Answer: Muffle furnace more than the set temperature 15-20 degrees is normal, in the process of heating, ammeter sometimes drops to zero and there is a normal number, more than the set temperature is too high will automatically cut off the current to cool down, if lower than the set temperature program will automatically replenish the current to heat up, if the overtemperature 50 °C need to pay attention. In addition, if it has not been lowered after an hour, it is possible that the place where the thermocouple wiring is about to burn, and it is recommended to overhaul it.
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