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Thermocouple corrections
These calibrations for type D thermocouple wire were
supplied by the manufacturers. They allow correction for the deviation
of a given
batch of thermocouple wire from the standard.
Type D wires are composed of 97%W/3%Re (+) and 75%W/25%Re (-). |
Batch 4
Batch 3
Batch 2
Batch 1
0.005" Batch 1
EMF function
|
| |
Temperature |
Batch Corrected Setpoint |
With 12° Offset |
|
| |
500 |
|
500 |
|
488
|
|
|
| |
600 |
|
600 |
|
588 |
|
|
| |
700 |
|
700 |
|
688 |
|
|
| |
800 |
|
798 |
|
786 |
|
|
| |
900 |
|
897 |
|
885 |
|
|
| |
1000 |
|
996 |
|
984 |
|
|
| |
1100 |
|
1095 |
|
1083 |
|
|
| |
1200 |
|
1195 |
|
1183 |
|
|
| |
1300 |
|
1295 |
|
1283
|
|
|
| |
1400 |
|
1395 |
|
1383 |
|
|
| |
1500 |
|
1495 |
|
1483 |
|
|
| |
1600 |
|
1596 |
|
1584 |
|
|
| |
1700 |
|
1696 |
|
1684 |
|
|
| |
1800 |
|
1795 |
|
1783 |
|
|
|
| |
Temperature |
Batch Corrected Setpoint |
With 12° Offset |
|
| |
500 |
|
505 |
|
493 |
|
|
| |
600 |
|
605 |
|
593 |
|
|
| |
700 |
|
705 |
|
693 |
|
|
| |
800 |
|
804 |
|
792 |
|
|
| |
900 |
|
902 |
|
890 |
|
|
| |
1000 |
|
1001 |
|
989 |
|
|
| |
1100 |
|
1101 |
|
1089 |
|
|
| |
1200 |
|
1201 |
|
1189 |
|
|
| |
1300 |
|
1301 |
|
1289 |
|
|
| |
1400 |
|
1401 |
|
1389 |
|
|
| |
1500 |
|
1501 |
|
1489 |
|
|
| |
1600 |
|
1602 |
|
1590 |
|
|
| |
1700 |
|
1703 |
|
1691 |
|
|
| |
1800 |
|
1807 |
|
1795 |
|
|
|
| |
Temperature |
Batch Corrected Setpoint |
With 12° Offset |
|
| |
500 |
|
504 |
|
491 |
|
|
| |
600 |
|
605 |
|
592 |
|
|
| |
700 |
|
706 |
|
693 |
|
|
| |
800 |
|
806 |
|
794 |
|
|
| |
900 |
|
906 |
|
893 |
|
|
| |
1000 |
|
1007 |
|
995 |
|
|
| |
1100 |
|
1109 |
|
1096 |
|
|
| |
1200 |
|
1209 |
|
1196 |
|
|
| |
1300 |
|
1309 |
|
1296 |
|
|
| |
1400 |
|
1407 |
|
1394 |
|
|
| |
1500 |
|
1508 |
|
1496 |
|
|
| |
1600 |
|
1610 |
|
1598 |
|
|
| |
1700 |
|
1716 |
|
1703 |
|
|
| |
1800 |
|
1818 |
|
1805 |
|
|
|
| |
Temperature |
Batch Corrected Setpoint |
With 12° Offset |
|
| |
500 |
|
504 |
|
492 |
|
|
| |
600 |
|
603 |
|
591 |
|
|
| |
700 |
|
702 |
|
690 |
|
|
| |
800 |
|
801 |
|
789 |
|
|
| |
900 |
|
899 |
|
887 |
|
|
| |
1000 |
|
997 |
|
985 |
|
|
| |
1100 |
|
1096 |
|
1084 |
|
|
| |
1200 |
|
1195 |
|
1183 |
|
|
| |
1300 |
|
1294 |
|
1282 |
|
|
| |
1400 |
|
1392 |
|
1380 |
|
|
| |
1500 |
|
1490 |
|
1478 |
|
|
| |
1600 |
|
1589 |
|
1577 |
|
|
| |
1700 |
|
1686 |
|
1674 |
|
|
| |
1800 |
|
1785 |
|
1773 |
|
|
|
| |
Temperature |
Batch Corrected Setpoint |
|
|
| |
500 |
|
499 |
|
|
|
|
| |
600 |
|
599 |
|
|
|
|
| |
700 |
|
699 |
|
|
|
|
| |
800 |
|
799 |
|
|
|
|
| |
900 |
|
898 |
|
|
|
|
| |
1000 |
|
997 |
|
|
|
|
| |
1100 |
|
1097 |
|
|
|
|
| |
1200 |
|
1197 |
|
|
|
|
| |
1300 |
|
1298 |
|
|
|
|
| |
1400 |
|
1399 |
|
|
|
|
| |
1500 |
|
1499 |
|
|
|
|
| |
1600 |
|
1600 |
|
|
|
|
| |
1700 |
|
1699 |
|
|
|
|
| |
1800 |
|
1798 |
|
|
|
|
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Function
The EMF generated by a type D thermocouple as a function of temperature
(T, in °C) is given by:
EMF = aT +bT^2 + cT^3 + dT^4 + eT^5
where the coefficients a, b, ... are given by:
| |
T < 783 °C |
T >= 783 °C |
| a |
9.5685256e-3 |
9.9109462e-3 |
| b |
2.0592621e-5 |
1.8666488e-5 |
| c |
-1.8464573e-8 |
-1.4935266e-8 |
| d |
7.9498033e-12 |
5.3743821e-12 |
| e |
-1.4240735e-15 |
-7.9026726e-16 |
(and yes, you DO need all those significant figures!)
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