Safety precautions for muffle furnace include the following:
1. Ensure proper safety gear: Always wear safety glasses and protective clothing when working in the oven room. Use gloves and tongs while handling specimens.
2. Keep the furnace away from inflammable materials: When the muffle furnace is heated, the furnace jacket will also become hot. Keep the furnace away from flammable substances and ensure easy heat dissipation outside the furnace to avoid accidents and scalding.
3. Regular maintenance: Take care of the furnace frequently to prevent accidents caused by the failure of automatic control. Do not use the furnace when there is no one on duty at night.
4. Allow the furnace to cool naturally: After using the muffle furnace, cut off the power supply and allow it to cool naturally. Avoid opening the furnace door immediately to prevent sudden cold cracking. The furnace door should only be opened when the temperature drops below 200 °C.
5. Stable placement and appropriate power supply: The muffle furnace must be placed on a stable cement platform and equipped with plugs, sockets, and fuses with appropriate power. It should also be grounded to avoid danger.
6. Safe working environment: The working environment should be free of flammable substrates, explosive substances, and corrosive gases. It is forbidden to bake liquid samples such as water and oil directly in the furnace. The furnace should be kept clean.
7. Temperature control: During use, the furnace chamber temperature should not exceed the maximum furnace temperature, and it should not work for a long time under the rated temperature. Users should not leave the furnace unattended and should pay attention to temperature changes. In case of any abnormality, the power should be cut off immediately and professional maintenance personnel should be called.
8. Quenching precautions: When using oil as a quenchant, be cautious as it can catch fire. Cover the quench tanks when not in use to prevent water contamination. Quench oil is hot, so splashes or skin contact may cause burns.
9. Avoid operating the furnace when vibrating and pulling out the thermocouple at high temperatures to prevent jacket burst.
10. Avoid heating fats with metallic materials: Heating fats with metallic materials can produce a large number of volatile and corrosive gases that can affect the surface of the heating element and shorten its life expectancy.
11. Daily maintenance: When the muffle furnace is used for the first time or after a long-term shutdown, it must be dried. The furnace should be kept clean, and oxides and other substances should be removed in a timely manner. The furnace should work below the maximum temperature of 50°C to prolong the service life of the furnace wire.
12. Proper working environment for the controller: The muffle furnace controller should work in a place where the relative humidity does not exceed 85% and there are no conductive dust, explosive gas, or corrosive gas. If metal materials with grease need to be heated, precautions should be taken to prevent damage to the electric heating element.
13. Regularly check wiring and ground connections: Check the wiring of the electric furnace and the controller regularly to ensure they are in good condition. Ground the metal protection tube of the thermocouple to reduce interference. Use a three-wire output thermocouple if necessary.
14. Follow proper operating procedures: Do not exceed the maximum temperature of the muffle furnace. Cut off the power supply when loading and taking samples to prevent electric shock. Keep the opening time of the furnace door short to prolong the furnace's service life. Do not fill any liquid into the furnace or put samples with water and oil into the furnace. Wear gloves when loading and taking samples to prevent scalding. Place the sample in the middle of the furnace and ensure it is neatly arranged.
These safety precautions are important to ensure the safe and efficient operation of a muffle furnace and to prevent accidents or damage to the equipment.
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