As we all know, when using a benchtop Freeze Dryers for the first time, we must thoroughly clean all parts of the dryer. Everyone knows that stainless steel parts are cleaned with ethanol, and organic glass is cleaned with saline. Ampoules are cleaned with an ultrasonic cleaning machine, but what preparations do we need to do before actually operating the benchtop Freeze Dryers?
　　benchtop Freeze Dryerss must be pre-frozen before operation and use. Pre-freezing requires a low-temperature refrigerator at minus 40 degrees Celsius or minus 80 degrees Celsius. Place the items to be dried in a low temperature refrigerator or liquid nitrogen. It takes about four hours to observe directly from the outside. The freeze-drying experiment can be carried out only after the items are completely frozen. The items are quickly moved into the tray of the benchtop Freeze Dryers to ensure the freeze-drying effect.
　　The main unit and the vacuum pump are connected by a green vacuum tube, and the connection part uses an international standard clamp. In order to effectively prevent air leakage, this kind of clamp is specially designed with a sealing rubber ring in the clamp, apply an appropriate amount of vacuum grease on the rubber ring, and then clamp it with the clamp to make the connection closer Together, thereby effectively preventing air leakage. If the clamp is not clamped, it will cause air leakage, which will cause the instrument panel to display a digital value greater than 20pa when the vacuum is drawn. At this time, the air tightness of the vacuum pump and the glass cover of the benchtop Freeze Dryers should be checked.
　　There are two power sockets on the right side panel of the benchtop Freeze Dryers host. One connects the power cord of the vacuum pump to the host, and then plugs the main power source on the second benchtop Freeze Dryers.
　　Before the vacuum pump is running, it must be checked whether the vacuum pump oil is added, otherwise it will not operate normally. The oil level should not be lower than the center line of the oil mirror. When the vacuum pump is first used, there is a strong jitter, and it will gradually become stable.
　　If the air tightness is not good, apply some vacuum grease on the sealing rubber ring above the cold trap, lightly screw the plexiglass cover on the rubber ring, and test its tightness before opening the vacuum pump. To ensure the integrity of its closure.