When using a freeze dryer should pay attention to what factors

1. When preparing the sample, the surface area should be enlarged as much as possible, and must not contain acid substances and volatile organic solvents;

Second, the sample must be completely frozen into ice, if there is residual liquid will cause gasification spray;

3. Note that the cold trap is 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 outlet valve is tightened, and whether the inflation valve is closed. The contact surface between the organic glass cover and the rubber ring is clean and free from dirt and seals well.

5. Under normal circumstances, the aircraft shall not be used continuously for more than 48 hours;

6. Finally, note that during the freezing process, the temperature of the sample gradually decreases. After the sample is taken out and warmed up for a period of time (still in the frozen state), drying is continued to shorten the drying time.