Pfeiffer Vacuum ACP 28 CP, Руководство по эксплуатации

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6.6 Purge operation
Principle
A gas purge circuit protects the low- and high-pressure ball bearings and dilutes trace amounts of corro-
sive gases.
Commissioning
To operate the purge, there must be a neutral gas supply with the required characteristics (see chapter
“Nitrogen characteristics”).
When the neutral gas supply is connected to a purge connection:
● Start the purge according to the recommended flow rate values.
Recommendations
To ensure the appropriate removal of corrosive gases by the exhaust, we do not recommend connect-
ing an ES25S.
Also refer to the “Matrix gas/applications” chapter.
6.7 Gas ballast and purge operation on CV version
Principle
The combined use of the gas ballast and the purge allows large amounts of condensable vapors to be
removed.
Commissioning
To better pump with condensable vapors or moist air, it is necessary to operate with a hot pump and to
use a nitrogen supply with the required characteristics (see chapter “Nitrogen characteristics”). Proceed
as follows:
1. Isolate the pump from the system (inlet isolation valve closed) and
allow it to operate for 1 hour
with the gas ballast open .
2. Then, open the isolation valve: the pump operates under the best conditions by reducing the risk
of condensation inside the pump.
3. Start the purge according to the recommended flow rate values.
4. Check the level of condensable products in the external silencer and drain it when necessary.
Recommendations
The gas ballast can be automated: this accessory is available upon request (see chapter “Accesso-
ries”, page 45) . Likewise, the gas ballast can be supplied with filtered dry air or nitrogen. Contact your
service center.
Also refer to the “Matrix gas/applications” chapter.
Operation
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