Connect The Pump Outlet; Gas-Ballast Inlet Connection - Edwards E2M28 Instruction Manual

A373-10-880 Issue T
pressure rating that is greater than the highest pressure that can be generated in the system. Edwards
recommends using Edwards flexible bellows.
Use a suitable inlet catchpot if pumping condensable vapours or if using the pump for very dusty

applications.
Ensure that sealing surfaces are clean and scratch-free.

Connect the vacuum system to the inlet-port
Connect to the NW25 flange supplied: use the NW25 centring-ring and O-ring supplied.

Remove the NW25 flange and connect to the 1 inch BSP threaded hole.

Use an NW25 to 28 mm bore tube adaptor available as an optional accessory, refer to

3.9

Connect the pump outlet

Connect the pump outlet to a suitable treatment plant to prevent the discharge of dangerous gases
and vapours to the surrounding atmosphere.
Use a catchpot to prevent the drainage of contaminated condensate back into the pump.
The exhaust system must be configured so that the maximum pressure at the pump outlet does not exceed 0.5 bar
gauge (1.5 bar absolute, 1.5 x 10
Edwards recommends fitting an oil mist filter to the pump outlet in the following circumstances:
If using the pump with the gas-ballast control open.

If operating the pump with an inlet pressure greater than 10 mbar for extended periods.

If frequently pumping down from atmospheric pressure.

The mist filter will trap the oil exhausted from the pump: the oil can be reused if it is not contaminated.
To connect the pump to outlet accessories or to the exhaust treatment plant:
Connect 15 mm internal diameter vacuum or plastic hose to the outlet nozzle

Remove the outlet nozzle and connect to the 3/4 inch BSP threaded hole.

Remove the outlet nozzle and replace it with an NW25 flange adaptor (available as an optional accessory,

refer to Section 7.5.13) and then connect to the NW25 flange.
3.10

Gas-ballast inlet connection

The position of the gas-ballast inlet is shown in
Figure 9) to trap any dust and debris if using air as the gas-ballast supply.
If using a different gas for the gas-ballast supply, or if connecting a valve to the gas-ballast inlet:
1. Remove the filters (as described in
2. Connect the gas supply or valve to the 1/4 inch BSP threaded hole.
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(Figure 1, item 6). To make this connection:
WARNING
WARNING
5
Pa) at full pump throughput.
Figure 1 (item 4). The gas-ballast inlet has several filters (shown in
Section 5.6).
Edwards and the Edwards logo are trademarks of Edwards Limited.
Section
(Figure 1, item 2).
© Edwards Limited 2014. All rights reserved.
7.5.11.