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    Home > Active Ingredient News > Drugs Articles > Precautions for use of freeze dryer

    Precautions for use of freeze dryer

    • Last Update: 2014-08-06
    • Source: Internet
    • Author: User
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    Turn on the machine: 1 Turn on the main power switch on the left side of the case, the air pressure digital display is atmospheric pressure 110pk; 2 Press and hold the main switch on the control panel for more than three seconds, and the temperature digital display is the actual temperature of the cold well; 3 Start the refrigerator, precooling for more than 30 minutes; 4 Put the sample into the sample rack, cover the plexiglass cover, and start the vacuum pump; 5 When the air pressure digital display is stable, record the temperature and air pressure values Shut down: 1 Record the temperature and air pressure before shut down; 2 Press and hold the inflation valve on the control panel, and immediately close the vacuum pump; 3 When the air pressure digital display is atmospheric pressure, open the plexiglass cover and take out the sample; 4 Shut down the refrigerator, press and hold the main switch for more than three seconds, and then turn off the main power switch; 5 After the ice in the cold trap is completely turned into water, open the water outlet valve on the left side of the case to drain water, clean the inner wall of the cold trap with a dry cloth, and cover with a large piece of filter paper to prevent dust Note 1: the surface area of the sample should be expanded as much as possible, which should not contain acid and alkali substances and volatile organic solvents; 2 The sample must be completely frozen into ice, if there is residual liquid, it will cause gasification jet; 3 Note that the cold trap is about 65 degrees below zero, which can be used as a low-temperature refrigerator, but it must wear insulation gloves to prevent frostbite; 4 Before starting the vacuum pump, check whether the outlet valve is tightened, whether the inflation valve is closed, and whether the contact surface between the plexiglass cover and the rubber ring is clean, free of dirt and well sealed; 5 in general, the machine shall not be used continuously for more than 48 hours; 6 During the freezing process, the temperature of the sample decreases gradually After the sample is taken out and warmed for a period of time (still in the frozen state), it can be dried continuously to shorten the drying time.
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