M588-00-880 Issue E
Page 38 © Edwards Limited 2015. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
For GXS450 and GXS750 dry pumping systems with the medium duty gas module there is an additional electronically-
controlled gas ballast available for harsh applications. By default, these dry pumping systems are supplied with this
additional gas ballast switched off but it can be enabled using the PDT.
Use the following procedure to enable the additional gas ballast:
1. Press the SETUP button on the PDT to enter the SETUP menu.
2. Scroll using the UP/DOWN keys and select the FIT ACCESSORY menu.
3. An access code is needed to enter the FIT ACCESSORY menu - enter 538 when prompted.
4. From the FIT ACCESSORY menu, scroll down to GAS BALLAST and then select ENTER.
5. Scroll down to 'Fitted' and press ENTER to select.
6. The additional gas ballast is now enabled.
3.14 High flow purge and solvent flush set up
For queries about solvent compatibility, contact Edwards applications specialists.
If an inert gas is used in place of atmospheric air for the DP clean purge gas, ensure it is regulated to atmospheric
pressure otherwise the DP clean process may not work properly and may cause damage to the pump.
The high flow purge and solvent flush procedures are performed by a single assembly which is supplied as an option
fitted in the factory. The actuating valve is operated pneumatically. Ensure the pneumatic gas supply meets the
specification given in Section 2.7.
Use a 3/8 inch compression fitting (not supplied) to connect the pneumatic supply to the dry pumping system. For
pump and booster combinations, the pneumatic inlet connection is on the rear pump panel, refer to Figure 3 item 10.
For pump-only systems, refer to Figure 13, item 4.
The pneumatic regulator is pre-set to 50 ± 5 psig in the factory and does not need to be adjusted. The pneumatic
regulator is shown in Figure 13, item 5 for pump-only systems. For pump and booster combination systems, the
regulator is contained within the pump enclosure.
By default the DP clean high flow purge and solvent flush assembly draws atmospheric air into the
GXS dry pumping system. If air is not compatible with the user’s process then nitrogen or another
inert gas may be used. It is the responsibility of the user to assess whether the DP clean purge gas
is compatible with the process.
Edwards only recommends use of water and diluted Loctite
®
7840 or Loctite
®
Natural Blue
®
when performing a solvent flush procedure. It is the responsibility of the user to assess whether
Loctite
®
7840/Natural Blue
®
is compatible with the application - for more information refer to the
Loctite
®
MSDS and technical data sheet. In particular the manufacturer states that Loctite
®
7840
and Loctite
®
Natural Blue
®
are not recommended for use in pure oxygen and/or oxygen rich
systems and should not be selected as a sealant for chlorine or other strong oxidizing materials.
Hot steam and liquid will exit the pump during the solvent flush procedure. Ensure that the
exhaust is piped away safely and that any solvents are disposed of in accordance with local and
national safety and environmental requirements.
To Next Page
Loading...
