DYNAVAC NovaDryer-DHF400 Manuale di installazione e funzionamento rapido - Pagina 10

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Reason 2: Characteristics (such as water contents) of the materials itself does not allow to reach a pressure (e.g. 30Pa)

as set for pre‐vacuum which is lower than the vacuum degree (e.g. 45Pa) displayed on the Main Menu.

It means the materials can finish freeze drying in the vacuum degree (e.g. 45Pa) displayed on the Main Menu. And it is

impossible to reach the lower pressure (e.g. 30Pa) as set for pre‐vacuum.

Solution:

Step 1. Do NOT stop the freeze dryer.

Step 2. Go to Main Menu, Press "FORMULA". Modify "Pre‐Vacuum Pressure from 30(Pa) into a value (e.g. 60Pa) higher

than vacuum degree (e.g. 45Pa) as displayed on the main menu

*This is because pre‐freeze stage has completed before re‐start and it needs to skip this stage after re‐start. So the

pre‐freeze stage can run only for 1 minute then go to vacuum pumping stage quickly.

Step 4.Go to Main Menu, press "OPERATION". On OPERATION menu, press "Stop Vacu. Alarm" to eliminate vacuum alarm.

Then the freeze dryer can continue to run in good condition without vacuum alarm.

The Problem is solved.