Figure 17. Installing the gas ballast adaptor
8.1.3Silencer
The pump silencer has two main functions.
▪ To reduce exhaust noise during pump down and gas ballast operation.▪
▪ To collect and retain tip seal dust as the pump is operated.▪
Exhaust gases exit the exhaust port when the pump is being used to
evacuate a process chamber, when the gas ballast control is being used, or
both. The noise level when pumping down rises as the throughput increases
and the silencer is used to reduce this noise level.
The outer can is made of pressed steel and is split to allow access to the
lter elements.
The lter element housing is made from SantopreneÒ thermoplastic
elastomer. The element itself is polyester. The foam block is manufactured
from lter foam.
Note:
The pump silencer has been manufactured with an NW25 tting to enable
tting to the pump exhaust. An NW25 clamp and centering ring are
included.
300668736_002_C7 - © Leybold 49
Accessories
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