The pilot freeze dryer must be pre-frozen before operation and use. The pre-freeze needs to prepare a low-temperature refrigerator, minus 40 degrees Celsius, or minus 80 degrees Celsius low-temperature refrigerator, and place the items to be dried in a low-temperature refrigerator or liquid nitrogen It usually takes about four hours....
The pilot freeze dryer must be pre-frozen before operation and use. The pre-freeze needs to prepare a low-temperature refrigerator, minus 40 degrees Celsius, or minus 80 degrees Celsius low-temperature refrigerator, and place the items to be dried in a low-temperature refrigerator or liquid nitrogen It usually takes about four hours. ...