K

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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:

  1. Alternatively oxidizing and reducing atmosphere.
  2. Atmosphere with sulphur gases.
  3. Long time in vacuum.
  4. Low oxidizing atmosphere such as hydrogen and carbon monoxide atmosphere.

Detailed Parameter

Chemical Composition

Conductor Name Polarity Code 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:

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