Everyone knows that when using a refrigerated dryer, we must thoroughly clean all parts of the dryer. However, many people do not know that stainless steel parts are washed with ethanol, while organic glass is washed with normal saline, and ultrasonic cleaners are used for cleaning. So what should we prepare before operating the refrigerated dryer? Now let's follow Xiao Bian to understand.
1. The refrigerated dryer must be frozen before use. Pre freezing requires the use of a low temperature refrigerator at - 40 ° C or - 80 ° C. Put the articles to be dried in a low temperature refrigerator or liquid nitrogen. It usually takes about 4 hours to observe directly from the outside. The freeze-drying experiment can only be carried out after the articles are completely frozen. Quickly move the item to the frost drying tray to see the frost drying effect.
2. The main body and vacuum pump are connected by green vacuum pipe, and international standard clamps are used for connection. In order to effectively prevent air leakage, this type of fixture is specially designed and equipped with a sealing rubber ring. Before clamping, apply an appropriate amount of vacuum grease. Make the connection tighter, so as to effectively prevent air leakage. If the clamp is not tightened, air will leak on the instrument panel when vacuuming, and the digital display value will reach 20pa or higher. At this time, check the air tightness of the glass cover of the vacuum pump and the freeze dryer.
3. There are two power sockets on the right panel of the refrigeration dryer host. One connects the power cord of the vacuum pump to the host, and the second freeze-drying machine is connected to the power supply.
4. Before operating the vacuum pump, it is necessary to check whether the vacuum pump oil is added. If it is not added, it will not work properly. The oil level shall not be lower than the centerline of the oil mirror. When first used, the vacuum pump will vibrate violently and gradually stabilize.
5. If the air tightness is poor, apply vacuum grease on the sealing rubber ring at the top of the cold trap, gently twist the plexiglass cover of the rubber ring to test the air tightness, and then turn on the vacuum pump. To ensure the integrity of its closure.
