Thermocouple Colour Codes

TypeTemperature range °c (continuous)Temperature range °c
(short term)
Tolerance class 1 (°c)Tolerance class 2 (°c)IEC Colour codeBS Colour codeANSI Colour CodeNotes
K0 to +1100-180 to +1300-40 to +375 ± 1.5 °c, 375 to 1000 ± 0.004*[t]°c-40 to +333 ± 2.5 °c, 333 to 1200 ± 0.0075*[t]°cThe most common sensor, wide range, good in oxidising atmosphere.
J0 to +700-180 to +800-40 to +375 ± 1.5 °c, 375 to 750 ± 0.004*[t]°c-40 to +333 ± 2.5 °c, 333 to 750 ± 0.0075*[t]°cGood in dry & reducing atmospheres.
N0 to +1100-270 to +1300-40 to +375 ± 1.5 °c, 375 to 1000 ± 0.004*[t]°c-40 to +333 ± 2.5°c, 333 to 1200 ± 0.0075*[t]°cFairly new to market. High stability.
R0 to +1600-50 to +17000 to +1100 ± 1.0°c, 1100 to 1600 ± (1+0.003 (t-1100))*[t]°c0 to +600 ± 1.5 °c, 600 to 1600 ± 0.0025*[t]°cHigh temperatures. Used in UK. Usually in ceramic sheath.
S0 to +1600-50 to +17500 to +1100 ± 1.0 °c, 1100 to 1600 ± (1+0.003(t-1100))*[t]°c0 to +600 ± 1.5°c, 600 to 1600 ± 0.0025*[t]°cHigh temperatures. Usually in ceramic sheath.
B+200 to +17000 to +1820Not Available600 to 1700 ± 0.0025*[t]°cNo standard use copper wireNo standard use copper wireNo standard use copper wireVery high temperatures. Always protected by high purity ceramic.
T-185 to +300

-250 to +400
-40 to +125 ± 0.5°c, 125 to 350 ± 0.004*[t]°c-40 to +133 ± 1.0°c,133 to 350 ± 0.0075*[t]°cCryogenic sensor. Copes with water present.
E
0 to +800
-40 to +900-40 to + 375 ± 1.5°c, 375 to 800 ± 0.004*[t]°c-40 to +333 ± 2.5°c, 333 to 900 ± 0.0075*[t]°cHigh EMF output.

Notes
Maximum temperature depends on actual application conditions and sensor design. Tolerances are sourced from BS EN 60584-1:2013 Thermocouple EMF & Tolerances.