American Limits of Error ASTM E230-ANSI MC 96.1
|Temperature Range||Tolerances-Reference Junction 0°C (32°F)|
|Thermocouple Type||°C||°F||Standard Limit of Error||Special Limit of Error|
|°C (Whichever is greater)||°F||°C (Whichever is greater)||°F|
|T||0 to 370||32 to 700||+/-1 or +/-0.75%||²||+/-0.5 or +/-0.4%||²|
|J||0 to 760||32 to 1400||+/-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%||–|
|K or N||0 to 1260||32 to 2300||+/-2.2 or +/-0.75%||–||+/-1.1 or +/-0.4%||–|
|R or S||0 to 1480||32 to 2700||+/-1.5 or +/-0.25%||–||+/-0.6 or +/-0.1%||–|
|B||870 to 1700||1600 to 3100||+/-0.5%||–||+/-0.25%||–|
¹Tolerances in this table apply to new essentially homogeneous thermocouple wire, normally in the size range 0.25 to 33 mm in diameter (30 to 8 AWG) and used at temperatures not exceeding the recommended limits of upper temperature limits for protected thermocouples. If used at higher temperatures these tolerances may not apply.
²At a given temperature that is expressed in °C, the tolerance expressed in °F is 1.8 times larger than the tolerance expressed in °C. Note that wherever applicable, percentage-based tolerances must be computed from temperatures that are expressed in °C.
³Material is normally selected to meet tolerances above 0°C. If thermocouples are required to meet tolerances below 0°C, a special material selection step is usually required.