SED-4DG-B — Vacuum Freeze Dryer

Material is loaded onto the shelf layers inside the freeze-drying chamber. The refrigeration system(BITZER compressor) lowers shelf temperature to freeze the product; the vacuum system(ULVAC pump) then reduces chamber pressure below the triple point of water. Under vacuum and low temperature, ice sublimes directly to vapor, which is captured by the cold trap. Vacuum level is automatically controlled by PLC, enabling multiple vacuum set-point changes within a single freeze-drying cycle to optimize the drying curve. At cycle end, the product is dry-sealed under vacuum or inert gas.