Precautions for using a muffle furnace

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1. When a muffle furnace is used for the first time or again after being out of use for an extended period, it must be baked out. The furnace drying time should be four hours at a room temperature of 200°C. 200°C to 600°C for four hours. 2. The muffle furnace and controller must operate in an environment with a relative humidity of no more than 85%, free from conductive dust, explosive gases, or corrosive gases. 3. The muffle furnace controller should be used only within an ambient temperature range of 0–40°C. 4. In accordance with technical requirements, regularly check whether the connections of the electric furnace and controller are in good condition; verify that there is no sticking or hesitation in the movement of the gauge pointers. Additionally, use a potentiometer to determine any increases in error caused by factors such as magnets, demagnetization, wire expansion, fatigue of elastic components, or disruption of balance. 5. Do not pull the thermocouple out suddenly at high temperatures to prevent the outer cover from bursting. 6. Keep the furnace chamber clean regularly, and remove oxides and similar substances from within it in a timely manner.