Introduction: Vacuum freeze dryer is not common in daily life, because it is generally used for the drying of wild vegetables, high-grade raw material medicines, Chinese herbal medicines, biological, dehydrated vegetables, fruits, chemicals, etc. The following is the use of vacuum freeze dryers. In the six major considerations. What are the precautions for the freeze dryer? 1. When the sample is prepared by a freeze dryer, its surface area should be enlarged as much as possible. It must not contain acid-base substances and volatile organic solvents.
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2, the product must be completely frozen into ice, if any residual liquid will cause gasification spray;
3, pay attention to the freezing trap cryogenic about minus 65 degrees, can be used as a low temperature refrigerator, but must wear insulated gloves to prevent frostbite;
4. Before starting the vacuum pump, check whether the water outlet valve is tightened, and whether the air filling valve is closed. The contact surface between the organic glass cover and the rubber ring is clean and free from dirt and is well sealed;
5, under normal circumstances, the freeze dryer can not be used continuously for more than 48 hours;
6. Finally, during the freezing process of the sample, the temperature gradually decreases. After the sample is taken out and warmed up for a period of time, the drying is continued to shorten the drying time.