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As we all know, when using the bench-top type Freeze Dryer for the first time, we must thoroughly clean the parts of the dryer. Everyone knows that stainless steel parts are washed with ethanol, and plexiglass is washed with physiological saline. Ampoules are cleaned with an ultrasonic cleaner, but what do we need to do before actually operating the bench-top type Freeze Dryer?
The tabletop freeze dryer must be pre-frozen before operation. The pre-freezing needs to prepare a low-temperature refrigerator, minus 40 degrees Celsius, or minus 80 degrees Celsius low-temperature refrigerator. Place the items to be dried in a low-temperature refrigerator or liquid nitrogen, generally It takes about four hours to observe directly from the outside. Only after the items are completely frozen, can the freeze-drying experiment be carried out. The items are quickly moved into the tray of the desktop freeze-dryer to ensure the freeze-drying effect.
The green vacuum tube connects the main unit and the vacuum pump, and the connection 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, apply an appropriate amount of vacuum grease on the rubber ring, and then clamp it with the clamp to make the connection more closely fit. Together, to effectively prevent air leakage. If the clamp is not clamped, it will cause air leakage, which will cause the instrument panel to display a digital display value greater than 20pa during vacuum extraction. At this time, the air tightness 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 panel of the main unit of the bench-top type Freeze Dryer. One connects the power cord of the vacuum pump to the main unit, and then plugs the total power supply of the second bench-top type Freeze Dryer into the power source.
Before the operation of the vacuum pump, you must check whether the vacuum pump oil is added, otherwise it will not run normally. The oil level should not be lower than the center line of the oil mirror. The vacuum pump will shake strongly when it is first used, and it will gradually become stable.
If the air tightness is not good, you should apply some vacuum grease to the sealing rubber ring above the cold trap, lightly rotate the organic glass cover on the rubber ring, and test the tightness by turning on the vacuum pump. To ensure its integrity.
