Carefully check whether the grounding wires of temperature measuring instruments, thermocouples, and electrical equipment are intact. Check whether there are other workpieces in the furnace and whether the furnace bottom plate and resistance wire are intact. Whether the furnace door opening and closing mechanism is flexible, etc.Vacuum Furnaces Leaks and Detection Techniques Turn on the power. After a few seconds, the circuit starts to work and the signal light turns on. Place the adjustable thermometer millivolt meter at the required scale. The electric furnace is heated and the constant temperature is automatically maintained.Process optimization of alumina ceramic sintering technology ③Heating should be carried out step by step for the first time, that is, 20-200℃ for 3 hours, 200-400℃ for 3 hours, and 400-600℃ for 2 hours.Atmospheric Pressure and Vacuum Sintering of High Purity Dense MgO Ceramics ④The loading and unloading of workpieces must be done without power. When loading the furnace, do not throw workpieces with force to avoid damaging electric heating elements, furnace bottom plates, etc.; it is strictly prohibited to load wet workpieces into the furnace to avoid breaking the refractory bricks on the furnace wall; cylindrical-grinding the workpieces and electric heating elements heated in the furnace should be kept at 50-50°C. 7Omm distance; workpieces should be placed neatly and not stacked too high to avoid damaging the thermowell.