Explanation of thermocouple leakage causes and prevention

Thermocouple is the main reason of the leakage, electric insulating refractory brick because at high temperature in adverse, so the installation of the furnace wall, furnace silk insert the thermocouple with a metal tube, are more likely to lead to the contact of the furnace and thermocouple, firebrick if at room temperature, is equipped with high and good insulation material, but because the temperature keeps rising, will gradually decline in the performance of the insulation.

the way prevent leakage in thermocouple are the following: 1. Ensure that the thermocouple and don't contact between refractory brick; 2. The thermocouple can be negative to the ground, the thermocouple signal to eliminate the leakage; 3. Can be installed in the output end of the thermocouple location, can filter device; 4. Directly from the thermocouple in the location of the hot junction, the ground wire leads and connected to the ground; 5. Throughout the thermocouple on the surface, adding of silicon carbide tube or heat-resistant steel tube, then the access to the ground.