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Thermocouple and Extension Wire Calibration Tolerances

 
Calibration Type
Temperature Range
Tolerances (whichever is Greater)
Thermocouple - Grade Wire
°F
°C
Standard
Special
J
32 to 1382°F
0 to 750°C
±2.2°C or ±0.75%
±1.1°C or ±0.4%
K
32 to 2282°F
0 to 1250°C
±2.2°C or ±0.75%
±1.1°C or ±0.4%
E
32 to 1652°F
0 to 900°C
±1.7°C or ±0.5%
±1.0°C or ±0.4%
T
32 to 662°F
0 to 350°C
±1.0°C or ±0.75%
±0.5°C or ±0.4%
R or S
32 to 2642°F
0 to 1450°C
±1.5°C or ±0.25%
±0.6°C or ±0.4%
B
1598 to 3092°F
870 to 1700°C
±0.5°C
 
N
32 to 2282°F
0 to 1250°C
±2.2°C or ±0.75%
±1.1°C or ±0.4%
Extension - Grade Wire 
JX
32 to 392°F
0 to 200°C
±2.2°C
±1.1°C
KX
32 to 392°F
0 to 200°C
±2.2°C
±1.1°C
EX
32 to 392°F
0 to 200°C
±1.7°C
±1.0°C
TX
32 to 212°F
0 to 100°C
±1.0°C
±0.5°C
NX
32 to 392°F
0 to 200°C
±2.2°C
±1.1°C
Compensation Extension Wire  
BX
32 to 392°F
0 to 200°C
±3.7°C
CX
32 to 1600°F
0 to 870°C
±6.8°C
RX or SX
32 to 392°F
0 to 200°C
±5.0°C
 

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