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°)

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