Preparation Before Starting Vacuum Freeze Dryer

Vacuum freeze dryers are abbreviated as freeze dryers, which are widely used in food, biopharmaceutical, chemical, new materials and other fields. Its working principle is to freeze the water-containing material into a solid state, and then sublime the water from the solid state into a gaseous state, so as to remove the water and preserve the material.
 
In order to make the vacuum freeze dryer run smoothly and efficiently, all preparations before starting up must be carefully done:
1. Check whether the power supply voltage used by the freeze dryer is normal, and whether the switches on the control cabinet are in the reset position;
2. Check whether the temperature measuring probe in the freeze-drying box of the freeze dryer is placed accurately.
3. Check whether the lubricating oil of the refrigerator meets the requirements of being clear and non-sticky, and whether the oil level is in the middle of the oil immersion objective;
4. Check whether the vacuum oil in the vacuum pump of the freeze dryer meets the requirements of being clear and non-sticky, and whether the oil level is in the middle of the oil immersion objective;
5. Check whether the cooling water pressure, flow, and water temperature meet the requirements;
6. Check whether all valves in the refrigeration system are in the start position;
7. Check whether the valve position in the vacuum system meets the normal working requirements, and all valves leading to the atmosphere should be closed;
8. Check whether the defrosting water in the cold trap has been completely drained.
9. Check whether the valve position in the intermediate medium circulation system meets the normal working requirements. The valve to the atmosphere should be closed tightly, and the other valves should be open.
10. Check the set value of each pressure controller.
 
Vacuum freeze-drying technology has a wide range of applications in the fields of bioengineering, pharmaceutical industry, food industry, material science, and deep processing of agricultural and sideline products. According to the purpose, freeze dryers can be divided into laboratory freeze dryers, pilot freeze dryers, industrial freeze dryers and household freeze dryers. In the actual use process, we should choose the appropriate type of freeze dryer according to our needs and requirements.