Type K thermocouple EMF reference table
The complete Type K EMF table from −200 °C to +1370 °C at a 0 °C reference junction, ready to read on screen or export to CSV for your own calculations.
17 verified reference points between -200 °C and 1370 °C. Values are millivolts at a 0 °C reference junction for a standardised Type K pair. Points are spaced at 100 °C, with the negative tail closed at −200 °C and the top closed at 1370 °C.
| Temperature (°C) | EMF (mV) | Sensitivity at point (µV/°C) |
|---|---|---|
| -200 | -5.891 | - |
| -100 | -3.554 | 23.4 |
| 0 | 0.000 | 35.5 |
| 100 | 4.096 | 41.0 |
| 200 | 8.138 | 40.4 |
| 300 | 12.209 | 40.7 |
| 400 | 16.397 | 41.9 |
| 500 | 20.644 | 42.5 |
| 600 | 24.905 | 42.6 |
| 700 | 29.129 | 42.2 |
| 800 | 33.275 | 41.5 |
| 900 | 37.326 | 40.5 |
| 1000 | 41.276 | 39.5 |
| 1100 | 45.119 | 38.4 |
| 1200 | 48.838 | 37.2 |
| 1300 | 52.410 | 35.7 |
| 1370 | 54.819 | 34.4 |
The sensitivity column is the average slope across the interval ending at that point, shown to make the curvature of Type K visible: it is highest at low temperature and falls away toward the top of the range.
Reading the table in practice
- Check the reference first. A millivolt figure is meaningless without saying what the cold junction was doing. If your instrument is not compensated to 0 °C, correct for that before comparing.
- Watch the green-rot window. Between 800 °C and 1050 °C in low-oxygen or reducing service, the Chromel leg oxidises selectively and the reading drifts. Type N is the usual answer in that band.
- Hold the installation to the certificate. The table is the nominal curve; the spool certificate is what your loop actually has to meet.
Frequently Asked Questions (FAQ)
What reference junction is this Type K table based on?
0 °C. Every millivolt figure is the EMF of a standardised Type K pair with the reference junction held at the ice point, which is the convention IEC 60584-1 and ASTM E230 publish against. A reading taken with a different cold-junction temperature is not directly comparable without correction.
Why does the table stop at 1370 °C?
Because that is the top of the verified span for the insulation and construction we supply against. Short-term use above it shortens the life of the Chromel leg sharply, and the green-rot window between 800 °C and 1050 °C in low-oxygen service has to be designed around rather than extrapolated through.
Can I download the table for my own spreadsheet?
Yes, the Export CSV button writes the whole table to a file in your browser. Nothing is uploaded, and the file can be dropped straight into a calibration sheet or a scaling calculation.
Do the values include wire tolerance?
No. They are the nominal standardised curve, not your spool's measured output. Two Type K spools both inside Class 1 tolerance can still differ from each other, which is why a batch EMF certificate is the figure to hold a real installation against.
Want the certificate behind the curve?
We ship Type K bare and stranded wire with a furnace-batch-traceable EMF certificate to IEC 60584-1 / ASTM E230.