Description

NiCr-NiSi (Type K) thermocouple finds the widest use in all base metal thermocouple, at temperature above 500℃.The main chemical composition of positive leg NiCr (KP) are Ni≈90% and Cr≈10%; negative leg NiSi (KN) are Ni≈97% and Cr≈3%. The operating temperature range is -200~1300℃(for short term) and 0~1100℃( for long term).

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

Technical Data

Thermo-electrical & Electrical Value in Soft-Annealed Condition:

Type: KX

Size: 7/0.525mm (Tolerance ±0.008~0.009mm)

Standard:  IEC60584-3

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Physical Properties

                                                                                                      KPX          KNX

Density at 20℃ -------------------------------------------------------------   8.60           8.60

Melting Point  ---------------------------------------------------------------  1427℃        1360℃

Tensile Strength (Soft annealed condition in 20℃) ---------------   ≥490Mpa     ≥390Mpa

Elongation (Soft annealed condition in 20℃) -----------------------   ≥10%         ≥15%

Resistivity at 20℃ (μΩ.m) --------------------------------------------------   ≤0.70        ≤0.32