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The table below summarizes the error limits for Premium and Standard grades, while Extension grade wire is
characterized by limits of error exceeding those in the table.
Errors up to ±4°C may be experienced when using Extension grade thermocouple wire for J and K thermocouples.
Limit of Error of thermocouple wires
The range indicated is the temperature limit for the indicated errors Cold junction at 0 °C
Tc Class 1 Class 2 Class 3
type T 0.5°C (-40 to +125°C) 1°C (-40 to 133°C) 1°C (-67 to 40°C)
0.004 . T (T >125°C) 0.0075 . T (T >133 °C) 0.015. T (T <-67°C)
T range -40 to +350°C -40 to +350°C -200 to 40°C
type E 1.5°C (-40 to 375°C) 2.5°C (-40 to 333 °C) 2.5°C (-167 to +40°C)
0.004.T (T >375°C) 0.0075.T (T >333°C) 0.015.T (T <-167°C)
T range -40 to 800°C -40 to 900°C -200°C to 40°C
type J 1.5°C (-40 to 375°C) 2.5°C (-40 to 333 °C) 2.5°C (-167 to +40°C)
0.004.T (T >375°C) 0.0075.T (T >333°C) 0.015.T (T <-167°C)
T range -40 to 750°C -40 to 750°C -----
type K e N 1.5°C (-40 to 375°C) 2.5°C (-40 to 333 °C) 2.5°C (-167 to +40°C)
0.004.T (T >375°C) 0.0075.T (T >333°C) 0.015.T (T <-167°C)
T range -40 to 1000°C -40 to 1200°C -200°C to 40°C
type R e S 1°C (0 to 1100°C) 1.5°C (-40 to 600 °C) 4°C (600 to +800°C)
1 + 0.003 (T-100) 0.0075.T (T >600°C) 0.005.T (T>800°C)
(T >1100°C)
T range 0 to 1600°C 0 to 1600°C ----
type B 1°C (0 to 1100°C) 1.5°C (-40 to 600 °C) 4°C (600 to +800°C)
1 + 0.003 (T-100) 0.0075.T (T >600°C) 0.005.T (T>800°C)
(T >1100°C)
T range ----- 600 to 1700°C 600 to 1700°C