NiCr-NiSi (Type K) thermocouple finds the widest use in all basemetal thermocouple, at temperature above 500 °C.
Type K thermocouple has strong resistance to oxidation than other base metal thermocouples. It has high EMF against Platinum 67, excellent temperature accuracy, sensitivity and stability, with a low cost. It is recommended for oxidizing or inert atmospheres, but cannot be used directly in the following cases:
| Chemical Composition | |||||
|
Conductor Name |
Polarity |
Code |
Nominal Chemical Composition /% |
||
|
Ni |
Cr |
Si |
|||
|
Ni-Cr |
Positive |
KP |
90 |
10 |
-- |
|
Ni- Si |
Negative |
KN |
97 |
-- |
3 |
| Working Temperature | ||
|
Diameter/mm |
Long time Working temperature /ºC |
Short period Working temperature /ºC |
|
0.3 |
700 |
800 |
|
0.5 |
800 |
900 |
|
0.8,1.0 |
900 |
1000 |
|
1.2,1.6 |
1000 |
1100 |
|
2.0,2.5 |
1100 |
1200 |
| 3.2 |
1200 |
1300 |
Application of thermocouple wire:
Heating - Gas burners for ovens