Type E thermocouple table: mV vs °C (−270 to 1000 °C)

Type E thermocouple voltage in mV from −270 to 1000 °C in 10 °C steps, from the NIST (ITS-90) reference functions with the reference junction at 0 °C.

A type E thermocouple (nickel-chromium (+) and copper-nickel, constantan (−)) produces a voltage that depends on the temperature difference between the measuring junction and the reference junction. The table follows the NIST (ITS-90) reference functions, with the reference junction at 0 °C.

Type E thermocouple, reference junction at 0 °C: −270 … 140 °C
°C	mV
−270	−9.835
−260	−9.797
−250	−9.718
−240	−9.604
−230	−9.455
−220	−9.274
−210	−9.063
−200	−8.825
−190	−8.561
−180	−8.273
−170	−7.963
−160	−7.632
−150	−7.279
−140	−6.907
−130	−6.516
−120	−6.107
−110	−5.681
−100	−5.237
−90	−4.777
−80	−4.302
−70	−3.811
−60	−3.306
−50	−2.787
−40	−2.255
−30	−1.709
−20	−1.152
−10	−0.582
0	0.000
10	0.591
20	1.192
30	1.801
40	2.420
50	3.048
60	3.685
70	4.330
80	4.985
90	5.648
100	6.319
110	6.998
120	7.685
130	8.379
140	9.081

Type E thermocouple, reference junction at 0 °C: 150 … 560 °C
°C	mV
150	9.789
160	10.503
170	11.224
180	11.951
190	12.684
200	13.421
210	14.164
220	14.912
230	15.664
240	16.420
250	17.181
260	17.945
270	18.713
280	19.484
290	20.259
300	21.036
310	21.817
320	22.600
330	23.386
340	24.174
350	24.964
360	25.757
370	26.552
380	27.348
390	28.146
400	28.946
410	29.747
420	30.550
430	31.354
440	32.159
450	32.965
460	33.772
470	34.579
480	35.387
490	36.196
500	37.005
510	37.815
520	38.624
530	39.434
540	40.243
550	41.053
560	41.862

Type E thermocouple, reference junction at 0 °C: 570 … 980 °C
°C	mV
570	42.671
580	43.479
590	44.286
600	45.093
610	45.900
620	46.705
630	47.509
640	48.313
650	49.116
660	49.917
670	50.718
680	51.517
690	52.315
700	53.112
710	53.908
720	54.703
730	55.497
740	56.289
750	57.080
760	57.870
770	58.659
780	59.446
790	60.232
800	61.017
810	61.801
820	62.583
830	63.364
840	64.144
850	64.922
860	65.698
870	66.473
880	67.246
890	68.017
900	68.787
910	69.554
920	70.319
930	71.082
940	71.844
950	72.603
960	73.360
970	74.115
980	74.869

Type E thermocouple, reference junction at 0 °C: 990 … 1000 °C
°C	mV
990	75.621
1000	76.373

What about the cold junction?

In the field the reference junction sits at the transmitter or instrument terminals, almost never at 0 °C. So the voltage measured at the terminals is not the table value: the instrument compensates the cold junction. To check a mV reading, take the terminal temperature into account.

Calculated reference values, not measurements. The thermocouple tolerance depends on its class (IEC 60584-1) and is not in the table.

Values calculated from the reference functions; they do not replace measurement or a calibration certificate.

What about the cold junction?

See also