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20901544_E12C+16C_NT Vsel_V1.2_260922
Installation and connection
4.4.4
4.4.4 Gas ballast (GB)
Gas ballast (GB)
Use of ambient air as gas ballast
DANGER
DANGER
Risk of explosion from air as gas ballast.
By using air as gas ballast, small amounts of oxygen
get inside the vacuum pump. Depending on the pro
‑
cess, the oxygen in the air can form an explosive mix
‑
ture or other dangerous situations can arise.
>
In the case of ignitable substances and for processes
in which an explosive mixture can arise, only use in‑
ert gas as gas ballast, e.g. nitrogen (max. 1.2 bar /
900 Torr abs.)..
(d)
If ambient air is to be used as gas ballast, nothing needs to
be connected at the diaphragm pump; gas ballast valve
(d)
.
see also chapter 5 .2 .2 Operation with gas ballast on page 43
5 .2 .2 Operation with gas ballast on page 43
Example
Position of gas
ballast valve
