Surface thermocouple leakage factors1

Surface thermocouple for probe unique, easy to carry and is widely used in textile, printing and dyeing, paper making, plastic, rubber and other fields. Although the thermocouple on the surface of a more precise instrument, but it will also and other instrumentation products, in use process happen some fault. Among them, the surface thermocouple leakage problem is a common problems in use, what are the causes of surface thermocouple leakage? Surface thermocouple

there are two reasons for the leakage of:

1, electric furnace refractory at high temperature insulation fault: equipped with wire furnace furnace wall inserted with the surface of the metal wire in contact with the surface thermocouple, thermocouple is easy to make furnace refractory brick is a good insulating material, at room temperature but as temperatures rise, insulation performance will decline significantly. Resistance furnace lining with alumina refractory brick for the most part, its resistance value also significantly reduced with temperature rise.

2, furnace wire contact with the surface thermocouple: platinum rhodium surface thermocouple protection tube is alumina ceramic tube, accidentally silk made separation insulation porcelain tube wear, under the high temperature insulation performance also want to reduce, cause leakage, the leak to the surface thermocouple, so there is ac leakage on the surface thermocouple signals.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor