The fact that the recommended value (250 and 500 μmHg) has been reached does not guarantee that the
system is free of uncondensable gases and / or moisture.
To check the effectiveness of the process, after the registration has been closed and the
the pump must continue to monitor the pressure through the vacuum gauge.
If the pressure rises a little and then stabilizes, the vacuum is approved because the system is dry and tight.
If the pressure stabilizes at a value well above the recommended range, it indicates the presence of moisture in the system. In this case it is necessary to turn the pump on again and restart the vacuum process. If after 2 hours the pressure does not stabilize at any value, it indicates that the system is leaking.
