N

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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:

  1. Heating - Gas burners for ovens
  2. Cooling - Freezers
  3. Engine protection - Temperatures and surface temperatures
  4. High temperature control - Iron casting