Introduction: Freeze dryer should pay attention to pre-cooling more than 30 minutes when the machine is turned on, and the air pressure is displayed as atmospheric pressure 110pk. After the air pressure is stable, record the temperature and pressure value. When the freeze dryer stops, when the air pressure is at atmospheric pressure, Open the plexiglass hood and take the sample. Press and hold the main switch for more than three seconds to turn off the main power. The following are the precautions when operating the freeze dryer.
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.
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