Vacuum drying oven operation method, precautions and maintenance Vacuum drying oven operation method: 1. The items to be dried are placed in a vacuum drying box, the door is closed, the vent valve is closed, the vacuum valve is opened, and the vacuum pump is turned on to start pumping. When the vacuum in the box reaches -0.1 MPa, close the vacuum valve and turn off the vacuum pump. 2. Turn the vacuum oven power switch to the “on†position, select the desired set temperature, and the temperature inside the box begins to rise. When the temperature inside the box approaches the set temperature, The heating indicator light is suddenly turned on and off, repeated many times, and generally can enter the constant temperature state within 120 minutes. 3. When the required working temperature is low, a secondary setting method can be used. For example, the required temperature is 60 ° C, the first time can be set to 50 ° C, and the temperature overshoot starts to fall back. Set the temperature at 60 ° C a second time. This can reduce or even eliminate the temperature overshoot phenomenon and enter the constant temperature state as soon as possible. 4, according to the degree of moisture of different items, choose different drying time, such as longer drying time, lower vacuum, need to pump again to restore vacuum, The vacuum pump should be turned on before the vacuum valve is opened. 5. After the drying is finished, the power of the drying box should be turned off, the air release valve should be opened, the vacuum state inside the box should be released, and then the box door should be opened to take out the items. (After releasing the vacuum, if the sealing ring and the glass door are tightly deformed, it is not easy to open the door immediately. After a period of time, after the sealing ring is restored to the original shape, the door can be opened easily.) Vacuum drying oven precautions: 1. The vacuum box housing must be effectively grounded to ensure safe use. 2. When the vacuum box does not need continuous pumping, the vacuum valve should be closed first, then the vacuum pump power supply should be turned off, otherwise the vacuum pump oil should be poured into the box. 3, take out the torn items to be treated, such as the treatment of flammable items, must be cooled until the temperature is below the ignition point, in order to avoid the oxidation reaction caused by burning. 4. There is no explosion-proof device in the vacuum box, and it is not allowed to put the explosive materials into the dry. 5. It is best to cross the filter between the vacuum box and the vacuum pump to prevent moisture from entering the vacuum pump. 6. If it is not necessary, please do not open the side door at will to avoid damage to the electrical system. 7. This equipment should be equipped with a special air switch. 8. The electrical insulation is intact, and the equipment casing must have reliable protection grounding or protection to zero. 9, vacuum pump should always replace the vacuum pump oil. 10. When taking out the processed items, if the processed items are flammable, the air must be cooled until it is below the ignition point before the air can be placed to avoid the oxidation reaction causing the combustion. 11. This equipment has no explosion-proof device and should not be placed in explosive materials for drying. 12. When using the electric vacuum drying oven, special personnel must be taken care of to ensure the normal operation of the equipment. 13. When the electric vacuum drying oven is not used for a long time, the items in the working room should be taken out and wiped clean to keep the equipment dry. 14. An abnormal phenomenon occurs in the electric vacuum drying oven. It should be inspected and repaired in time. If it is not possible to accurately determine the fault, contact the technical department of the purchasing company. Vacuum drying oven maintenance: 1. The vacuum box should be kept clean at all times. The door glass should be wiped with a soft cotton cloth. Do not use a reactive chemical solvent to avoid chemical reaction and scratching the glass. 2. If the vacuum box is not used for a long time, it should be coated with neutral grease or petroleum jelly on the plated parts to prevent corrosion, and put on the plastic film dust cover to prevent it from being affected by moisture in the dry room.
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Vacuum drying oven operation method, precautions and maintenance