K type thermocouple is how to distinguish between the cathode?

K type thermocouple is above 500 ℃ of dosage biggest metal thermocouple temperature measurement area, its usage is the sum of other metal thermocouple. Today we will learn about the K type thermocouple is negative how to distinguish.

we are to understand what is negative in the first place. The anode ( KP) In the name of the chemical composition is: Ni: Cr material 90:10, the cathode ( KN) The chemical composition of the is: Ni: Si material 97.

K type thermocouple linearity, thermoelectric emfs is bigger, so can be used for oxidizing, inert atmosphere. But K type thermocouple cannot be directly used for sulfur, reducing or at high temperature reduction, oxidation atmosphere and vacuum alternately, is also not recommended for people with weak oxidizing atmosphere. It is very nickel-chromium alloy (containing 10% chromium KP) , the negative is extremely containing silicon 3% nickel silicon alloy ( KN) 。 Therefore, armoured thermocouple how points are negative? Based on this feature, use the magnet can be easily identified armoured thermocouple of positive and negative pole.

as for the other thermocouple is negative to distinguish is also very simple, first is the nickel chrome - Nickel silicon thermocouple, it has obvious color to distinguish the two root silk, there is a green, one is gray, green is positive, if they are armoured thermocouple wire, you can use a small magnetic materials, on the cathode surface, the root is the gray silk, attractive if it is negative.

K type thermocouple knowledge:

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