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How to distinguish WRNK thermocouple is negative _ instrument

by:JVTIA     2020-10-28
WRNK thermocouple protective mining have stainless steel, full of high-density oxide material inside insulation, therefore, thermocouple strong pollution resistance and mechanical strength, suitable for installation in harsh environment. Thermocouples can be used to measure - 200 - 600 ℃ temperature range, can be connected directly with copper wires and secondary instrument use, due to the thermocouple has good electrical output characteristic, can be adjusted to display instrument, recorder, instrument, scanner, data recorder and computer provide accurate temperature signal. K type thermocouple is above 500 ℃ of dosage big metal thermocouple temperature measurement area, its usage is the sum of other metal thermocouple. The chongqing instrument for everybody to introduce how to distinguish the thermocouple is negative. Is negative in 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. 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, thermocouple how points are negative. Based on this feature, use the magnet can be easily identified 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 is the thermocouple wire, you can use a small magnetic materials, on the cathode surface, the root is the gray silk, attractive if it is negative.
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