Operation
20 300758785_002_C1 - 06/2019 - © Leybold
4.3 Gas Ballast
If the process contains mainly permanent gases, the ECODRY plus may be
operated without gas ballast.
If the composition of the gases to be pumped is not known and if condensa-
tion in the pump cannot be ruled out, run the pump with the gas ballast valve
open.
Pumping of Condensable Gases and Vapours
If the gas ballast valve is open when the temperature is at operating level, the
ECODRY plus can pump water vapour within the limits specified in the tech-
nical data. If the vapour pressure rises above the permitted water vapour tol-
erance, the gasses condense to vapour in the pump.This can lead to corro-
sion and thus damage to the pump.
Before pumping out vapours, open the gas ballast valve and warm up the
pump for around 30 minutes with the inlet line closed.
Running under gas ballast has a detrimental effect on the ultimate pressure
which can be achieved.
Gasballast geschlossenGasballast geöffnet
Fig. 3.4 Gas ballast switch
Gas ballast closedGas ballast open
The operating area of the gas ballast switch can
be distorted contrary to the depiction.
Hexagon socket for
unscrewing the gas
ballast switch
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