Shanghai Bilang briefly describes how to maintain the vacuum freeze dryer.
The working principle of the vacuum freeze dryer is to freeze the material so that the moisture contained in it becomes ice, and then sublimate the ice under vacuum to achieve the purpose of drying.
How to maintain the vacuum freeze dryer? Please note the following two points:
1. Maintenance during the use of vacuum freeze dryer
Samples should be prepared to enlarge the surface area as much as possible, which should not contain acid and alkali substances and volatile organic solvents. The sample must be completely frozen into ice, if any residual liquid will cause vaporization spray. Note that the cold trap is about minus 65 degrees. It can be used as a low-temperature refrigerator, but it must be worn with insulated gloves to prevent frostbite. Before starting the vacuum pump, check whether the water outlet valve is tightened, whether the inflation valve is closed, and whether the contact surface of the plexiglass cover and the rubber ring is clean and free of dirt and well sealed. Under normal circumstances, the machine must not be used continuously for more than 48 hours. The temperature of the sample gradually decreases during freezing, and the sample can be taken out and warmed up for a period of time (still in a frozen state) to continue drying to shorten the drying time. LCD display, Chinese interface, with sample drying curve. Imported compressors with additional heat exchangers increase the cooling capacity and the water-capturing capacity. The cold trap has a large opening, no inner coil, and a sample pre-freezing function. The pre-cooling rack can be used as a diversion barrel to speed up the drying speed. The cold trap and operating surface are all stainless steel, corrosion-resistant, easy to clean, and transparent bell jar. Transparent bell jar drying room, safe and intuitive. Stainless steel sample holder, adjustable common sample tray spacing. The design is novel, the volume is small, the operation is convenient, and the occupation of the laboratory table is reduced. Nitrogen inflation valve is optional.
2. Maintenance when the vacuum freeze-drying machine is switched on and off
Turn on the main power switch on the left side of the vacuum freeze-drying machine chassis, and the digital pressure display is atmospheric pressure 110pk. Press and hold the master switch on the control panel for more than three seconds, the temperature will be displayed as the actual temperature of the cold trap. Start the refrigerator and pre-cool for more than 30 minutes. Place the sample in the sample holder, cover the plexiglass cover, and start the vacuum pump. After the air pressure digital display is stable, record the temperature and air pressure values. Record the temperature and air pressure values ​​before the vacuum freeze-drying machine is shut down. Press and hold the inflation valve on the control panel and immediately turn off the vacuum pump. When the air pressure digital display is atmospheric pressure, open the plexiglass cover and take out the sample. Turn off the refrigerator, press and hold the main switch for more than three seconds, and finally turn off the main power switch. After the ice in the cold trap has completely turned into water, open the water outlet valve on the left side of the chassis to drain the water, clean the inner wall of the cold trap with a dry cloth, and cover it with a large piece of filter paper to prevent dust.
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