N
The Type N thermocouple is composed of a nickel-14% chromium-1 1/2% silicon (+) wire versus a nickel 4 1/2% silicon-1/10% magnesium (-) wire. The Type N thermocouple is the newest addition to the ISA family. It was developed to be used under the same conditions as a Type K. Type N should be used in oxidizing or inert atmospheres with a service temperature range between -200°C and 1260°C (-330°F to 2300°F). The addition of silicon and chromium makes this type of thermocouple more resistant to Green-Rot and less drifting when compared to a Type K. The negative element, or NN, of a Type N thermocouple can be described by any of the following names: Nisil, nickel-silicon, or, HAI-NN1. The positive element, or NP, of a Type N thermocouple can be described by any of the following names: Nicrosil, nickel-chromium-silicon, or HAI-NP1.
Detailed Parameter of thermocouple wire
Working Temperature Range
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:
- Heating - Gas burners for ovens
- Cooling - Freezers
- Engine protection - Temperatures and surface temperatures
- High temperature control - Iron casting