For the first time using a bench-top type Freeze Dryer, see here

　　For the first time using a bench-top type Freeze Dryer, see here
　　The correct way to use is to ensure the long-term operation of the bench-top type Freeze Dryer, so what should you pay attention to when running the bench-top type Freeze Dryer for the first time?
　　When using the bench-top type Freeze Dryer for the first time, all parts of the instrument must be thoroughly cleaned. The stainless steel parts are cleaned with ethanol and the plexiglass is washed with normal saline.
　　Pre-freezing must be carried out before freeze-drying. Pre-action needs to prepare a low-temperature refrigerator, minus 40 degrees Celsius, or a low-temperature refrigerator with a temperature of minus 80 degrees Celsius. It takes about four hours to put the items to be dried in a low-temperature refrigerator or liquid nitrogen. It can be observed directly from the outside, after the item is completely frozen in ice, the freeze-drying experiment can be carried out to quickly move the item into the tray of the bench-top type Freeze Dryer to ensure the freeze-drying effect.
　　The main unit of the bench-top type Freeze Dryer is connected to the vacuum pump by a green vacuum tube, and the joint uses international standard clamps. In order to effectively prevent air leakage, this type of clamp is specially designed with a sealing rubber ring in the clamp. In the method of preventing air leakage, apply a proper amount of vacuum grease on the rubber ring and then clamp it with a clamp to make the joints fit closer together. If the clamp is not clamped, air leakage will occur, causing the display value of the instrument panel to be greater than 20pa when vacuum is drawn. At this time, the airtightness of the vacuum pump and the glass cover of the bench-top type Freeze Dryer should be checked.
　　There are two power sockets on the right side of the bench-top type Freeze Dryer main unit. One connects the vacuum pump's power cord to the main unit, and then plugs the main power supply on the second bench-top type Freeze Dryer into the power supply.
　　Before the vacuum pump is running, it must be checked whether vacuum pump oil is added, otherwise it will not operate normally. The oil level must not be lower than the center line of the oil mirror. The vacuum pump has a strong shaking when it is used at the beginning, and it will gradually become stable. If the air tightness is not good, apply some vacuum grease to the sealing rubber ring above the cold trap, gently rotate the plexiglass cover on the rubber ring, and test the air tightness by opening the vacuum pump to ensure the integrity of the gas seal.