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Pt100 and Thermocouple Tables Cheat Sheet

Quick reference values for field checks: thermocouple mV at key temperatures (NIST ITS-90 reference functions, 0 °C reference junction), Pt100 resistance and tolerances.

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Pt100 and Thermocouple Tables Cheat Sheet PDF preview

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Pt100 resistance (IEC 60751)

°C	Ω
−50	80.31
0	100.00
25	109.73
50	119.40
100	138.51
150	157.33
200	175.86
250	194.10
300	212.05
400	247.09
500	280.98

Pt1000 = Pt100 values × 10.

Type K, J, T (mV)

°C	−100	25	50	100	200	300	400	500	600	800	1000	1200
K	−3.554	1.000	2.023	4.096	8.138	12.209	16.397	20.644	24.905	33.275	41.276	48.838
J	−4.633	1.277	2.585	5.269	10.779	16.327	21.848	27.393	33.102	45.494	57.953	69.553
T	−3.379	0.992	2.036	4.279	9.288	14.862	20.872

Type N, E (mV)

°C	−100	0	25	50	100	200	300	400	500	600	800	1000	1200
N	−2.407	0	0.659	1.340	2.774	5.913	9.341	12.974	16.748	20.613	28.455	36.256	43.846
E	−5.237	0	1.495	3.048	6.319	13.421	21.036	28.946	37.005	45.093	61.017	76.373

Type R, S, B (mV)

°C	100	200	400	600	800	1000	1200	1400	1600
R	0.647	1.469	3.408	5.583	7.950	10.506	13.228	16.040	18.849
S	0.646	1.441	3.259	5.239	7.345	9.587	11.951	14.373	16.777
B	0.033	0.178	0.787	1.792	3.154	4.834	6.786	8.956	11.263

Cold junction check (example K)

Measure mV at the terminals: 3.096 mV.
Terminal temperature 25 °C → add 1.000 mV.
Total 4.096 mV → 100 °C.
Add mV, never °C.

Tolerances

Sensor	Class	Tolerance
Pt100	A	± (0.15 + 0.002 \|t\|) °C
Pt100	B	± (0.3 + 0.005 \|t\|) °C
K, N	1	± 1.5 °C or 0.4 % \|t\|
J	1	± 1.5 °C or 0.4 % \|t\|
T	1	± 0.5 °C or 0.4 % \|t\|

Related Calculators and Tools

Thermocouple TableFree on instrumentationblog.in Pt100 TableFree on instrumentationblog.in Thermocouple Color CodesFree on instrumentationblog.in

Frequently Asked Questions

Are these values exact?

They are calculated from the NIST ITS-90 reference functions to three decimals with a 0 °C reference junction.

Why is type B almost zero near room temperature?

Its output is tiny below about 50 °C, so cold junction errors hardly matter.

How do I use the table with a calibrator?

Set the calibrator to the mV for the test temperature with CJC off, or use the calibrator type setting with CJC on.

Learn more on the blog

Thermocouple calibration: 7 proven steps

A practical guide on instrumentationblog.in that explains the theory behind this cheat sheet.

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