Freeze dryer (freeze dryer) is a precision low-temperature vacuum equipment. Improper operation can not only lead to experimental or production failure, but also cause equipment damage. In order to ensure stable operation of the equipment and perfect drying of the samples, the following are the core precautions that need to be strictly followed: the core operating red line (must not be done) strictly prohibits vacuuming before the samples are completely frozen. This is the first major taboo in the operation of the freeze-drying machine. Before starting the vacuum pump, the sample must be completely frozen into a solid (usually pre frozen below the eutectic point, such as -40 ℃ or lower). If the sample contains liquid water, vacuum it directly, and the liquid will boil violently (spray bottle), completely destroying the structure of the sample and causing the entire freeze-drying process to fail. It is strictly prohibited to use incompatible flammable solvents. Never handle flammable and explosive organic solvents such as ethanol and acetone in standard freeze dryers. The combination of vacuum chambers and electrical components can easily cause serious explosion risks. Special explosion-proof models must be used to handle such samples. It is strictly prohibited to open the vacuum chamber or organic glass cover prematurely or under pressure until the freeze-drying program is completely completed and the system has returned to normal pressure. This not only causes a sudden influx of humid air from the outside, causing severe moisture regain in already dried samples, but may also damage the equipment due to pressure differences. Overloading operation is strictly prohibited. Do not put in samples that exceed the water capture capacity of the equipment at once. Excessive samples can cause sublimated water vapor to exceed the condensation capacity of the cold trap. Once water "penetrates" into the vacuum pump, it quickly emulsifies the pump oil, causing a decrease in vacuum pump performance or even scrapping.   🔬  Key operational details (must be noted): Standardize the sequence of power on/off and vacuum breaking. Shutdown sequence: The vacuum pump must be turned off first, and then the inflation valve (vacuum breaking) must be slowly opened. After the pressure inside the chamber returns to atmospheric pressure, the main power can be turned off. This can effectively prevent the contamination of samples and equipment caused by the backflow of vacuum pump oil. Startup interval: After the refrigeration compressor is shut down, if it needs to be restarted, it is necessary to wait for at least 3-10 minutes to protect the compressor. Protect the vacuum pump and cold trap by regularly changing the oil: Vacuum pump oil is the "blood" of the equipment. When the cumulative working time reaches 200-300 hours, or when the color of the pump oil turns brown or emulsified, it is necessary to replace the same model of vacuum pump oil in a timely manner. Cold trap defrosting: After each batch of freeze-drying is completed, it is necessary to wait for the frost in the cold trap to completely melt, and thoroughly dry the accumulated water in the cold trap and chamber to keep the interior dry and clean. Proper sealing and daily maintenance inspection of sealing rings: Before each use, check whether the rubber sealing ring of the drying chamber (organic glass cover) is intact, free of cracks and debris. The aging or dirtiness of the sealing ring is a common reason for the inability to increase the vacuum degree. Cleaning taboos: When cleaning organic glass covers or transparent chambers, it is strictly prohibited to use organic solvents such as alcohol to wipe, otherwise it may cause cracks or even explosions in plastic parts. Only wet cloths or neutral cleaning agents can be used for wiping. Pay attention to operational safety and prevent frostbite: When operating pre frozen samples, coming into contact with cold traps, or handling liquid nitrogen, it is necessary to wear professional low-temperature protective gloves to prevent serious frostbite caused by direct skin contact with extremely low-temperature objects. Environmental requirements: The equipment should be placed in an environment with suitable temperature and humidity (usually 10 ℃ -30 ℃, humidity ≤ 80%), good ventilation, and away from strong electromagnetic field interference. The back of the equipment should be kept at least 30cm away from the wall for heat dissipation.

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