Why the thermocouple will appear the situation of the leakage

Due to the development of the industry in constant, thermocouple has more superior performance, therefore, in the whole industrial production has been very widely used, however, because of the thermocouple in the process of application, there are a variety of problems, and common should be leakage failure, small make up is the key to introduce thermocouple under the leakage reason, hope can bring you help, for reference only.

a wire and contact between the thermocouple, furnace, due to the thermocouple protection tube on platinum, rhodium, mainly adopts the alumina ceramic tube, and accidentally silk is wear on the porcelain tube, so that we can ensure that the insulation between the two separated, but if it is at high temperature, with the decrease of the insulation performance is, and the leakage, leakage to the thermocouple, so that the thermocouple is sure to appear ac leakage signal. Second, refractory in the furnace under the condition of the high temperature, insulation of adverse condition, mainly in the installation of furnace wall furnace silk, directly insert the thermocouple with a metal tube, this will be more prone to the contact between the thermocouple and silk, so the refractory material due to insulation in room temperature were removed, but will change with temperature rising, it can appear on the performance of the insulation must be more significant decline. Although the resistance type electric furnace, basic on the lining are used in alumina refractory brick, but also because of the rise of temperature, and prompted a serious decline in its resistance value.