI T/C TYPE NAMES CONDUCTOR IDENTIFICATION ASTM COLOR CODING MAGNETIC IEC COLOR CODING
J Iron
Constantan
+
-
white
red
yes
no
white
black
T Copper
Constantan
+
-
blue
red
no
no
white
brown
K Chromel
Alumel
+
-
yellow
red
no
yes
white
green
E Chromel
Constantan
+
-
purple
red
no
no
white
violet
P
(Not ANSI)
Platinel N/A N/A N/A N/A
S Platinum 10% Rhodium
Pure platinum
+
-
black
red
no
no
white
orange
R Platinum 13% Rhodium
Pure platinum
+
-
black
red
no
no
white
orange
B Platinum 30% Rhodium
Platinum 6% Rhodium
+
-
grey
red
no
no
white
grey
N Nicrosil
Nisil
+
-
orange
red
no
slightly
white
pink
C
(Not ANSI)
Tungsten 5% Rhenium
Tungsten 26% Rhenium
+
-
white
red
no
no
N/A

ANSI T/C TYPE TEMP. RANGE LIMITS OF ERROR
(°C) (°F) STANDARD SPECIAL
(°C) (°F) (°C) (°F)
J 0 to 760 32 to 1400 ±2.2 or ±0.75% See Note ±1.1 or 0.4% See Note
T 0 to 370 32 to 700 ±1 or ±0.75% ±0.5 or 0.4%
K 0 to 1260 32 to 2300 ±2.2 or ±0.75% ±1.1 or ±0.4%
E 0 to 870 32 to 1600 ±1.7 or ±0.5% ±1 or ±0.4%
S 0 to 1480 32 to 2700 ±1.5 or ±0.25% ±0.6 or ±0.1%
R 0 to 1480 32 to 2700 ±1.5 or ±0.25% ±0.6 or ±0.1%
N 0 to 1246 32 to 2300 ±2.2 or ±0.75% ±1.1 or ±0.4%
B 870 to 1700 1600 to 3100 ±0.5% ±0.25%
TA -200 to 0 -328 to 32 ±1 or ±1.5% B
EA -200 to 0 -328 to 32 ±1.7 or ±1% B
KA -200 to 0 -328 to 32 ±2.2 or ±2 B

A Thermocouple and thermocouple materials are normally supplied to meet the tolerances specified in the table for temperatures above 0°C. The same materials, however, may not fall within the tolerances given for temperatures below 0°C in the section section of the table. If materials are required to meet the tolerances stated for temperatures below 0°C the purchase order must so state. Selection of materials usually will be required.

B Special tolerances for temperatures below 0°C are difficult to justify due to limited available information.

Note: The °F tolerance is 1.8 times larger than the °C tolerance at the equivalent °C temperature.

THERMOCOUPLE EXTENSION GRADE WIRE

Catalog Number Guage Size Conductors *Ohms Primary Insulation Outer Jacket Min.-Max. O.D. Est. Shpg. Wt. per M

ANSI: TYPE, J - Iron / Constantan

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

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

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 (Twisted)

PVC

.184”

20 lbs.

PP201TX

20

Solid

.298

Polyvinyl Chloride

Polyvinyl Chloride

.095 x .158”

15 lbs.

ANSI: TYPE, E - Chromel / Constantan

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

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).