Pump exhaust is equipped with an external drainable silencer to collect condensed liquids.
1. Install the silencer in a horizontal position to prevent condensed liquids in the pump from return-
ing.
– Comply with the position indicated on the label.
2. Connect the external silencer exhaust to an exhaust pipe.
3. Install a draining device on the port designed for this purpose (1/8 Gas connection).
5.2.3 Connecting CP version pumps
Connecting the pumping connector of the housing
In installations that recirculate inert gas, fore pumping must be carried out before proceeding with the
treatment of inert gases. A DN 16 ISO-KF connector pumps the housing to remove any gases in this
area. Its only purpose is the initial fore pumping or after maintenance on the installation. It is not used to
recirculate inert gases. This fore pumping must be performed with the pump stopped. This function
must not be carried out when the pump is in operation.
Turbo
ACP (CP version)
Vacuum chamber
Inlet port
Exhaust port
CP port
5.2.4 Connecting the purge circuit
The gas purge consists of injecting an inert gas into the pump.
In this manual, the inert gas will be called ‘nitrogen’, as it is the most commonly used gas. For more
information about the type of purge gas, contact your Pfeiffer Vacuum service center.
DANGER
Danger of death by explosion when pumping gases containing pyrophoric/flammable materi-
als
There is a risk of explosion if pyrophoric materials above the LEL (Lower Explosive Limit) are sent to
the pump.
► Ensure there is a sufficient flow of nitrogen to lower the concentration below the LEL.
► Provide an interlock to ensure that gas flow towards the pump is stopped if the nitrogen flow is
interrupted.
The effect of nitrogen injection continuity on the process
If an interruption to the nitrogen flow represents a serious risk for the process, it is
advised to control the nitrogen supply with an external system capable of taking
over if the nitrogen circuit fails.
Installation
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Summary of Contents for ACP 28 CP
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