Vacuum freeze dryer use and precautions

Vacuum freeze dryer use and precautions

Freeze dryers are very common in daily life, but many people are not very clear about how to use freeze dryers. The precautions for freeze dryers are not well understood. The technicians of Shanghai Zhixin Freeze Dryers carry Let's go to a more comprehensive understanding of the letter freeze dryer.

First of all, let's take a look at the use of the Zhixin freeze dryer:

1. Open the main power switch on the left side of the chassis of Shanghai Zhixin Freeze Dryer. The air pressure is displayed as atmospheric pressure 110pk;
2. Press and hold the total opening key on the control panel of the (Shanghai Zhixin) freeze dryer for more than three seconds, and the temperature is displayed as the actual temperature of the cold trap;
3. Start the Shanghai Zhixin freeze dryer chiller and pre-cool for more than 30 minutes;
4. Place the sample into the sample holder, cover the plexiglass cover, and activate the vacuum pump;
5 After the pressure of the Shanghai Zhixin Freeze Dryer is stable, record the temperature and pressure values.
Downtime
6. Record the temperature and pressure values ​​before shutdown;
7. Press and hold the inflation valve of the control panel of the freeze dryer and immediately turn off the vacuum pump;
8. When the pressure is displayed as atmospheric pressure, open the plexiglass cover and take out the sample;
9. Turn off the refrigerator of Zhixin Freeze Dryer, press and hold the total opening key for more than three seconds, and finally turn off the main power switch;
10. After the ice in the cold trap is completely turned into water, open the water outlet valve on the left side of the cabinet to drain the water, and clean the inner wall of the cold trap with a dry cloth, and cover the large filter paper to prevent dust.
After understanding how the Zhixin Freeze Dryer is used, let's take a look at what needs to be paid attention to in the freeze dryer in daily life.
1. Prepare samples by using the letter freeze dryer to maximize the surface area, which should not contain acid-base substances and volatile organic solvents;
2, the sample must be completely frozen into ice, if there is residual liquid will cause gasification injection;
3, pay attention to know that the freeze dryer cold trap is about minus 65 degrees, can be used in low temperature refrigerators, but must wear thermal insulation gloves to prevent frostbite;
4. Before starting the vacuum pump, check whether the water outlet valve is tightened, whether the inflation valve is closed, whether the contact surface of the plexiglass cover and the rubber ring is clean and free of dirt, and is well sealed;
5. Under normal circumstances, the freeze dryer should not be used continuously for more than 48 hours;
6. During the freezing process, the temperature gradually decreases. The sample can be taken out and warmed for a while, and then dried to shorten the drying time.